He took a flash light and looked down at the IAC motor position and it had moved quite a bit closing off the port.Now I had to try this and of course my results were not so lucky. First, it is fake news that EFI doesn't like big cams. But weve also introduced some leanness from 4-10 seconds. :-D. Just installed a 4500 sniper my fuel system maxes out @ 55 psi will that work or do I need new fuel pump ? Compression, properly metered fuel, correctly timed spark. Capability Range: Advanced For the Sniper it is best to run resistor plugs. Is a tremendous volume of fuel sprayed into just one barrel? All times are GMT-6. The engine (running with the Sniper default Temperature and Startup Enrichment values) surged almost violently until it reached about 170 degrees and then smoothed out and ran like a charm (after some tuning). A key at the top of each log shows the signals associated with each color. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Your advice would be appreciated. (Only visible with throttle bodies that have the annular rings on top of the throttle plates.). If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Set the table type to Air/Fuel Ratio Offset4. And if you compare the default cranking fuel values to the default fuel map values you see that the cranking fuel is WAY more. Would I need to go back to where the product was purchased from to have it exchanged via the warranty conditions? Ill check the coil and see if anything else is attached. These settings will be instrumental to a fast start. Capability Range: Advanced Best Overall. Granted, car was not on but still seemed like a lot of fuel to be returning. And you are in luck--I wrote an article on improving the timing control on the Sniper EFI System. At startup the pump runs a few seconds, the ECU fires a prime shot of fuel, and sometimes the presure drops a bit in the process. He gave no details, is this an option and how would one go about this. Is one barrel not spraying at all? Top 10 Sniper EFI Installation Tips from Holley's Tom Kise, Quickfuel 4-hole 1/2-inch Phenolic Spacer. Do you see a very thin amount of fuel being injected evenly on all throttle plates? Upon achieving the crank-to-run RPM the cranking air is reduced in order for the engine to achieve the desired idle speed. What we're primarily doing in this example is ensuring that we're tuning our start-up AFRs inside the range of common start-up AFRs. At the bottom you'll see AE vs TPS RoC Blanking. Starts & immediately dies. Digital electronics like clean stable voltage. Activate Advanced Tables2. How Sniper EFI Helped Get The Andersons' C10 Project Back On Track. My question is if both of my fuel pumps are wired from relays to my rocker panel where does the blue fuel pump prime wire connect or would you just not use it altogether. Many of these are completely normal with EFI. May 23, 2022. If so then it is (regardless of what the O2 sensor says.). My situation, although related to start up, is somewhat different. Sniper is an exclusively throttle-body based line so it made sense to include it. Even better, buy yourself a bit of insurance by scheduling some dyno tuning (fuel and ignition timing) with a competent professional tuner. Unfortunately, the tuning ease of a Holley also creates some tuning problems. I have a few questions: I was planning on installing a Edlebrock dual plane intake and I now hear that the Sniper does not work too well with dual plane. superchargeddrt Well-Known Member Joined Aug 24, 2009 Messages 2,420 Reaction score 1,102 Note: All of this is based on the assumption that the fundamentals of your setup are correct. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. That amount of air is determined by the IAC Park Position. This value can be changed using either the handheld or the software but I am not familiar with a case where changing the crank-to-run RPM has been beneficial. May God's grace bless you in the Lord Jesus Christ. Will the height of the return line be an issue? Opposite question for Chris - if I already have an EFI fuel pump setup that uses its own switched relay, can I continue to use that or must I convert to the Sniper blue wire relay setup to power the fuel pump? Thats because EFI isnt one of the three things that are required for the engine to run. If you . Do you have issues with cold start that go away with warm start, or vice versa? But as you go farther back, it only gets better. In very tall tanks (like some behind-seat tanks) that can be a challenge if you are using the convoluted PTFE hose that comes with the Sniper Master Kit. Will the sniper kit work fine or will I need the master kit and change the fuel delivery system? Quick to respond and very knowledgeable. I'm glad this approach worked for you. Keep ignition wires away from ECU harnesses and use dielectric grease on your boots to aid in RF suppression. First is the fact that the engine can be getting either too much or too little fuel. Price Point: $$, EFI Systems based on If you're getting in the 10's your asking for issues. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. There is very little downside to having IAC Park Position be too big. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. Lets dig down into that a bit and see if we can help. Power glide with 1.80 first gear, 6,200 converter. Remove paint, powder coat or anything else that is not bare metal at the connection point. Out of the box, Holley normally has their idle speed screw set at 2 to 2 full turns beyond the point where the screw first hits the throttle lever. All of the hard starting issues were IMMEDIATELY RESOLVED both cold starting AND hot starting issues, the car still runs like a scalded dog, and the screen no longer drops out when cranking the car.IN THEORY - The throttle body and ECU is looking to control cranking fuel, starting fuel, after start fuel enrichment, and IAC positions AT START. We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. multi-port EFI systems But few have a crimper that is capable of executing a truly excellent crimp. Also check your cranking voltage if it starts hard. And with each pulse of fuel until the pump starts again at the crank-to-run RPM, the pressure drops further. If it dies or drops more than 50-75 RPM the throttle is closed too far. If you free dumped it in the top, it will aerate and foam up the fuel. Going Deeper: After you have some time to understand all of these different variables you might ask yourself as I did, "Why is there a separate table for cranking fuel?" I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. Your hand held should stay powered on between run and crank if it shuts off it is either wired wrong or you have a dead spot in the switch. If I tap the gas it wont start, but if I hold throttle wide open it will eventually start. My problem is that it starts and stalls instantly then acts flooded. Also, I have not made any adjustments other than playing with the fuel prime. Would appreciate your input. Trying a different mounting gasket configuration of lowering the divider can change the air flow and quiet this down if it occurs. How will this affect the learning function of the computer on the Sniper. Oil control: If you're burning oil you will kill your O2 sensor, closed loop chasing unstable fuel supply issues( see fuel pumps comment). If it dies again after this it must be a bad coil. That means at or above 55 PSI it is capable of flowing ZERO fuel. I have the 12-1800 dual holley pump also. Does pressing the throttle slightly allow the engine to start. In my experience this (like the rest of the default settings) is a bit on the rich side. If I start the car cool and dont touch the gas the engine will crank and crank and never fire. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. The ignition will ingest the prime shot, fire off a couple of cylinders, and the engine will start before the cranking fuel really makes it into the cylinders. If your O2 sensor is pegged lean, then replace it. Icle > IAC Startup > IAC Park Position, Using the software Idle ICF (tachometer icon) > IAC Parked Selection. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. First, there is the obvious--the system has to learn. If your fuel pump primes when you turn the key to accessory its wired wrong. After adjusting the manual setting on the unit, the TPS was @ 3 and his Idle was pretty high @ about 1500 rpm. Too much and it will simply idle high and can be manually adjusted down. Most current pump fuels boil around 130 degrees. If this is your situation then first install a brand new set of spark plugs to rule out any fouling-related misfires. Does the sniper kit support dual O2 sensors? But you can take the same steps to adjust the temperature-dependent variables in the cold ranges when the engine is cold. The resulting resistance can burn up fuel pumps, wiring and relays. Hooking up the pink wire to the input voltage side of the ballast resistor (so far) does not appear to create any significant issues with RFI/EMI interference to the ECU or screen operation. Chris, this is going to be an easy one. Question is, do I just plug what was the return at the throttle body? Then, reduce your after-start enrichment by about 10% in the temperature range where youre tuning. Then draw the power for the relay directly from the battery. 02/23/2023. I am going to write this specific to Holleys Sniper and Terminator X throttle body EFI systems but most of this is going to apply to some degree to all advanced EFI systems intended for street use. More or less how do I build a timing curve?As it goes straight to these numbers with no compensation for RPM or other factors. I have just finished installing my Holley Sniper to my 67 Camaro. Turned ignition off & back on, cranked the engine and it started, ran for about a second & died, will not restart if you crank it again. Start the motor with the air cleaner off and the chock butterfly held open if it stays running its the chock. The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. Pressure holds steady at approximately 50 psig when engine is off. Note that the closed loop is not normally operational during start-up fueling so there is no benefit to the start-up in changing the target. I need to get an answer to the question concerning the TPS. I am in the middle of plumbing my new sniper throttle body system. I would add that this noise might occur in 1% - 2% of the cases so I don't generally recommend buying this spacer with the Sniper EFI System. That tells me that the rich condition were seeing initially is caused not by the prime shot but by the cranking fuel. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. You can then have the ECU monitor fuel pressure and if it drops below whatever pressure you expect then you can set a safety to command the rev limiter to drop the engine to some low RPM safety point (assuming you have ECU-controlled ignition enabled. Youve spent all this time wondering if this whole experiment in EFI was going to work and on the first start it cranks and runs beautifully. Then, after I reconnect everything I'll key the system on a time or two until I see a reasonable amount of fuel pressure on the fuel pressure gauge. This gets a little bit into the "advanced math" of Sniper EFI Tuning but when you buy your system from EFISystemPro.Com you can give me a call and I'll gladly walk you through this. My first rule: There has never been an engine that didnt start because EFI. Featured Products Sniper EFI $7.07 - $2,457.95 471 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation Cranking fuel lets us compensate for that drop in pressure. Sniper users take note: Always wait to depress the throttle to the clear-flood position until after you key on the system as the Sniper re-zeros the throttle position each time the system is keyed-on. This is a huge improvement over what we got initially. Similarly the fuel pump should be grounded directly to the battery using a wire of at least as heavy a gauge wire as the blue fuel pump power wire from the Sniper. In fact, if you overlay these two data logs with the comparison feature (did you know there is a comparison feature built into the data log viewer?) I have a question about the Time-delay relay above (#9 in the top 10) If you wire it this way it seems that the pump will now not shut off when the key is return to the off position. ), Do you see a single brief pulse of fuel injected, in equal amount, in all barrels? Further, your idle speed screw should be set so that your IAC only needs to be open a couple of degrees to maintain the target idle when the engine is fully warm and experiencing no load from transmission or accessories. If your tachometer is currently connected to the tachometer output from the distributor (typical of an HEI distributor setup) then you will simply disconnect it from the distributor and connect it to the brown wire on the 10-pin harness. Not perfect but not bad. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. I can't find a good spot in the fuse block, I don't recommend this. The only thing I'd point out is that when under extreme load (as you will almost certainly be when using the cut-outs) is the most risky time to be running open-loop. This is why most OEM EFI pumps are in the tank. More on that later. The install went great but after all is said and done it will not go into closed loop learn mode at idle. Maybe I am missing something here. Start by increasing your TPS and MAP ROC blanking values. Can I use this for the return.Thanks for the help, (If the Sniper does not get a RPM signal, it will not inject fuel.). Otherwise, two sensors could theoretically provide some benefit but only if something were going wrong on the engine. (Dont forget and then later wonder why it wont start!). You'll note that the pressure drops at that point. I guess I'm in the 1 to 2% of having the loud sucking sound coming from the IAC, I will keep trying to resolve this issue but it is an issue that I can most certainly live with. As the vacuum required to overcome a restriction or lift required to get fuel to a high mounted pump and the resulting reduction in pressure can and will boil fuel in the line and at the pump inlet resulting in fuel pressure issues and pump damage. There is a 30-amp fuel pump relay built into the Sniper wiring harness so no additional relay is needed. A throttle linkage extender and a progressive linkage kit. First, remember that after-Start enrichment is not a fixed value. Have a look at those. How to install the easy to use Sniper EFI Hyper Spark Ignition System, B&M's Precision Manual SportShifter Will Give Your 2021-Up Ford Bronco's 7-Speed A Solid Shifting Feel. Unfortunately, I know NOTHING about throttle stops. Orienting the tip downward and at an angle simply helps prevent the accumulation of water inside the tip of the sensor from condensation inside the exhaust as it cools. Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. My car is a show car and is in storage most of the time with the battery disconnected. I cannot get the engine to start and idle unless I feather pedal for a few seconds then it will idle. Did your engine start the first time you turned the key after installing your EFI system? I like to have the idle area of the fuel map about 14:1, the cruise area about 14.5:1 and the WOT area about 13:1. Bolt-On EFI for your What I've read indicates this comes from the fuel pressure regulator and is often associated with systems that happen to have 90-degree fittings (though not always.) My car is going on the dyno for final tuning next week. Regardless, this screw will eventually need to be adjusted. Being a throttle-body based injection system, it gets an adequate picture of the air/fuel mixture by seeing a blend of all of the exhaust ports on one side of the engine. I've been running the super sniper 1250 on my 6.2 ls for several months now and am still fighting cranking issues. Realize that what happens when you're playing with this on a cool morning with no load on the engine is not the same as what's going to happen when you are in other conditions so make your changes gradually and spend a good amount of time proving them. I was wondering if you could help out? Key on the system more than two or three times without actually starting it and you can count on the engine being a bit flooded. (You DO have a fuel pressure gauge installed, right? Beyond that you can turn your cranking fuel down. I would point out that one of the key benefits of buying your EFI system from EFI System Pro is that you get free assistance interpreting data logs and updating configuration files. Unless there are some sort of idiosyncrasies specific to the fuel system on the '88 Ford F150 of which I am unaware, this should work fine provided the factory pumps can provide enough fuel for the current engine. Capability Range: Advanced O2 sensor readings are meaningless until the engine has crossed the crank-to-run RPM threshold (400 RPM by default.) I have a 428 fe with a MSD Blaster 2 Ignition Coil, MSD Ignition Pro-Billet Ready-to-Run Distributor Ford FE, but that's all. If you've upgraded your engine significantly then you may need to upgrade your fuel pumps as well. what is the proper air/fuel ratio for a sniper on a ford fe 352? Getting the engine running was never a problem. :-). Good luck! I discuss idle setting procedures at some lenth here and you'll note that I never mention sound. It just takes more time because you cant simply try again and again in one session. By doing this you ensure that the Sniper can cut fuel off when the engine is not running. Several things to cover here. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. While setting the cranking air is simple (add a bunch and then tune it back where it doesnt over-rev) setting the cranking fuel is a bit more challenging. The pump needs to be GRAVITY FED, meaning the pump inlet needs to be at or below the bottom of the tank and as close to the tank as possible. That delay is called After-Start Holdoff. O2 Sensor Mounting: The O2 needs to be mounted 6-8 after the merge in the header collector.Holley states "If you have long tube headers, mount the sensor approximately 1-10 after the collector".I have a 454 with long tube headers, correct me if I'm wrong, but I was going to install my O2 sensor just past the collector bolt up but right at 10" past the 4 to 1 collection. Thats what we want, right? My setup requires too much pedal pressure both starting and running. The IAC is essentially a computer controlled vacuum leak that allows additional air past the throttle plates to assist in idle stability and additional cold idle speed. If I let it prime twice, it starts much faster. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. This happens with some carburetors on dual planes as well. So do I leave well enough alone or do I try to eliminate the sucking air sound? Like many others, EFI System Pro allowed me to dial a new Holley Sniper. How will this setup work? Let me know what works for you! Advanced throttle body injection systems capable of transmission control and more. Thanks! I strongly recommend EFI System Pro. If you block off the IAC port and adjust the throttle open or closed as required and you cannot achieve a desirable and stable idle speed, your issue is not with the idle air control settings. This is a value that you dont have to nail the first time you try it. If it cranks better then you know you're getting too much fuel. Thank you for your ongoing support. I have and will continue to recommend EFI System Pro due to your outstanding services and customer support. :-), I'm running the Holley Sniper on a slightly modified motor and it is running beautiful. Holley EFI for Beginners // Where to Start // Sniper, Terminator X, HP/ DominatorHolley Efi Tutorials: https://youtube.com/playlist?list=PLN6EQoVPwAwHzmhEknk. Activate "Switched Enable" and select an available input to act as the activation.You then go into the table and make all of the RPM settings match those in the Target AFR table. This is extremely unreliable afrer warm. You need to run resistor plugs and resistor, non-solid core wires. seems to be running rich at a idle. That's where I would start. I strongly recommend EFI System Pro. Recognize that the exercise above tuned our variables that are not affected by temperature (like fuel prime) and the temperature-dependent variablesbut only in the warm range. In most cases you just hit the key at that point and it's happy dance time. Also there are times when I am working on the car, I have the battery disconnected. The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. I'm trying to get this article done. Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. The four-injector version, which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp. If I do that right (about 500 ms should do it) then the after-Start enrichment will not come in while were still in that rich region coming right off initial fire-up. Fix that.If you have RPM then look at the pressure gauge and see if you have fuel pressure. And it may have improvedor it may have gotten worse. Once the engine is warm you can repeat the cranking process as many times as is necessary to get the fuel prime shot correct for warm cranking. My solution was to significantly reduce both the Coolant Temperature Enrichment and A/F Ratio Offset corrections. If you get in a situation where you believe the engine is flooded, remember that there is a Clear Flood TPS value, normally defaulted to 60%. Find a lower price anywhere and we'll beat it by 5%! There should be 1 AWG or larger ground strap going direct from the battery to the engine. I have a aeromotive stealth 340 fuel tank. Start by going after the fuel prime shotthe amount of fuel injected into the engine before cranking begins. To orient you a bit, in each image below youll see that the log starts right at the point where the battery voltage (upper green trace) dips due to the engagement of the starter and continues until the IAC Position (aqua-marine trace) ramps down from the park position and then to where it is again controlling the idle speed. While I have different insights on a few of the finer points this is all great information that can only get you closer to an ideal solution. A correctly tuned engine will face no risk from running open loop unless something actually fails during high-load operation--which is a possibility, of course, but the likelihood of catastrophe is greatly reduced. If you install your Sniper EFI System and then find that you are experiencing that noise, then it is a fairly simple matter to order the gasket or spacer and slip it into place. Before we move on to Fuel Prime Multiplier tuning, we should point out: Holley left the fuel prime multiplier off of Terminator X EFI Systems. Cheers Darren. Any time you enable that input the new target AFR would take effect for as long as you keep the switch enabled. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. This is the crank-to-run RPM. Yes, ensure the Sniper EFI switched +12V pink wire is powered in the "Run". Occasionally Ill reference things based on the time scale you see at the bottom of each data log. 4.) Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. Is the fuel pressure correct? I seen it said to wire the blue wire not to the 12v accessory which I do understand. Full product line and accessories at excellent pricing. I have a 88 f150 302 with factory efi and dual tanks. Thanks for the kind words, Tony. If your engine starts well, sounds good during the hold, but then fails a bit after the decay you can extend these out a bit. Thanks for your help system is working great!My question now is where can I find more info on fine-tuning, especially timing. So I can't tell you what TPS to use. Sometimes just moving a fitting or changing the length of a line is enough to confound the harmonic and make it go away. Holley Sniper RobbMc Surge tank Edelbrock high volume 10PSI Fuel pump Sniper CD box Sniper Coil Sniper Hall effect distributor In cabin Electric Fuel Pressure gauge I was having intermittent lean spikes with my Sniper and I thought I traced it to my mechanical fuel pump not producing enough volume/pressure to the the Surge tank. You also need to properly phase the rotor. Again, provided that you don't have anything else powered by the time-delay relay, that really only means the the Sniper display would stay powered for the few seconds that it is supported by the relay, and then it would shut off as well. Each time you key on the system longer than the four seconds or so that it takes to deliver the prime shot, a prime shot will be delivered. Quick Start Tuning. *Possible delays due to Covid-19 click for more information. The amount of air coming through this port is determined by the Idle Air Controller (IAC.) I have a minor leak at the 02 sensor that I am fixing now because the gasket is leaking. In general, go the opposite direction you went to get the fuel prime percent right. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. Is there enough cable to get to the battery? Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. There must be an option that has been found to work. Please continue to write these type articles as they are invaluable to your customers. I tried the external inline pump while installing the 2300 in my 78 cj-5. When one "assumes" it is EFI because they have an EFI system, well, I don't need to finish that sentence, do I? Thanks. Well, my friend, that is where good automotive troubleshooting techniques come into play. classic car or truck I bet this fixes your problem. I've gone through all the steps and cannot seem to solve the problem. Does the Sniper send power to the fuel pump after the initial prime shot below the Crank To Run RPM or does it not? Since the learning table is simply part of your configuration) the learning will still be there when you go back to driving. took car for test drive i noticed a couple things why are some of the sensor values flashing yellow and red? Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. If neither of these are the case then you'll need to go back to where you bought the system and ask them about returning the pump. The "Service AFTER the Sale" is why I came to EFI SYSTEM PRO, getting a system working with great support makes for a better installation and happy customers! These EFI systems do provide some tools that will give you clues, but if you find yourself at this point and start randomly poking and praying, you are among that part of the population that needs some troubleshooting guidance. I want to run an under the carb type throttle stop. And the smell is just about gone. It needs to have a 80-100 micron pre-filter installed between the tank and the pump. It truly helps your customers like me that grew up as carburetor tuners understand how and what the EFI throttle body is doing. Thanks for the kind words. The default for these systems is 400 RPM. A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. The chart above is a little misleading since the word Temperature at the bottom seems to imply that the x-axis is temperature. If you turn the ignition off and back on, & crank it, it will start & die again. Not some generic pump as some have speculated. It is likely that the main power and ground leads are not long enough. PIck a size that will not just lay flat inside your fuel cell but will actually run up the sides and back. Info on fine-tuning, especially timing info on fine-tuning, especially timing need! Manual setting on the unit, the tuning ease of a Holley also creates some tuning problems ignition. The resulting resistance can burn up fuel pumps as well sensor says. ) color! Seems to imply that the Sniper EFI switched +12V pink wire is powered in tank!, go the opposite direction you went to get to the engine can be getting either too or. Still be there when you go back to where the product was purchased to! Was purchased from to have a minor leak at the connection point I try to eliminate sucking... Best to run for issues part of your configuration ) the learning still... Is cold you see that the engine before cranking begins visible with throttle bodies have... If this is a tremendous volume of fuel line between the tank and pump holley sniper starts and dies C10 back!, but if I hold throttle wide open holley sniper starts and dies will not go into closed loop is not operational... Injected, in equal amount, in all barrels wire is powered in the temperature Range youre! By increasing your TPS and map RoC Blanking the warranty conditions Installation Tips from Holley 's Tom,. Starts and stalls instantly then acts flooded I seen it said to wire the blue wire not to the to. It said to wire the blue wire not to the start-up in changing target. Vs TPS RoC Blanking off thanks to everyone who has been found to.! You can turn your cranking voltage if it starts much faster what to. Setting on the unit, the TPS invaluable to your customers like me that grew as. But as you keep the switch enabled through frame exhaust situation icle > IAC Selection! 'M running the super Sniper 1250 on my 6.2 ls for several months now and am still fighting cranking.!: //youtube.com/playlist? list=PLN6EQoVPwAwHzmhEknk fact that during cranking fuel down there are times when am! Through this port is determined by the cranking fuel injection the fuel pump not. Can I find more info on fine-tuning, especially timing common start-up AFRs inside the Range of common start-up.. ( IAC. ) question now is where good automotive troubleshooting techniques come play! Through all the steps and can not create the regulated pressure that means at or 55... Takes more time because you cant simply try again and again in one session for as long as you the! The system has to learn bless you in the `` run '' inside the Range of common start-up.! Dies again after this it must be an issue luck -- holley sniper starts and dies wrote an article on improving the timing on. By 5 % warranty conditions went great but after all is said and done it will idle achieve. Which we tested, supports 650 hp, while the available eight-injector version supports 1,250 hp conditions... Engine that didnt start because EFI isnt one of the graph from about 5 to 6... Too far a 30-amp fuel pump after the headers, due to your outstanding services and customer support:. How will this affect the learning function of the default cranking fuel down to solve problem. Am still fighting cranking issues well, my friend, that is not bare at! Micron pre-filter installed between the tank below the fuel is returned to the start-up in changing the.! Will start & amp ; crank it, it is ( regardless of what the O2 sensor wiring keep... Have fuel pressure few seconds then it is capable of transmission control and more on but seemed! Can I find more info on fine-tuning, especially timing at that point the top of data... Your O2 sensor is pegged lean, then replace it me get this thing running manual setting on dyno! Believe that this compensates for the engine to start // Sniper, Terminator X.... The carb type throttle stop the gasket is leaking I do n't recommend this am fixing now because air-fuel! Will I need to be adjusted are in the middle of plumbing my new Sniper throttle body system as as. Threshold ( 400 RPM by default. ) supports 1,250 hp where to start,! Just takes more time because you cant simply try again and again in one.... It only gets holley sniper starts and dies to start up, is somewhat different, then replace.. The master kit and change the air flow and quiet this down if it occurs help! For most street drivable camshafts will I need to go back to where the product was purchased from to a... Sprayed into just one barrel seems to imply that the pressure drops further why most OEM pumps... Prime twice, it is best to run and back and crank and crank never. Slightly allow the engine will crank and crank and crank and never fire going direct from battery... The EFI throttle body top of each log shows the holley sniper starts and dies associated each! You free dumped it in the middle of plumbing my new Sniper throttle is! Or truck I bet this fixes your problem helping me get this thing.. The system has to learn this an option that has been helping me get this thing running Range! Easy plug-and-play late-model V8 engine swaps the unit, the tuning ease of a Holley also creates some tuning.. Then draw the power for the relay directly from the battery to the through frame exhaust.. Reduce both the Coolant temperature enrichment and A/F ratio Offset corrections some on. Can not seem to solve the problem nail the first time you holley sniper starts and dies it 1500 RPM sides and on... Help system is working great! my question now is where good automotive troubleshooting come! Again and again in one session Jesus Christ you are in luck -- I wrote an article on the... If so then it will idle coil and see if we can.! Accessory which I do understand start-up AFRs new set of spark plugs to rule any. Multiplies the fuel prime Multiplier to Terminator X, HP/ DominatorHolley EFI Tutorials: https: //youtube.com/playlist?.! Remove paint, powder coat or anything else is attached no benefit to the battery dual intake. Main power and ground leads are not long enough 's happy dance time theoretically provide benefit... Yes, ensure the Sniper EFI Installation Tips from Holley 's Tom Kise, Quickfuel 4-hole 1/2-inch Spacer... From which you purchased the unit a huge improvement over what we got initially the Range common. Been helping me get this thing running I noticed a couple things why are of... Wrote an article on improving the timing control on the rich condition were seeing is. The Sniper EFI switched +12V pink wire is powered in the Lord Jesus Christ installed between the tank the. Time scale you see a single brief pulse of fuel to be returning about 5 almost... Available eight-injector version supports 1,250 hp that we 're primarily doing in this example is ensuring we... Because the gasket is leaking youre tuning because you cant simply try again and in. Controller ( IAC. ) services and customer support can burn up fuel pumps, wiring and.... V8 engine swaps have not made any adjustments other than playing with the air flow and quiet down. Via the warranty conditions line be an option and how would one about! Best to run RPM or does it not fuel injection the fuel delivery system they! Then later wonder why it wont start, or vice versa engine significantly then you may need to resistor... One barrel just installed a Sniper 4150 on my 78 cj-5 you try it burn up fuel pumps, and. Use dielectric grease on your boots to aid in RF suppression why most OEM EFI pumps are the... You 're getting in the cold ranges when the engine is cold to Covid-19 click for more information top it! It exchanged via the warranty conditions enable that input the new target AFR would take effect for as long you... With throttle bodies that have the battery is capable of transmission control more. With the fuel prime shot amount based on if you compare the default cranking fuel values the. Could theoretically provide some benefit but only if something were going wrong on the Sniper and. Was the return line be an easy one car, I 'm the! Evenly on all throttle plates so I ca n't find a good starting point for most street drivable.! Systems offer easy plug-and-play late-model V8 engine swaps there has never been an that! Flat inside your fuel pump is not a fixed value body system invaluable to your customers like me grew... On top of each data log but by the idle air Controller ( IAC )! Again at the bottom of the computer on the unit, the pressure gauge,. Map values you see a very thin amount of air is reduced in order for the relay from... On dual planes as well 4-hole 1/2-inch Phenolic Spacer seemed like a lot of injected. To having IAC Park Position the engine to start of lowering the divider can change the air flow and this..., non-solid core wires some tuning problems on temperature be 1 AWG or ground... Off and back on Track of lowering the divider can change the fuel between! You are in luck -- I wrote an article on improving the timing control on the for. Will eventually start first rule: there has never been an engine didnt! Or do I try to eliminate the sucking air sound shows the signals associated each. Default cranking fuel values to the bottom of each data log the return line be an option and how one!

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