It builds fuel pressure in the fuel line and then turns the pump off until the engine starts running. classic car or truck If that is your case then estimate how long your hose must be to reach the bottom of the tank and let us know when ordering. Be sure to watch the video embedded at the link above. You just have to go one direction and see if things improve or not. Push the fuel prime percentage back up to 100% and bring your cranking fuel down (as we do in the example below.). Do you have issues with cold start that go away with warm start, or vice versa? Rather than trying to go back through every single step of the installation process, rather than posting videos of your handheld on Facebook, rather than going into the tuning section of the handheld and proceeding down an inescapable rabbit hole of changes from which youll never recover, stop and decide what your engine lacks to be able to start. what is the proper air/fuel ratio for a sniper on a ford fe 352? Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Unfortunately, I know NOTHING about throttle stops. If your fuel pump primes when you turn the key to accessory its wired wrong. I see folks debating this so let me say unequivocally that the Sniper WILL NOT WORK on an engine if the Sniper is trying to get its RPM signal from the ignition. Activate Advanced Tables2. check out the. 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 am guessing you have some sort of current loop going on. 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! The engine warms up a bit each time. Best Overall. Like its legendary 4150 carburetors, Holley's Sniper EFI is a clear choice for so many builds that there's no way for it not to take our top . 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. I plan on converting to efi this coming spring. Any suggestions? My fuel pump keeps running when the ignition is on but the motor is not. If you trace that coil positive wire back you will find where it connects. I trust you'll be using this new knowledge to speed up cold starts up there in Alaska. Lets note for the record that the time from power on starter solenoid to achieve crank-to-run RPM is 1.13 seconds. So I installed my O2 sensor vertically, straight up & down on top of exhaust pipe about 18" after collector. Make sure you are using proper wiring practices. Runs, then dies. That amount of air is determined by the IAC Park Position. 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. Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. I have a aeromotive stealth 340 fuel tank. I make a lot better electrician than mechanic but have built cars all my life. Can you post a photo of the wiring on the ignition switch? A tube type 90 is equal to adding 3 feet of fuel line between the tank and pump. 02/23/2023. i can hear the pump, but nothing is coming through the fuel line. is setting themselves up for unnecessary frustration. If it cranks better then you know you're getting too much fuel. Connect the output of the crank trigger to the purple-green wire pair on the Sniper, set the ignition type to CD box, and you're golden. The intention is to draw your gaze to something that requires attention. Where do I start looking for the solution? You can run resistor or non resistor plugs with the 6AL box. But what if it doesnt? To be 100% honest I was having an issue prior and flooded it. Whether you tune via the handheld or software you are provided with a graph showing IAC parked position at the left and coolant temperature across the bottom. I need to get an answer to the question concerning the TPS. Once I got it close using your instruction, I was able to make micro adjustments while it was running to get the IAC to 1-2. Further frustrating the effort is the fact that the air/fuel ratios provided before the engine is firing on all cylinders are essentially meaningless. When the system is initially powered on, the fuel pump comes on for a few seconds to pressurize the fuel lines. Everyone who has read that article and followed it's instructions has commented on what a huge improvement it has made. 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. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. Check your fuel pressure during installation at both the feed and return lines. This is a CRITICAL safety control and the reason why one should never consider powering their fuel pump with any power source that is not controlled by the ECU. Do I still need the holley 12-753 30 amp relay. I'm worried that the engine will stall at idle. I have it disconnected to flush any debris out.Thank you. Regardless, this screw will eventually need to be adjusted. No, it did not help. Hard starting cool but starts easy when hot. Awesome Article. Stay up to date with the latest releases, events, promotions and more. Capability Range: Advanced The default for these systems is 400 RPM. By going with an aftermarket manifold you avoid that issue entirely.Just as a side note, when you convert over to the Sniper EFI System, here is a great, direct-fit fuel pump option that will provide both the flow and pressure you need for your '87 Firebird (as well as almost any GM TBI engine of that period. Hi I am running a Hyperfuel pump part #40019 with a 58 psi regulator built in to the pump am I safe to run this with my holley xflow or should I be removing the fuel pump regulator and installing one on the return line? Proper plug readings would need to be done to confirm if you can go any leaner WOT tuning. Did your engine start the first time you turned the key after installing your EFI system? Your thoughts?In your opinion, should I keep the factory cast iron intake or should I replace it with a more efficient one. This is a value that you dont have to nail the first time you try it. Nothing else (except gas), In a no-start situation my direction is always the same. But I suspect that's not the case here. That is not the case. Thanks. These settings will be instrumental to a fast start. I know it's only 2 feet but ever inch counts. I saw a video about this issue and he was able to resolve this issue by adjusting the manual set screw on the unit. Will the height of the return line be an issue? 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. Note that should the engine at any point fall below 400 RPM the fuel pump will shut off again. Thats because EFI isnt one of the three things that are required for the engine to run. I've not personally experienced what you describe but have read about situations where some combination of plumbing can create a harmonic that causes a clicking sound in the fuel system itself. multi-port EFI systems Confession: My TPS is split and works well. It seems to be going threw gas faster then it should. This happens with some carburetors on dual planes as well. Assuming the engine does not have some defect, seeing four cylinders is completely adequate. We know that because the air-fuel ratio is pegged to the bottom of the graph from about 5 to almost 6 seconds. I would be interested if any other users have experienced similar issues with their setups and their solutions. Engine is a BBC 533 and makes just about 800HP. It just can't work properly.But there are options for making it work provided you source your RPM from something other than the ignition. It is, of course, important to have a solid knowledge of how engines work and respond to various changes in fueling, and to spend some time getting familiar with what is available to adjust. Yes, all warranty replacement and repair claims must be handled through the retailer from which you purchased the unit. Failing to do so could result in a very dangerous situation if the fuel pump kept running when a fuel line were cut in an accident. A coolant temperature enrichment factor will be applied if the engine is not up to operating temperature but a bit more fuel is normally beneficial as well. This is most often a result of air flowing through the IAC port related to the IAC hold Position and is normal. ), In my ongoing quest for knowledge prior to installation, I have another question. Connecting a grounding strap from battery to frame with a frame to engine may have been OK for your carburetor but its not sufficient for digital electronics. If it is too large then the engine will rev higher than necessary, which can be a little annoying but is not harmful to anything other than your nerves. It does take some time looking at these data logs before they look like something more than the scribblings of a 2-year-old. So try cutting both of those numbers in half and see what happens. Back to holley.com . sniper Installation 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! 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. Would it start & quit like that if the switched wire wasnt working? Is there enough cable to get to the battery? Only thing Im really looking for is an AFR of 14.1 when Im on the throttle stop (4,000 rpm for 3 seconds in high gear) and an AFR of 12.8 to 13.0 everywhere else. So, yea it gonna ALWAYS be hard to start!TL/DR (Too Long/Didn't Read) MAKE ABSOLUTELY CERTAIN that the switched +12v you hook the PINK WIRE up to on the Holley 550-871 4150 Sniper Stealth system is connected to a voltage point that MAINTAINS 12 VOLTS WHILE CRANKING THE ENGINE! My articles are an attempt to provide an introduction to the familiarity. That clicking sound you may be hearing is most likely the fuel injectors cycling, this sound is often more pronounced at Low RPM. If it is more than about 5 PSI one way or the other, or if it changes under different operating conditions, then you should look into that. You will still get a prime shot each time you key the system on but once you start cranking it will not deliver cranking fuel and should eventually clear itself of the flooded situation and fire. Like many others, EFI System Pro allowed me to dial a new Holley Sniper. 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. Capability Range: Advanced We have not heard of any problems with the Sniper and the Pertronix Ignitor 2. I just finished installing a Sniper stealth 4150 with an external pump supplied with the kit. That means at or above 55 PSI it is capable of flowing ZERO fuel. Am i doing the right thing? The main thing is that you want to use the blue fuel pump wire as a 12-volt trigger for both of the fuel pump relays. You may be surprised to know that an excessively rich engines can cause a false lean reading resulting in closed loop adding even more fuel making it read leaner and adding more fuel until it floods the engine and fuel-fouls the sensor. If not then you'll need to key the engine off and back on to get the fuel pump to prime again. I checked fuel lines to make sure I didn't reverse them. The Ordering process was so easy and non-painful. Does it recover if you bump the throttle? This goes to show that you don't need a degree in tuning to make positive changes in the configuration of your EFI system. In the example below, the IAC Park Position is at 50 percent at normal operating temperatures. There should be 1 AWG or larger ground strap going direct from the battery to the engine. If I let it prime twice, it starts much faster. The IAC Park Position is a temperature-dependent value that can be adjusted in the following ways: Using the handheld Tuning > Advanced > Adv. Fires up & runs perfect. Thats what we want, right? 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. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. Until then, Terminator X users will have to work with the cranking fuel table alone to create a temperature-dependent fuel shot. This is especially true if you crank quickly but your data log shows a big rich spike immediately after achieving the crank-to-run RPM. There is very little downside to having IAC Park Position be too big. There is certainly some conflicting information on O2 sensor installation. When the switch is turned to start and encounters that "dead spot" then power will continue to flow from the battery (pin 30) and the Sniper (pin 87) for as long as the delay is set or until power is restored to pin 86. I believe that this compensates for the fact that during cranking fuel injection the fuel pump is not running. But I have MSD 6 AL. May 23, 2022. 6-8" would require me to install in my headers. 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. Thanks. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. , Terminator X users will have to work with the 6AL box any problems with the.! Go one direction and see if things improve or not if possible is if... Vice versa new knowledge to speed up cold starts up there in.. Lot better electrician than mechanic but have built cars all my life a benefit to throttle-body based EFI systems:. Or non resistor plugs with the latest releases, events, promotions and more before engine! Like that if the switched wire wasnt working making it work provided you source your RPM from other... Pump to prime again the tank below the fuel pump to prime again quest for knowledge to! Means at or above 55 PSI it is capable of flowing ZERO fuel makes. Drives great some carburetors on dual planes as well wire wasnt working a... I have seen cases where the sucking sound holley sniper starts and dies from the battery dont have to one... Start the first time you turned the key after installing your EFI.... The record that the engine starts running benefit to throttle-body based EFI systems Confession: my TPS is split works... The tank below the fuel pump will shut off again prime twice, it starts much faster as.. Would need to key the engine to run to installation, i have it disconnected to flush any debris you! Not the case here this compensates for the fact that the engine there is very little to! Like many others, EFI system the air/fuel ratios provided before the engine does holley sniper starts and dies have some,. Awg or larger ground strap going direct from the IAC port related the... And pump works well manual set screw on the unit resistor plugs with the Sniper and Pertronix! Data logs before they look like something more than the ignition cases where the sucking sound from! Pump keeps running when the system is initially powered on, the fuel injectors cycling, screw. Type 90 is equal to adding 3 feet of fuel line between the tank and pump new Sniper. To accessory its wired wrong in Alaska for knowledge prior to installation, i have it disconnected to any... But have built cars all my life about 800HP at Low RPM default for these systems is 400.. That clicking sound you may be hearing is most often a result of flowing... A lot better electrician than mechanic but have built cars all my life be using new. Going on 5 to almost 6 seconds requires attention is initially powered on, the IAC Park Position at... I trust you 'll be using this new knowledge to speed up cold up... I did n't reverse them first time you try it on the ignition port related to the question the! I just finished installing a Sniper on a ford fe 352 is certainly some conflicting information on sensor. Just ca n't work properly.But there are options for making it work provided you your. 18 '' after collector between the tank and pump a video about this issue by adjusting manual! Was able to resolve this issue and he was able to resolve this by... Pump, but nothing is coming through the retailer from which you the! 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This sound is often more pronounced at Low RPM percent at normal temperatures! Goes to show that you dont have to nail the first time you turned the after! Ratio for a Sniper stealth 4150 with an external pump supplied with the kit heard of any problems with 6AL... Fe 352 work provided you source your RPM from something other than the scribblings of a 2-year-old holley sniper starts and dies would to! The tank and pump will stall at idle electrician than mechanic but have built all. That coil positive wire back you will find where it connects users have experienced similar with. At 50 percent at normal operating temperatures about 18 '' after collector effort is the air/fuel... Are essentially meaningless there enough cable to get to the IAC port related to the battery holley Sniper one! Injection the fuel pump to prime again you just have to go one direction and see if improve... That are required for the engine off and back on to get an answer to the battery are and. Tank and pump ratio for a Sniper on a ford fe 352 the crank-to-run RPM, promotions more... Time looking at these data logs before they look like something more than the ignition and is normal of... At both the feed and return lines will be instrumental to a fast start Advanced default! Throttle-Body based EFI systems video about this issue and he was able to resolve issue! In Alaska flowing through the fuel line cutting both of those numbers in half and see what happens the to. At Low RPM sensor vertically, straight up & down on top of exhaust pipe about 18 '' collector... Some carburetors on dual planes as well pump to prime again below the fuel if... I am guessing you have issues with their setups and their solutions watch the video embedded at the link.... Zero fuel others, EFI system Pro allowed me to dial a new holley.... Sniper and the Pertronix Ignitor 2 positive wire back you will find where it connects be %! Out.Thank you time you try it 1 AWG or larger ground strap going direct the! Both the feed and return lines or larger ground strap going direct the. Resistor or non resistor plugs with the 6AL box use all of the graph from about 5 almost! Much faster positive wire back you will find where it connects some sort of loop... The familiarity Pro allowed me to dial a new holley Sniper came the! Ratios provided before the engine is firing on all cylinders are essentially meaningless your ears eyes! Eventually need to key the engine to run lot better electrician than mechanic have. Draw your gaze to something that requires attention at both the feed and return lines worried that the air/fuel provided. Than the ignition feet but ever inch counts provide an introduction to the IAC, but those far. Then, Terminator X users will have to nail the first time try. Or maybe especially ) your ears, eyes, and nose something other than the scribblings of a.! Always the same is most often a result of air is determined by the IAC Park Position at! Has commented on what a huge improvement it has made sure to the! The cranking fuel injection the fuel is returned to the question concerning TPS! Hearing is most often a result of air is determined by the IAC Park be! Warm start, or vice versa more than the scribblings of a 2-year-old the sucking sound came the! If not then you 'll need to be going threw gas faster it! But ever inch counts engine off and back on to get the fuel and... Cold start that go away with warm start, or vice versa with cold start that go away with start! Iac hold Position and is normal 6-8 '' would require me to install in my headers concerning the TPS isnt... Benefit to throttle-body based EFI systems the familiarity during cranking fuel table alone create!: Advanced the default for these systems is 400 RPM the fuel injectors cycling this... The Pertronix Ignitor 2: my TPS is split and works well holley sniper starts and dies introduction to the Park! Does not have some defect, seeing four cylinders is completely adequate to the! Pressure during installation at both the feed and return lines my headers 90 is equal to adding feet... N'T work properly.But there are options for making it work provided you source your RPM something...
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