It will come back up when the engine is running.If you have fuel pressure then you've got to dig deeper. Can I get ready made tunes?Even with this problem it is by far the best fuel system I have owned. Thank You for helping me out with my EFI system purchase during these trying times of COVID-19. Holley Technical Training Manager Tom Kise recently published a list of ten "suggestions" for Sniper EFI System installation and I offer them here essentially unedited. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Power glide with 1.80 first gear, 6,200 converter. How will this setup work? If you do not disable it you will fight startup issues, flood the engine and damage your O2 sensor. There should definitely be no power to the fuel pump from the fuel pump relay until the crank-to-run RPM is reached. Even if you don't let the engine get warm you will have changed the starting characteristics by making a start so you'll need to wait for the engine to get back to a fully cold/dry state before you can data log another start and measure the effectiveness of it.But you already have a pretty good clue that you need more fuel if two prime shots make it easier to start. I would add a 12v-switched relay to power your Sniper. I just installed a Sniper 4150 on my 78 Monte Carlo with a stock 305 and a dual plane intake. At -40 degrees it multiplies it by the full indicated amount (five times, by default.) Runs, then dies. So if the +12 Volts "goes away" during the crucial start cycle the EFI ECU is essentially "Brain Dead" seemingly at this point. multi-port EFI systems FE 390 that currently has a Pertronix distributor with the Ignitor 2 module. The Sniper EFI System will absolutely work fine in your rock crawler, Todd. Alternatively, the regulator can be removed and then what was a return can now be used as another feed. Not some generic pump as some have speculated. Then, realize that you have the ability to delay the point at which the enrichment starts by up to one second. 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. If, after starting, the engine speed drops below the crank-to-run speed it turns the fuel pump off again. (Plus, it's easy to do---see this article.) It seems to be going threw gas faster then it should. Try cranking immediately upon key-on--before it has a chance to prime. 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 strongly recommend EFI System Pro. Clicking, ticking and sucking sounds. Couple this with a fuel cell that is built for rock crawling and I don't think you will find any situation where you can't get fuel to the Sniper EFI System. Direct to the battery means to the battery. You just have to go one direction and see if things improve or not. Everyone raving about customer service is telling the truth! Just make sure you do not have a vacuum leak between the TBI and the intake as this will result in a multitude of idle and drivability issues. Unfortunately, I know NOTHING about throttle stops. Because all it knows is the specified system pressure, which doesn't exist at this point. These settings will be instrumental to a fast start. We offer several different levels of fee-based support that is very reasonably priced. You write: "The fuel prime multiplier multiplies the fuel prime shot amount based on temperature. Turn your prime shot down (I think I run about 75% and NEVER let it fire its prime shot when the engine is warm. "I've edited the article with a note about the difference. Price Point: $$$. Why? Default values on these are 150% and 5, respectively. Advanced throttle body injection systems capable of transmission control and more. 4-hole spacers seem to work better than open spacers. There should be no relay added to this wire. 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 have fuel pressure? But never ever forget there is a second learning going on--your own. Ran well on carb and electronic ignition. In the software, click the IAC Settings button (immediately above the IAC Parked button on the left-hand navigation panel) and look in the section called Startup IAC Position. Good luck! But few have a crimper that is capable of executing a truly excellent crimp. Lets go back to 100% fuel prime and turn cranking fuel down in that region by 30% and see how that affects us. I suspect this is the case in a huge number of "problematic" EFI installations where the system is getting the blame. Get this high enough that it is not limiting the ability of the engine to start, tune the other factors that enhance the engines ability to fire quickly, and then come back and trim this back so that it doesnt over-do the initial rev-up. If you are running a fuel cell with two ports in the sump, do not run the return into the port parallel to the feed. *Possible delays due to Covid-19 click for more information. transmission control and more. If I go to ignition switch it is the same wire just 2 away. Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! The x-axis is time, but it is true that the volume of both after-start and coolant enrichment is determined based on temperature (and certainly that temperature will increase as the engine runs, eventually eliminating any coolant modifier/enrichment.) The intention is to draw your gaze to something that requires attention. Im not looking for timing control just upgrade to EFI. As Tom says above, it is best if the fuel is returned to the tank below the fuel line if possible. 1964 Chevy Nova, 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide Transmission. features . 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. Already have a new sending unit for gauge, on the fence whether to add in tank or external fuel pump. One thing didn't make sense to me. While it is usually possible to install the Sniper EFI System on an aftermarket intake with the Quadrajet footprint, very often the factory Quadrajet intakes will require an adapter for the Sniper throttle body to seal properly. Also, if you have the IAC inlet plugged off and the throttle angle is set to your desired idle speed and it dies when you put it in gear with an automatic. Im installing a sniper on a 49 Ford f1 with a 302 and still have the original behind the seat tank. My car is going on the dyno for final tuning next week. The majority of the idle air is going to come past the throttle plates, held slightly open by the idle air screw. Chris, this is going to be an easy one. I have purchased two sniper EFI with the MSD distributor kit. I would also point out that these settings are easier to adjust using the Sniper Software than the handheld, though either will work.There are several settings that affect how quickly the idle returns to target. Is the spark occurring at roughly the advance we expect it to be to promote ignition? You'll note that the pressure drops at that point. Last time it ran was last week and it ran fine but I believe I ran out of gas or was close to running out of gas while idling in my driveway. 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.) Capability Range: Professional Yes, I have seen cases where the sucking sound came from the IAC, but those are far and away in the minority. Several things to cover here. Words only go so far so I thought Id include a tuning session to give you some idea of whats going on here. Start by first cutting the fuel prime to 100% and taking about 20% out of the cranking fuel in the temperature range of the engine. If not, then the orientation of your O2 sensor is not your problem. Use all of the tools at your disposal including (or maybe especially) your ears, eyes, and nose. All of these values are configurable. The A/F Ratio starts at -1.0 and decays to zero at 140 degrees. To be 100% honest I was having an issue prior and flooded it. If I let it prime twice, it starts much faster. This is called the fuel prime shot. At this point you should be able to start the engine consistently though the cranking times may be longer than you want. Only thing I have done since last Wednesday was add Holley EFI gauges. Presumably 60 degrees is the temperature at which the prime shot multiplier is deployed at half of the indicated amount.). Have you ever watched a post nuclear apocalypse movie? 2-Barrel Sniper EFI 2300 Sniper EFI C10. Most current pump fuels boil around 130 degrees. FSM Manuals Jeep Manuals. 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. Use whatever target AFR the system is initially suggesting and try to get your actual AFR's within about 1 to 1.5 of that value. 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. Yeah, I have the pink wire wired through a toggle switch straight to the battery. Actually, as long as you are driving the fuel pump with the blue wire from the Sniper EFI System it will shut that down as soon as the RPM drops below the crank-to-run RPM (400 RPM by default.) That should give you a relatively clean 12-volt switched power source for the Sniper. I could really go on a long time about this but it sort of deviates from the basic goal of this article. 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. That's what the fuel prime is all about. Do you have issues with cold start that go away with warm start, or vice versa? 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. ), I have the sniper efi system with the holley retro-fit in tank electric fuel pump. However, I keep an AN -6 Male-Male union in my "go bag" and when I do an installation I'll generally connect the feed line to the return line right there behind the throttle body, jumper the fuel pump relay, and let it run 20-30 seconds. May God's grace bless you in the Lord Jesus Christ. I have a relatively restrictive 2 " exhaust after the headers, due to the through frame exhaust situation. If the pump has a restricted feed or is mounted above fuel level and has to lift fuel you Will damage the pump do to cavitation. At the bottom you'll see AE vs TPS RoC Blanking. You can adjust your Fuel Prime Multiplier on Sniper EFI Systems as follows: Using the Handheld Tuning > Basic > Basic Fuel > Fuel Prime > Fuel Prime Multiplier, Using the Software Fuel ICF (Fuel Injector Icon) > Startup Enrichment > Fuel Prime Multiplier (under the Cranking Fuel tab in the box marked STARTUP SETTINGS). Good luck! Many of these are completely normal with EFI. I did not, but as I was checking flow at regulator side, it was a large steady flow of fuel coming from regulator. You mentioned its use in # 9 of the top 10 Sniper EFI installation tips. For some reason the default on the Sniper Quadrajet is a ridiculous 5 and 7 while it is 15 on the other Sniper's. No, it did not help. You may have a pinched injector signal wire that has the injector on permanently. Sure enough the pink wire DID NOT have voltage when cranking. They are the only ones got me a holley usb to can cable fast. Holley Sniper EFI--Look, No ECU or Wiring Harness! 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. 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. *Possible delays due to Covid-19 click for more information. Bill Tichenor. If that happens it will be obvious as it will usually catastrophically impact the sensor, destroying it and sending the reading to a permanent full-lean conditions. Who reads instructions completely with 30+ years of working on cars, RIGHT?THE TELL - When CRANKING the car to start it, does your screen drop out to black, then once you unsuccessfully or successfully (Depending on your luck of the car gods that day) let the key off the start position to run position, does it appear to "boot" as if you just turned the key to the on position? This is a huge improvement over what we got initially. Idle and cruise can be tuned leaner with "seat of the pants" feel. What is important is that you understand what happens at this point. No timing control. Additional fuel is injected during cranking is simply called cranking fuel. 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. If youre OCD you could go on forever but this is going to work well for anyone. Anouther cause may be the proximity of a dual plane intakes plenum divider to vacuum passages under the throttle body resulting in an odd sucking or whistling sound. Make sure the fuel pump is properly mounted and picking up fuel. The resulting O2 sensor failure is damaged not defective. Price Point: $$, Robust, feature-rich The sniper master kits ship with OEM grade 255 LPH Walbro Pumps. Sniper is an exclusively throttle-body based line so it made sense to include it. Or do as I do? check out the. A throttle linkage extender and a progressive linkage kit. Unfortunately, the only way to do this is with the Sniper Software. The fuel pump should be powered by the heavy-gauge blue wire coming from the Sniper EFI System. My setup requires too much pedal pressure both starting and running. You can use that for the Dual-Sync and ignition too when you get to that point.Running the O2 sensor on a single side of the dual exhaust works fine. Does it recover if you bump the throttle? 4.56 rear gear and total weight is 2825 with me. Pinched or Burnt O2 sensor Wiring: Keep it high, tight, and safe. Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11 fans 4400 cfm up from twin 10 at 3500 cfm. The engine warms up a bit each time. Any time that a fuel pump cannot create the regulated pressure that means it's not flowing enough fuel. How will this affect the learning function of the computer on the Sniper. (If the Sniper does not get a RPM signal, it will not inject fuel.). 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. So here's how I'd do it:Pin 86: To your ignition switch (12 volts) Do you see an issue with this? The strong exhaust smell during this time indicated a very rich condition. 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. I also have dual sync distributor and same accel super stock 8140 coil to run as soon as i work all bugs out of FI conversion. I have had my Sniper system running for 2 years now and often tell people it's the best money I have ever spent. Yes, there should be a steady flow of fuel out of the return. We offer two potential solutions. In a you tube video I watched , the presentaor indicated that the return fuel line could be routed to the filler neck ( of the tank ). That is sort of a long shot but more-and-more I have folks give that a try because sometimes it corrects mystery problems that don't have any other explanation. If you are going to be working on something that will require you to key the system on several times without starting the engine, you might want to consider removing the fuel pump relay found in the harness. We do see a massive rich dip in the AFR as soon as engine starts. 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. EMI is what wipes out all the electronics. That helped. Anytime the built-in Sniper fuel pressure regulator is not used the return can simply be plugged. This is most easily done using the blue fuel pump wire. However, I went to turn my pick up on today and it wouldn't start, just turned over. But as you go farther back, it only gets better. This first data log shows a startup using the default settings on a Terminator X Stealth. If the engine starts but is extremely rough-running were still in the guessing stage because misfires are going to cause the AFR to read lean. If you free dumped it in the top, it will aerate and foam up the fuel. 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. You might want to try changing around the plumbing a little bit and see if that helps. offer easy plug-and-play Go Gators. Ill increase the after-Start enrichment fuel by about 10% in the temperature range where were working. So only crank and ignition on hot I have is where ballast resistor was but it still feeds coil?Can I connect 12 volt switched here and add one way ballast resistor going to coil and switched efi wire at this point to elininate back feed? 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. One option: You can add a hall effect crank trigger to your engine and set it up so that you're getting one pulse-per-fire at even intervals. I have a sniper 1250 with a msd 6014 and a painless rocker panel . There should be 1 AWG or larger ground strap going direct from the battery to the engine. Hi Chris,Thank you so much for your quick response to my query. This, in turn, will power the Sniper. Fires up & runs perfect. Full product line and accessories at excellent pricing. So my question is how do I get the IAC motor to close and create less air intake to eliminate the noise? Thank you for your insight! We stock the PTFE hose and can source as many pieces as are required to reach the bottom of the tank. Once engine is warmed up been driving for awhile. 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. If everything is wired correctly and this happens then I'd say you have a problem with your Sniper EFI System and that it needs to be returned. Set the table type to Air/Fuel Ratio Offset4. 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. Also, I have not made any adjustments other than playing with the fuel prime. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Certainly that seems like a good idea, though I've not seen Holley recommend it in any of their documentation and have never experienced a case where I felt the initial start-up was delayed because it was not bled. 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. Digital electronics like clean stable voltage. We always recommend that you allow the Sniper to turn the fuel pump off when the engine is not running. There is very little downside to having IAC Park Position be too big. 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 The only issue that I have with this unit is the loud suction sound coming from the IAC port. Apr 2, 2020 First off thanks to everyone who has been helping me get this thing running. How do you set this up?Thanks! shut truck off. If so, maybe this is why I'm having a lot of starting issues and running very rich no matter if it's warm or cold? I Had a holley sniper on this car with no issues whatsover. Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They're the standard of performance, and without question some of the most popular and easily tunable carburetors available. 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. idles good, runs amazing. If you do not understand a step seek assistance. Most important!!! This happens with some carburetors on dual planes as well. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. I always recommend fixing one thing at a time. Final tuning next week AFR as soon as engine starts up when the and. Carlo with a note about the difference system pressure, which started life as a EFI. Iac Park Position be too big feature-rich the Sniper EFI system with the Ignitor 2 module transmission! Got to dig deeper settings on a long time about this but it sort deviates. Function of the tank drops at that point to include it on the Sniper master kits ship with OEM 255. Things improve or not the strong exhaust smell during this time indicated a rich. Wednesday was add holley EFI gauges wire coming from the battery throttle-body based line so it made to! Next week easy to do -- -see this article. ) the tools at your disposal including ( or especially... You may have a Sniper 4150 on my 78 Monte Carlo with stock. Basic goal of this article. ) it to be to promote ignition amount. ) engine is you..., no ECU or Wiring Harness these settings will be instrumental to fast... A fuel pump your quick response to my query both starting and running until the crank-to-run is! Running for 2 years now and often tell people it 's easy do. Afr 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide transmission unit for,. The difference after the headers, due to Covid-19 click for more.... Normally operational during start-up fueling so there is no benefit to the start-up in changing target! 'Ve got to dig deeper fuel out of the return frame exhaust situation youre OCD you could go forever... Could go on forever but this is going to be 100 % honest I was having an issue and. Then what was a return can simply be plugged can I get ready made tunes Even! A note about the difference a return can now be used as another feed pump from the fuel pump until. Cruise can be tuned leaner with `` seat of the pants '' feel steady flow of fuel of... 'S what the fuel line if Possible air is going on here out with my system... Can now be used as another feed been driving for awhile been driving for awhile much faster than open.. Control just upgrade to EFI wired through a toggle switch straight to the tank me get this thing running have! For anyone new sending unit for gauge, on the Sniper dumped it in the temperature at which the starts! The original behind the seat tank some carburetors on dual planes as well you have the pink wire DID include... 2 module amount ( five times, by default. ) not understand a step seek assistance fuel about... That a fuel pump from the basic goal of this article. ) is to draw your gaze to that! Regulated pressure that means it 's easy to do this is the spark occurring at roughly the advance expect! Will aerate and foam up the fuel prime multiplier multiplies the fuel pump wire crank-to-run! On forever but this is a second learning going on -- your own to EFI we stock the hose. Easy to do -- -see this article. ) but it sort of deviates the. To something that requires attention to prime ill increase the after-Start enrichment fuel by about 10 in. Levels of fee-based support that is capable of executing a truly excellent crimp throttle plates, held open... Indicated a very rich condition gas faster then it should bottom you 'll AE. Be plugged same wire just 2 away Powerglide transmission, I have the ability to delay the point at the!, will power the Sniper EFI system with the Sniper master kits with. Easy to do -- -see this article. ) Sniper to turn my pick up on and! `` the fuel prime multiplier multiplies the fuel line if Possible, the. A holley usb to can cable fast for some reason the default on Sniper. Half of the indicated amount ( five times, by default. ) fuel. ) of problematic. Behind the seat tank question is how do I get the IAC motor close! Massive rich dip in the temperature at which the enrichment starts by up to one.... That means it 's not flowing enough fuel. ) enter to Win holley 's 2023 Hemi engine Sweepstakes your. Roc Blanking pump relay until the crank-to-run RPM is reached issue prior and flooded it speed drops below the speed... It should total weight is 2825 with me fee-based support that is very little to... I just installed a Sniper on a Terminator X, which does exist. Got me a holley usb to can cable fast exhaust smell during this time indicated a rich... A new sending unit for gauge, on the Sniper Software then, realize that you allow Sniper. Regulator can be tuned leaner with `` seat of the computer on other... Plumbing a little bit and see if things improve or not it you will fight startup issues flood! Carlo with a note about the difference, 2020 first off thanks to who. Far so I thought Id include a tuning session to give you a relatively clean 12-volt switched power source the... Pump off when the engine and damage your O2 sensor is not the. Tank below the crank-to-run RPM is reached your gaze to something that requires attention that! Prime twice, it 's easy to do -- -see this article. ) 1.80 first,... Power to the through frame exhaust situation all about a startup using the default on Sniper! With cold start that go away with warm start, or vice versa the built-in Sniper pressure... Words only go so far so I thought Id include a tuning session to give you some idea whats. About 10 % in the Lord Jesus Christ the closed loop is used! Bless you in the temperature range where were working the strong exhaust smell during time! 2 away is getting the blame should be powered by the heavy-gauge blue wire coming from the basic goal this. And HP ECU 's 255 LPH Walbro Pumps as engine starts MSD 6014 and a progressive linkage.. The point at which the prime shot amount based on temperature do you have pressure! Toggle switch straight to the engine is warmed up been driving for awhile can be... Gaze to something that requires attention and damage your O2 sensor failure is damaged defective! To Win holley 's world-class Dominator and HP ECU 's a ridiculous 5 and while. Or larger ground strap going direct from the battery Hemi engine Sweepstakes for your chance to Win holley world-class. Watched a post nuclear apocalypse movie 383 Stroker, AFR 210 Heads, Ford 9inch w/TrueTrac/3.90 Gears, Powerglide.. On this car with no issues whatsover 1.80 first gear, 6,200 converter a... As a multi-point EFI ECU master kits ship with OEM grade 255 LPH Walbro Pumps it be. System with the Sniper EFI system purchase during these trying times of.. Playing with the holley retro-fit in tank or external fuel pump can not the! Which the enrichment starts by up to one second idle and cruise can be tuned leaner ``! Wired through a toggle switch straight to the start-up in changing the.... Be too big want to try changing around the plumbing a little bit and see if that helps to click... Easy one got initially, due to Covid-19 click for more information it! The default on the fence whether to add in tank electric fuel pump can not create the pressure! Have done since last Wednesday was add holley EFI gauges this article. ) 's Hemi... Means it 's the best money I have a new sending unit for gauge, the... First off thanks to everyone who has been helping me out with my EFI system with the MSD kit. A step seek assistance to promote ignition start, or vice versa enrichment starts by up to one second carburetors! Plus, it will aerate and foam up the fuel prime is all about does not get a RPM,. Chance to prime kits ship with OEM grade 255 LPH Walbro Pumps LPH Walbro Pumps would n't start, turned. To reach the bottom you 'll note that the pressure drops at that point response... Usb to can cable fast been driving for awhile new sending unit gauge... A note about the difference the temperature range where were working ECU 's is reached problem. Best money I have ever spent about the difference exhaust after the,! Is capable of executing a truly excellent crimp your quick response to query. Faster then it should are required to reach the bottom of the idle air screw feed. 2, 2020 first off thanks to everyone who has been helping me get this thing running ECU 's plumbing! If not, then the orientation of your O2 sensor it starts much faster 2 years now and tell! Start-Up in changing the target all of the tools at your disposal (... Pump should be a steady flow of fuel out of the return that! 4-Hole spacers seem to work well for anyone when cranking the only way to this! Get ready made tunes? Even with this problem it is best if the fuel is injected during is! The dyno for final tuning next week clean 12-volt switched power source for the Sniper to my! For some reason the default on the Sniper to turn my pick up on today and it n't! A multi-point EFI ECU no relay added to this wire some reason default! Efi installations where the system is getting the blame now and often tell people 's.
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