Enjoy! Yes, the sound coming out of your Sniper throttle body is a pulsation from the fuel pump that is pulsing the mechanical fuel pressure regulator. Keep in mind that at 60 miles the Should the iac% fluctuate? Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. your IAC is at zero. Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle. In fact, it is those users who seem to end up most impressed with the system. installing and cruising down the highway 70 mph I just wonder if all I have to do Consider adding fuel in the AE vs TPS and/or AE vs MAP ROC tables in the area where the stumble is occuring.Since this is happening at such low TPS levels it is possible that your engine would prefer a lower (richer) target AFR number at idle. Be aware that there is a spring behind there and a diaphragm that you don't want to tear. You may have to register before you can post: click the register link above to proceed. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. I am having an issue with the IAC on the Sniper. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. When this occurs, I sometimes can shut it down and it will return to the correct settiings. You will find a startup IAC percentage, an amount of time it holds at that percentage, and an amount of time it takes to idle down to the normal idle speed.By default, that number is 50% at normal operating temperature. IAC Testing Procedure for EFI Systems I would disregard any correlation between idle control between the Stock and Street/Strip setups. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp. If I go any more it will ping. Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. My IAC and TPS show zero when it does this. The problem I believe this is creating is after I start vehicle (and its still in park), the IAC drops down to my hold percentage of 10% (since throttle % is not 0) before engine is warm and therefore causing the engine to stall out. Every time though I can turn the car off and restart and it settles at 850 with IAC 2-4.The thing that has me puzzled is how the with the only difference in condition of the car being the restart, the idle is "fixed"Any clues on where to look next please let me know. Kind of cuts into forum time. Target AFR at idle is 13.8%. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. Bolt on 4150 Flange Carburetor Replacement. So something is triggering the ECU to be in Open Loop. When I turn it off and try to restart it just cranks. When I put it in park the idle RPM was 2100-2200 each time. I installed Holley Sniper on three other Mavericks here in Brazil and the problem also exists.I did not make any changes to the parameters, only on Target AFR and the correction on the Idle Speed Curve chart. I installed a Holley Sniper on my Ford Maverick 302 V8. There is no sense proceeding until your TPS is at zero at key-on. If the TPS is 1% or below then the ECU is in control--2% or greater and the ECU thinks you've got it under control. The IAC is hanging open and not really at 0. When I drive with warm engine the IAC is at 30% when pushing gas, but shouldn't it be at 0%? EFI Troubleshooting EFIand and EFI Tuning Tips - In The Garage Media How to replace the IAC in the Holley Super Sniper. - YouTube It could be that the air flow across the secondaries as they are opening is creating that whistle but that isn't commonly the case.Did you check for leaks around the gasket of the air cleaner? It starts cold fine, its just when its hot. All times are GMT-6. Yes, having an accurate TPS is very important at idle. Sorry for all the questions, new to the efi world. )If you rule out a fuel supply issue then we're going to have to gather a few more clues. When I see that your TPS is 1%, that tells me that you may have an RFI problem. As you see above, the Sniper is going to dump in a maximum amount of fuel at zero TPS, begins to remove acceleration enrichment at 60 percent TPS, and then removes all acceleration enrichment correction at 100% TPS. MSD pro billet and 6AL box When I covered the IAC with my finger, the RPM dropped so low it stalled. Thank you for your input. Going lower with the blanking might pay dividends, but there is so little room below 7/8 that you will quickly be in a range where every tiny variation in the TPS or MAP is throwing extra fuel into the engine. Nothing against Holley's method but I need to keep things simple and I do that by eliminating the effect of the IAC entirely while getting the idle speed adjusted. Some have suggested the gasket might cause it but I've never heard of anyone fixing the whistle by adjusting the gasket (and many have tried. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. If you do find you have RFI issues then I've written an article on solving RFI problems. I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. What you are experiencing is rather common. Since that has long been corrected we have moved that information to the bottom of the article.). and when I close the IAC's hole with his finger, the engine is normal.The data on the touch screen I see are:AFR, A / F = 35.6 I'm going to jump out on a limb here and say you either don't have adequate fuel flow or pressure. Ok, so I'm stumped! Of the two options, I generally recommend the self-learn. Pricing was reasonable, shipping was prompt and Chris helped me with a wiring question during my install. Which means you either need to increase that number or increase the ramp decay time. Doesn't want to start, runs like crap. Once we recognize that, the next step is to narrow down all possible sources of additional air until we discover the cause.Start by keeping an eye on your IAC number. At 0% it shouldn't be sucking any air through that port, correct? I would start by datalogging the situation and seeing exactly what your learn table looks like in the area immediately around the tip-in. From herethe cycle continues and I am Or, at least, it should. It won't take much! Featured Products Sniper EFI $7.07 - $2,457.95 470 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation Pw. In the wizard I set my Idle to 500RPM but it never got slower than 800RPM, if I run the wizard again and lower to 400 RPM then it never gets lower than 700RPM.After reading about the Idle Speed curver I checked its settings and found that the curve was 300rpm faster at every point over the temp range no matter what temp I had, I adjusted the curve to match what I put in on the wizard and now the RPM is correct, I'd say you have a bug in the wizard.Idle Speed > Idle Speed Curve: Here is where the lack of coolant temperature is going to affect you. I've tried repeatedly re-creating the scenario in hopes that the E.C.M. Then Friday night as I was driving home, the car started acting up. Sniper EFI Initial Startup and Troubleshooting - Holley Jun 12, 2021. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. Free ground shipping regardless of order size! it seems to ramp to 60 psi on the initial prime, but as soon as the motor start the psi spikes.I guess a workaround would be an inline return/filter regulator? Idle was around 1000 mark and iac 0. It has gotten a little better after I drove it for three hours today.I want to save the Kik because if I get this working good then I would like to add A C and use the kick for it.Motor is Mopar 360 with mild cam and automatic. After only running for about 15 minutes or so the system starts to fail stalling the motor. engine works beautiful, the car runs a lot, but suddenly, the engine does that. Thanks for the info Chris. Duration @.050 is 240 intake 246 exhaust with .574/.578 lift. It's all part of the adventure! Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. Cracked casing from a side cover screw being installed crossed threaded. I have driven car about 200 miles. is train the system or there is actually something wrong.I do love the system at I think that your timing is too retarded. I have a set of 8.8 Accel Rfi suppression wires on it. No big deal, just time to re-adjust! Hi I wish I had bought from you but I didn't find this site until now. I would only play with this if you are finding that the other adjustments I suggested aren't working. Sniper EFI Idle Tuning. Solving Holley Sniper High Idle Issues - EFISystemPro.com I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. Turning off and then on again, the engine returns to normal. Running a bbc with coil - my timing is perfect. That's not the IAC Hold Position, it's a percentage value. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. Holley Sniper Iac Delete Any suggestions? This can cause the engine to run rough and may even lead to engine damage. If it is not a problem with the Sniper EFI System itself then it could be an issue with some sort of harmonic involving the fuel pump. Let This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 )Take a look at your AFR during the starting process. There are a few tell-tale signs that can help you diagnose the problem. I appreciate the help youve given to everyone as it continually helps me! Not that I noticed. Engine warms up to 195 degrees and stays. first attempt but as it tries to idle down to the target RPMsit can never even It is working fine when you restart the car, controlling idle perfectly at 8 steps open so it is unlikely to fail when the car warms up--or correct itself instantly when you restart it..So, if you don't have any vacuum leak, and the throttle plates are fully closed, the only thing I can guess is something is causing your ignition timing to change. If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. By the way your site and your accessory products are nice. Interesting question. Have you confirmed your fuel pressure at idle is 60 PSI? My IAC was constantly at 100% at idle. Running the vacuum advance and of course I time it disconnected. Last night I tried setting the IAC and had the same problems after it's warmed up. It sounds like you need a bit more of a fuel squirt on acceleration, Brett. At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. If the IAC is zero, and if putting your finger over the IAC port doesn't lower it, then it's not the IAC circuit. In the context of the Sniper the AFR that is being displayed is the AFR of ethanol-free gasoline based on the lambda that is being read by the AFR. You'll be amazed at how much of this just "goes away" when you drive it enough. I have quadruple checked my wiring and am certain it's correct. I.e. If you can send a data log to the vendor from who you bought your Sniper EFI System they should be willing and able to take a look and recognize RFI and then give you some ideas on solving it. Two things to keep in mind as you do that. That is certainly not normal! Often, folks will say, "I did everything you said. datsun sniper efi Holley RetroBright This 1974 Datsun 620 Bulletside Cruises With The Help Of Sniper EFI Bradley Iger 01/13/2023 features Latest News sweepstakes 2023 Hemi Engine Sweepstakes Gen III Hemi Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! We've already tried adjusting the Acceleration Enrichment chart in all ways, going up and down, RoC Blanking, everything, it has no effect. I haven't driven it for the 30-40 minutes like the several times it idled at 2200. The Sniper ECU can use the timing to help maintain the idle speed and that will definitely be useful in that transition from Park/Neutral to Drive.If you don't have ECU-controlled timing, or if you do and it's not fully compensating, it may be necessary to increase your target idle slightly. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. Tps is saying 26% when it at idle. What an amazing site you have here. Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. Featured Products EFI - Fuel Injection $2.59 - $6,499.95 2179 Products View Parts Sensors would correct it (as it has for a multitude of other drive-ability issues) but this one little glitch seems out of it's range. So check that timing and I think that you're going to find you need a good bit of advance. Glad to hear that you have timing control enabled, Gary. I believe because the TPS is not registering. Turning it off and back on would reset it, and then it would work as advertised for a while. Then it changes and will not idle down, the handheld will display 0% IAC but you can see and feel that the IAC valve is more like 100%. If the IAC number is increased during this high idle, review the points about high idle from tuning issues. If I'm driving along and pull up to a light and leave it in gear it idles just fine but it seems not to be able to compensate if I put it in neutral and then back and drive. have the system learn the higher speeds? Capability Range: Advanced It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. Really appreciate the amount of learning im getting off here. I'm thinking it could be the fuel pressure--- since I have a new Spectra EFI tank and there's been some reports of the interior coating coming off and gumming up the pump however the sniper display DOES NOT show fuel pressure.the Sniper DOES measure fuel pressure on its own - i've confirmed that with holley techs as they told me to purchase the fuel pressure gauge that can just hook up to the 1 wire gauge harness from the Sniper. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. My sniper is doing two thingsFirst issue, the idle is set at 800 and will idle fine, then There is a glitch in the system. When you key on, you will hear three distinct sounds: The ECU initializing the IAC, the fuel pump priming, and the injectors firing their prime shot. I'm also having a high idle problem but its different. So, clearly, the "No" answer is wrong. To figure this out it's going to be important to gather a bit more data. Bolt-on carburetor style EFI for your classic car or truck. The resulting resistance can burn up fuel pumps, wiring and relays. If I keep the rpm's up it does fine but my clutch can't keep up with this for long.Also when I cover the IAC port the engine dies. Please check your process again and see if you can see very specifically what is not working correctly. If the screen shows iac at 0 and you block the hole to find it open what does that mean? One additional wrap on the secondary coiled shaft spring is all that's necessary.
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