I know its not flooded because I can pour a little gas in the throttle body and play with the accelerator and it will start and run fine. Wish I had bought my sniper from you, but unfortunately didnt. This is more of a bit of a reality check. Fuel Flow lb / h = 12.1 Not that I noticed. is train the system or there is actually something wrong.I do love the system at Common killers: No filter in front of the pump, reverse wiring, driving with PWM voltage, running at dead-head pressure.Since it sounds like your pressure is right, and since the Holley system doesn't provide a PWM voltage, that pretty much rules out everything but the lack of a filter. I think that this time around you will find that it starts and idles really well and only gets better from there. The IAC should display a 2-8% to bring the idle up to the actual target. If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. This happens no matter how much I adjust the idle screw. I put it in neutral and the idle RPM had increased to 2100-2200. If you use your handheld to go here: 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. Since the shield was put on, not a single problem, not one. Is there away to program the ecu to compensate for this at start up. Installed sniper on 65 galaxie. This will tell us if the ECU thinks that it is in control of setting the idle or if it thinks that you are driving the engine speed with the pedal. What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. 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. Closed Loop Compensation rises to 100%, Do I just keep pushing it the same way to The team at Holley has designed the perfect solution for your problems. New install, when in setup wizard TPS says 90 percent and I checked the linkage and butterflies. I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. I also raised idle at Park a bit with the idle screw. ChrisI finally got everything resolved. As I would slow down for a stop sign or stop light, the car would run really rough and the idle did not want to come down. shut truck off. Setup: 1965 Impala SS; ZZ6 Crate Engine, EFI Distributor. ps. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. Hello. We are using Target AFR of 9.0: 1, Fuel Base approximately 40% higher. Idle was back to normal but iac was at 0. Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. He thought that something was wrong because when he set the idle 50 RPM below his target the resulting IAC postion was far too big. But if I take off from a stop and go to 1/4 or 1/2 throttle its fine and takes off like a banshee. Since the load is more of a wave that increases the most initially and then decreases again, the ECU is doing really well to get the idle under control in only two or three over/under shots as you describe.You don't mention if you have your Sniper ECU controlling timing. You can re-enable this after you have completed this idle speed adjustment process. If you set the RPM above idle to start ramp too high, then it may not ever get down to the RPM above idle to re-enable. I will turn it up some. Thanks for any help. Even though you think your timing is perfect I'd suggest you try cranking about 5-10 degrees of advance into the distributor and just see if that doesn't work better for you.Remember this: adjustable timing pointers go out of adjustment and harmonic balancers slip. I'll give the ". itself out and hold idleeventually stalling. In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. 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. I watched the butterflies start to open at about 35 on TPS. Have you checked your fuel filter and made sure it's not plugged?If both of these are okay you're going to have to find a way to monitor your fuel pressure while under load. Target AFR at idle is 13.8%. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Turned it off and on again. When I first told him to check for leaks he looked back there and said "all good". Idle quality is great, RPM is good, sometimes IAC is jumping around from 35 to 60. I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. I emphasize "and" because the transmission controller manufacturer I used had the TPS ground terminated within the harness to the unit's main ground, which I find to be an unthinkable choice. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. He has walked me through every question Iv. Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. Thank you. back upthe RPMs shoot up to anywhere between 1500 and 2000 and they will not get The Sniper will be controlling the timing so it will be based on a multitude of factors. Sometimes it sounds like it wants to crank at the start but runs out of gas. All times are GMT-6. Sniper EFI Problems - Holley Performance Products Forums 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 I would continue checking the electrical connections along the fuel supply. Eventually the IAC will drop back to zero, I'll readjust it to 850 RPM & 2-9%, and then watch it steadily climb again. I keep doing that with the same result. Throttle Tip-In puts you in a part of the fuel map where you stay for only milliseconds at a time. I did all of this before seeing the link you sent. Cl. However, I have what I will call a whistle at a throttle position on 35 - 50. I set it exactly like the instructions said and my iac is not only all over the place but when I finally did get it to the 2-10 range it's highlighted in red. :-DStill, I hate to leave someone hanging so I'll try to help. Please advise. Holley Sniper EFI My primary reason for going EFI was drive-ability, (Startup and take off without waiting for the engine to warm up) and not have the occasional hesitation a carburetor has especially just barely opening the secondaries. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. It then started working normally again. It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. If it is then something is commanding the ECU to open the IAC. 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. So, if pressing the throttle is making it start, it's because you're flooded.Which is consistent with your rich idle condition comment, right? My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. The "PC Text" indicates what will be shown on the PC/Laptop data monitor or data logger. In the warm state IAC adjusted to a position of 2 to 10%. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. I do know that the reference angle is 57.5, the inductive delay says 100.0. is jumping all over the place when you experience this condition, it does not Ok, so there are a couple peculiar things going on here. If they are closed, check the primaries. However, I can't think of a single one that was because of low vacuum. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. Was perfect idle iac reading 3. I have a set of 8.8 Accel Rfi suppression wires on it. Initial thought is timing but Im running a cd box and the ecu is not controlling and I did not physically change it during the install. To do this, open up the Initial Startup gauge screen that was used in section 17.0. After it starts it idles around my 960rpm setting + or - 100rpm. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. If your fuel pressure is at or about 60 PSI then visually inspect the barrels of the throttle body while having someone key on the Sniper. Does that make sense to you? You will need to change the -40 degree idle speed setting again but I recommend not touching anything else. The very first thing I would do is get ground truth on your timing. I've made all the adjustments, all the settings, and the IAC issue is driving me crazy. Thank you. Turning it off and back on would reset it, and then it would work as advertised for a while. Is this normal ? Often, folks will say, "I did everything you said. The RPM would increase for no reason. The throttle position should be zero. no timing control. 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. EFI Troubleshooting EFIand and EFI Tuning Tips - In The Garage Media I looking for your expert opinion. Is that normal? It's called tuning. A good example of why it's so important to run a good pre filter in the fuel line. And if you're going to go this route I'd recommend that you switch from "Simple" (3 A/F targets, one each for Idle, Cruise, and WOT) and go to the 2-D Table We are running a Sniper on my mates 355ci small block V8 & so far he is very impressed ! Suddenly, the engine accelerates alone, hears a great deal of air being sucked in, If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. After only running for about 15 minutes or so the system starts to fail stalling the motor. 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. See these. 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. The only way to do this is by installing a mechanical fuel pressure gauge. Also its extremely rich at idle. I presume your idle speed table doesn't increase at 200 degrees? Took it for a lap around the block and came back. Supports up to 650hp with Four 100 Lb/Hr Injectors! The jack-rabbit start can usually be minimized by adjusting the throttle linkage. The resulting resistance can burn up fuel pumps, wiring and relays. This is Intermittent meaning, I can run this test 5 times and IAC will function incorrectly 2 out of the 5 times. Also if I give it a I have a Holley Sniper EFI with HyperSpark ignition. Wish I knew about it before I made my purchase. I have one customer who is having some similar issues and his AFR is down at 9.6:1 when it won't start. The symptoms I had was a low cold start idle and going lean coming to a stop. 680-700.I can't find any reason other than it looses where it is in the firmware with The person I bought it from said he never could get it to run for more than a few seconds. Hi Chris, I have a lean stumble on throttle tip in 2-3% tps taking off from a stop light the afr will go to 19afr and the engine will stumble for a split second. Camshaft is M-6250-B303 .480 lift intake & exhaust, duration at .050 is 224 degrees for intake & exhaust. 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. I think in some of the Wizards with the handheld it doesn't use 57.5 as the default. At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. I can tell you that when things aren't working the way you wanted them to work that nothing beats knowing for-sure that you don't have a fuel supply problem. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. I keep wondering how it was running so good with Sniper EFI Initial Startup and Troubleshooting - Holley Since your target is probably more like 700, and since 2400 is way over 1700 RPM, it's going to leave the IAC in the park position.Buckle down and find how air is getting into your engine. And yes, monitoring the fuel pressure is the right answer. Repeat until that stumble goes away, and then try a bit more throttle. Just getting it to act right at startup is a struggle. When I start the motor I have to push on the accelerator pedal for the motor to start. If so remove it. If this is the case then some adjustment of the linkage or the butterfly plates themselves is necessary. The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. Capability Range: Moderate Mechanical Fuel Pressure Gauge on the inlet of your Sniper, now is the time. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. My Sniper is 99% great! Hey Tommy, we've got at least one thing in common. idle counts from 0. around 45 mph it bogs down, catches itself, bogs, catches, bogs and catches. any advise would be appreciated. I have driven a stand-alone transmission controller for the 4L60E in my (then) Sniper-equipped '95 GMC pickup using the Sniper TPS with complete success.
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