Turn the idle speed screw on the primaries in about 2-3 turns after it makes contact with the linkage and starts opening the primary throttle blades. ps. I've been having problems with my sniper efi just shutting off. However, I have never found that to be the case. I believe that you have this problem solved now with your new inline filter/regulator. These problems will go away when you do that. Since a key cycle resets it to 0 and out to 30 or wherever It is made by one of the biggest names in fuel filters and sold under the Parts Master label so it is quality and great price in one. So, this is what it takes to put a Sniper on a small-block Ford. I can have it working fine (5% to 10% at target idle at operating temp.) But get that fuel system fixed before going any further. You could go either way.. I go into much more detail about that in this article on startup tuning. Turning it off and back on would reset it, and then it would work as advertised for a while. One of the best Ive seen so far. If more info is needed just ask. 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. EFI System Pro had everything I needed for my EFI upgrade. shut truck off. 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. You may have to register before you can post: click the register link above to proceed. Or, at least, it should. Definitely not 90. Hey Tommy, we've got at least one thing in common. And, while that is happening, make a note of the temperature before you engage the starter, and then the rpm when it starts.The Idle Parked Position is set on a temperature-based graph like the Idle Speed Curve. If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. After it starts it idles around my 960rpm setting + or - 100rpm. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. I've helped folks work through a number of challenges with their Sniper EFI System installations. This question is really outside both the scope of what we try to discuss in the comments section as well as the overall subject of this article. Hi Chris. Ilike a few othersam having idle issues. I have replaced the IAC motor and the problem remains. An under-sized filter will allow part- throttle operation but fuel pressure will drop at WOT and run very lean - perhaps surge under power. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Given the circumstances I would say that it is either the IAC motor itself or RFI but you seem to have ruled both of those out. When the idle speed screw is turned all the way out there should be just enough room between the bore and the blade to catch your fingernail. That initial rev is going to be determined by your IAC Park Position. Installed sniper on 65 galaxie. Be sure to re-enable it once you get your idle tuned. The RPM would increase for no reason. This will go a long way to improving your fuel map without manually adjusting the acceleration enrichment. Part# 538-13. I set the AFR at 13.5 and all is good now. Give that a go and see if you don't make some progress! I had this same exact issue. But once you come off the throttle there is a minimum RPM that the ECU wants to see before it releases the IAC from the park position and that is normally 1000 RPM over the target idle. Or is there something else I should Then do it just a bit faster--just enough for it to bog a bit. Duty Cycle% = 3 Technically it is a warranty-voiding maneuver so proceed at your own risk. I have seen this become blocked with debris / dirt in the fuel system and cause a high fuel pressure condition . You want to ensure that nothing is hung up in there.The only thing that I can think of that would cause the fuel pressure to spike when the motor starts is the increased fuel flow at the higher alternator voltage (jumping from 12.0 to 13.5 volts or so.) ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. You will have to do this until the TPS stays at 0% when the throttle is closed. Switch power to the Sniper on and crank the engine. In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. One of the great features of Holley's Sniper is the ability to set your air/fuel ratio (AFR) where you want it. Then Friday night as I was driving home, the car started acting up. Do please let us know what you find out! This only happens when coming to a stop and the idle is ramping down to the set idle RPM. Capability Range: Advanced If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. If you feel you have no other choice but to run a Sniper and stand-alone controller then you can give this a try. I'm running a 408 sbc. I think in some of the Wizards with the handheld it doesn't use 57.5 as the default. One additional wrap on the secondary coiled shaft spring is all that's necessary. After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. carburetor setup, but it does blow when I can't jump on the highway like I use Im not sure what its doing, have messed with after start fuel, fuel at cranking. When you open your IAC to 30% you are naturally going to have a high idle condition. When I put it in gear, it drops so low that it will stall if I don't add throttle. hard start about 1/2 throttle from stop it bogs down after 3 or 4 seconds.What I Properly configured, the Sniper does a fantastic job of responding to the transition from Park to Drive. It could be a problem with the power/ground for the Sniper but much more commonly this is a result of too much RFI. Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish MSD pro billet and 6AL box This curve turns the idle speed down as the engine warms. and if you do run into any problems then, yes, the plethora of tunability adjustments available through either the handheld or the Sniper Software will certainly be enough to get you right where you need to be! Hang in there--you can do it. I did read some comments on regulator issues is there a way to check it for an issue ? I was shocked to see it at 95lbs!! Hello. But now that Terminator X is available, I highly recommend going that route. In the Wizard, select the stock cam setting. Do I have to hook up sniper ac wire to relay or should iac pick up idle? My issue is that when Im in stop and go traffic, I can let off the clutch and the engine revs and doesnt quite want to come back to idle. This is very disappointing as people love to hear the motor while the hood is open.Thanks Jon. Clearly, something is changing. At 0% it shouldn't be sucking any air through that port, correct? The jack-rabbit start can usually be minimized by adjusting the throttle linkage. That could be a problem with the TPS or it could be some sort of throttle linkage issue. Note that sometimes you can get into a back-and-forth situation. Comp. It is easily solved by installing a four-hole gasket or four-hole spacer (depending on your hood clearance issues.) 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 installed the Sniper on my 1978 Ford F-100 with a small block WIthout knowing quite a bit more it will be more than challenging for you to identify the problem and solve it.Fortunately, Holley provides their amazing Sniper Software. Laptop Access Seems to be working. And thanks again for taking your time to answer these questions. Then follow all of the instructions above, including confirming the idle speed curve setting at -40 degress as well as following my 10-step process for setting the idle. :-)Yes, learn impacts idle too, and remember the even when the basic learning is done there will continue to be some learning for changes in weather, altitude, etc.Go ahead and try a few idle settings and see how they impact the idle-speed searching. Copyright 2022 Holley Performance Products, Inc. All right reserved. Give them a call and if they are unable to provide customer support the contact the Holley tech support line at 1-866-464-6553. Good luck! It drops about 200rpm when clutch engages. check, I guess after reading everyone saying how great the system is after Eventually the IAC will drop back to zero, I'll readjust it to 850 RPM & 2-9%, and then watch it steadily climb again. You can drop it down and you will find it will behave more like you expect. However, I always preach to never touch any of the controls on the handheld until you have a couple hundred miles on the engine in a range of driving situations. There are six different acceleration enrichment tables that you can tweak and that may be the way to go. Then you can take a close look at the IAC and see if it is opening. Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. Always had to set idle above 950. Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. While confirming, in the handheld ensure that the Reference Angle is set to 57.5 and that the Inductive Delay is set to 100. The ticking is inline with the fuel pressure I feel squeezing both the fuel return & delivery lines (like a heartbeat). I took some pics of the sensors page this morning after the car warmed up. This page was generated at 12:26 AM. check out the. I installed another return spring for the rear plates problem solved instantly. Repeat until that stumble goes away, and then try a bit more throttle. This page was generated at 12:25 AM. Sniper EFI Idle Tuning - Holley Motor Life The Super Sniper will allow you to monifor fuel pressure if you add an electronic sender but this is not an option with the standard Sniper. Good afternoon Chris, thanks for taking the time to help all of these folks that didn't purchase from you- myself included!The issue I seem to be having is at idle in both park/neutral and drive. I very pleased with the performance, it is a huge improvement from the 800CFM carb I had on this motor. Hello Now, 1% on the TPS isn't a problem, but when it goes to 2% (which is inevitable if you have RFI moving it to 1%) then the IAC is going to go to it's hold position (30% by default) and the engine is going to rev up. I called support line he said he would have to look into it and call back. Please let us know how this works out for you! Ive played with the timing on this thing multiple times.Car was fullly restored last year. It is probably that your RPM above the maximum point at which ramp-down can occur. Should i adjust idle screw with the fans already on? Um, no. Copyright 2022 Holley Performance Products, Inc. All right reserved. I did notice that when I thought I had it set I have seen a couple of videos on you tube of the same issue but they don't seem to have found the cure.I hope it is not a computer problem as I have already replaced the entire system because of another problem. Holley Sniper IAC | Chevy Nova Forum This is extremely unreliable afrer warm. If i adjust the throttle plate screw in to bring IAC in to proper range say around 7 the engine is running around 2000 rpm. That 60% (which is configurable) is known as the Clear Flood TPS. For the first couple of drives it was running well, Sniper EFI was working exactly as advertised. any advise would be appreciated. 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? That is certainly not normal! You can disable the idle spark control at the locations below. I hold my foot steady in place it does this in 5 second cycles and if i let go of Any suggestions would be appreciated. It reads 0 at idle and when I accelerate it goes up to 30 and makes a loud sucking sound that seems to be holding the car back. Its on a big block Mopar with stock electronic ignition . My problem is low idle. Am I missing something. Running the vacuum advance and of course I time it disconnected. You can re-enable this after you have completed this idle speed adjustment process. Ive had an idle at neutral as high as 2400 rpm. If you drop it too far the engine will stumble or stall when coming off the throttle with the car out of gear, so you'll know when you've gone too far. If the screen shows iac at 0 and you block the hole to find it open what does that mean? Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. If there's any run time on your current setup the Sniper may have some bad learn data due to what appears to be timing issues. But another thing to consider is adjusting your target A/F ratio. How can I adjust the startup speed down to about 1400 RPM? In this short video you learn to replace the IAC. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? So glad this was helpful. knowledge with the sniper efi setup. Shut it off and immediately restarted and idle was now 880 with IAC at 8.If this is a vacuum leak I can't figure out what would cause it to go away immediately after shutting down the car and restarting. Hello Chris. It then idles up from 750 to 1100. If you have any questions about the car/setup let me know. Holley EFI Electronic Fuel Pressure Gauge, article on choosing between Sniper and Terminator X throttle body solutions. The distributor was loose. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. Enjoy your Sniper! The symptoms I had was a low cold start idle and going lean coming to a stop. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. I would gladly engage with you to solve this but ultimately you are going to need to go through whomever you purchased the system if a warranty return is in order. First, recognize that the amount below your target where you set the hard idle will be different on different engines. The Sniper even has a feature that allows it to use the idle timing to control the idle speed. I'm also having a high idle problem but its different. have the system learn the higher speeds? Thanks Again for your help. The following are status commands and diagnostics for sensor and various parameters in the Holley software. Try it! If the vendor from whom you bought the system is coming up blank on ideas then don't hesitate to contact Holley's outstanding tech support department directly at 866-464-6553. I would start by removing the progressive linkage. Please check your process again and see if you can see very specifically what is not working correctly. Thank you. 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. I think that this time around you will find that it starts and idles really well and only gets better from there. Holley Motor Life And Earl's makes a fantastic little 100 PSI gauge. If you find that the IAC is more than 8 percent, repeat this process and instead of shooting for 50 RPM below your target make it only 40 RPM below the target idle speed. Once engine is warmed up been driving for awhile. IAC is good 0-5% most of the time. I recently detached the TP sensor from the side of the sniper to physically move it and it still would struggle to get to 0%. Also if I give it a Earl's Mechanical Fuel Pressure GaugeI could use that for a quick troubleshooting for 1/3rd the cost of the Holley one. If you look down and your TPS is 2% then either your throttle is stuck slightly open (which itself will cause the idle-up) or RFI riding on the TPS signal has caused the ECU to see the throttle as open and, as a result, open the IAC to the hold position.
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