Both Sniper and trans controller grounds were direct to the battery ground, as they should be. is train the system or there is actually something wrong.I do love the system at What can I do? 63 bomb May God's grace bless you in the Lord Jesus Christ. That is not a huge problem but it just means the IAC has no ability to lower the idle beyond what it is running at that point. I chased that gremlin for about three weeks and was convinced I had a bad throttle cable. Yes, having an accurate TPS is very important at idle. However based on your reply I connected the Fuel Pressure gauge and If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Note that Brazilian gasoline has 27% ethyl alcohol. We are running a Sniper on my mates 355ci small block V8 & so far he is very impressed ! During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. Just wondered if you've ever run across a system not powering up? The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. Could be a bad IAC motor, replace it and see if that solves the problem. I have a 406SBC that does most everything right with this sniper setup. Or is there something else I should The symptoms I had was a low cold start idle and going lean coming to a stop. You've got it running and warmed up but now you need to set. Yes, it will talk to you--but not with words. hard start about 1/2 throttle from stop it bogs down after 3 or 4 seconds.What I If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. Hello MAP Sensor. Interesting question. :-). First, recognize that the IAC and the TPS are not inter-related in any way. Or alternator? First, let me congratulate you on your patience in letting the system learn. How can I adjust the startup speed down to about 1400 RPM? When you set the Static Timing to 15, what did you read with the timing light? What would cause the idle to faulter like that? So you installed your Holley Sniper. Thanks. I will turn it up some. Hi. Reducing that a bit will help. But there are several degrees of play there in which it should still work fine. After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. If the connection is loose it will cause the system to shut fuel off because the signal telling the EFI the motor is turning stops (to prevent excess fuel from being dumped in the motor). Your comment doesn't imply any sort of problem that would make me give up on idle timing control. When I drive with warm engine the IAC is at 30% when pushing gas, but shouldn't it be at 0%? It's not necessary to drive it that way. We've already tried adjusting the Acceleration Enrichment chart in all ways, going up and down, RoC Blanking, everything, it has no effect. Hello, Chris, thanks for the help.I have not installed the software yet, and I'm having trouble with two cars. I'll give the ". Then Friday night as I was driving home, the car started acting up. 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! Bolt on 4150 Flange Carburetor Replacement. 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. 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. The 5-6 times it has happened now have been after the car has been running for at least 20 minutes. When the system is up and running the fuel pressure regulator inside the Sniper is making a rattling sound like a shaking a paint can. However, whenever you start changing things, you can get into a chain reaction. But if the idle is a little bit higher then it doesn't have to jump quite as much in response to the load, and tends to react a little bit more smoothly. (Do this while you are cranking.) Bolt-on carburetor style EFI for your classic car or truck. Sniper is still learning so it will continue to improve.Second, you may have heard the phrase, "correlation is not causation." As you have noted, each time the idle goes up. It would be possible to set up a 1D or 2D table and do something like this, so if you've gotten into these advanced setups then that would be another thing to check.If neither of these work then I'd recommend that you do a data log of the engine idling as the temperature is reaching and then exceeding 200 degrees. Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. No, the idle speed curve setting isn't something that you normally worry about--and especially not down at minus 40 degrees farenheit. Handheld shows plenty of fuel so I dought it's an issue there. Strangely, what I've seen is that it idles too lean as the injectors are effectively shut off.Thanks again for the follow-up and glad to hear that everything is working well now. However, I have never found that to be the case. So, clearly, the "No" answer is wrong. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. Throttle Tip-In tuning can be a bit of a challenge but I'm confident you can get this resolved, Mike.Let me start by saying that unless you've really done a lot of driving on the system in some useful learning situations then I would set this issue aside and not even think about it. Worst case you'll have a spare on hand, and if the TPS is faulty you will have solved the mystery. So I have been doing the slow take offs and thinking that it would learn its way out. I recently had IAC issues identical to what you describe. Let Since it is unlikely that anything else changed it is most likely the IAC is problematic or the butterflies are not shut all the way. Note: The IAC breather hole is the roughly 1/4-inch triangular hole that sits above and between the secondaries. Start engine let it warm up to 160, learn mode is learning. The window you saw in the image above pops up. 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 The team at Holley has designed the perfect solution for your problems. Next, reach down into the secondaries and push the butterflies closed. If they are closed, check the primaries. That's what you're seeing. 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. 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. If you get into the practice of hearing all three of these sounds you will know if you have a problem even before you turn the key to crank. Target AFR, A / F = 13.5 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. Last night I tried setting the IAC and had the same problems after it's warmed up. If you go too high then the motor will not return to your target idle when you come off the throttle. This is Intermittent meaning, I can run this test 5 times and IAC will function incorrectly 2 out of the 5 times. is the fuel pressure. Plus, you can email that file to me and I can be of more help. Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. TP range is normal goes up to about 90% with throttle pedal to the floor.
PDF Sensor Diagnostics and Statuses - Holley Any ideas here? Camshaft is M-6250-B303 .480 lift intake & exhaust, duration at .050 is 224 degrees for intake & exhaust. Holley have given a new unit. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. Great work, expert!
EFI Troubleshooting EFIand and EFI Tuning Tips - In The Garage Media The noise is definitely coming OUT of the throttle body. Well you were right air was entering from another source. Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's. 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? If A good example of why it's so important to run a good pre filter in the fuel line. And the only way to be positive about that is with a gauge.Unfortunately, the Sniper does not provide an input for an electronic sender so the next best thing is an analog gauge. Thanks. I am Japanese who attached Sniper EFI. Take it a step at a time. >I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. Add To Cart. Simply go to those cells, tweak them up or down as required, and the ECU should now be able to learn its way around the bog. The resulting resistance can burn up fuel pumps, wiring and relays. No matter what do, my idle will not drop below 1350-1400 RPM when the engine warms. What an amazing site you have here. 90% of problems, (INCLUDING MYSELF) could be answered/fixed by just reading the instructions.
Sniper EFI Update: Weeks Later, Do I Still Feel It Was Worth It? If the ECU has not spent some significant time learning yet, I'd recommend going back through the setup wizard and getting everything back to default. You will need to change the -40 degree idle speed setting again but I recommend not touching anything else. This may require shortening or lengthening a rod. If you're having issues with your Holley Sniper IAC getting stuck at 20, there are a few things you can try to fix the problem. The biggest issue is these problems are intermittent meaning they do not occur all the time.