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rpms r going up and down and it stalls out and stopsigns and stop lights I need to locate my iac on my 4.6 liter v8 engine ford f150rpms r going up and down and it stalls out and stopsigns and stop lights I need to locate my iac on my 4.6 liter v8 engine ford f150
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Re: My rpms are jumping up and down and it stalls out...
Its the little black, plastic sensor on the left of the throttle. Ford and Mopar do not use an IAC to control the idle, but rather a MAF and Throttle Position Sensor or TPS.
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how many miles on engine? plugs ever been replaced? computer is trying to compensate for engine miss, this will effect fuel trim and (i a c ) idle air control valve. rpm will go up and down, check EGR operation, and ports for clogging and if who ever pulls plugs make sure they have done a triton engine before. loosen 1/4 turn engine hot, soak plug holes with brake cleaner and PB Blaster penetrant let set over night then remove plugs. blow cylinders out meaning spin engine over before installing new plugs. hope this helps
The F 150 depending on the engine has a MAP sensor if the sensor vacuum get disconnected or even if the sensor fails the result is black smoke.RPM jumnping up and down look for a vaccum hose that is disconnected or broken.
Check IAC sensor and TPS and MAF sensors if IAC is ok. IAC will amke your idle go up and down all crazy and cause stalls when slowing down or releasing throttle but TPS and MAF also can effect this.
I don't have the solution, but I have the same exact problem on my 1991 Escort 1.9L with auto with 120K miles. I replaced the IAC with no difference. In fact I unplugged it, and still had the random stalling. Also disconnected the EGR vacuum line...still stalled randomly. After it stalls it always starts right back up again. Sometimes it will act as if it's going to stall, but comes back to normal idle. Park or Drive makes no difference. Acceleration and all normal driving is fine. The next thing I was going to try is hooking up a timing light and watch to see if the timing light stops flashing as it's stalling, and/or hooking up a fuel pressure gauge somehow, to the fuel rail, to see if the pressure drops when stalling....to figure out if its ignition or fuel related.
If it's a 7.3 deisel, your timing could have jumped one tooth or your injector pump slipped one way or another. Pull your pump, lines and gear and engrave a line straight up from the timing mark so you can see it when you reset the timing gear.
rpms r going up and down and it stalls out and stopsigns and stop lights I need to locate my iac on my 4.6 liter v8 engine ford f150
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