I have a relatively stock 1990 5.0 gt 5sp (only modifications include headers, exhaust, and ford racing spark plug wires 9mm? and possibly spark plugs I dont know the specs on them- all of which came with the car.) I have only owned this car for around a month or so, and I am new to the game when it comes to working on it. I'm trying to learn though. Anyways, I am having idling problems and need some help. When I push the engine some on the acceleration, my engine starts to idle at unusually high rpms. For example, upon acceleration, when I engage the clutch, the rpms go up rather than down and then in neutral the engine idles at around 2500-3000 rpms. This only occurs on occasion, however, and not every time I push the engine (which is not all that often). I have read that with fuel injected vehicles, it could be a million different things, but I have tried only a few things to fix it. I took off my IAC valve and cleaned it w/ carburetor cleaner, as well as removing my throttle body and cleaning it because I heard that with the carbon build-up, it is possible that too much air is getting into my engine due to these 2 things not being able to fully close. This, however, did not work, and I was wondering if anyone has had a similar experience and how I can go about fixing it. Thanks!
Idling Problems PLEASE HELP!
- Thread starter 90FoxBody
- Start date
Welcome to the wonderful world of 5.0 Mustang idling..You have now joined a quest that has many begginings,ending,s and routes...lol...Anyway,mine had a bad IAC..But you could have a dirty TB,vacc. leak,dirty/bad IAC,bad TPS,unmetered air....a whole lot of root causes...Check for vacc. leaks first then the IAC and TPS and go from there....good luck to ya.
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