so i recently bought a 2001 mustang v6 and the previous owner put a lower mile 2000 v6 motor in it. so to begin it idles rough, and at 1,200 rpm. i unplugged the iacv and it didnt make a difference just allowed more hanging idle / a little bit higher idle not by much. so i plugged it back in. i unplugged the MAF sensor and it died immediatly ( plugged back in started fine lil rough ). i also replaced the upper 02 sensors as well. and one more thing to mention, its a 5 speed. so when i climb rpms up to 3k higher it vibrates pretty good and is sluggish/ doesnt have much power. but seems to run good if going easy down the highway, cruises at 65mph perfectly. ant input would be greatly appreciated!
2001 mustang with a 2000 motor, idles at 2k rpm then goes down to 1200rpm.
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IF unplugging the IAC makes no difference in the idle THEN:
- there's a vacuum leak after the throttle body
- the IAC idle stop screw is set too high.
- there's binding in the throttle body butterfly or throttle cable.
- The incorrect IAC valve has been used for the application (black vented verses non-vented).
Here's some more information that may help.
Unplugging the MAF and immediate quitting likely means that the TPS is not sending a stable signal AND there's a vacuum leak.
Troubleshoot IAC idle problems 1996-2004
https://www.stangnet.com/mustang-forums/resources/troubleshoot-iac-idle-problems-1996-2004.13/
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so if the air filter box, that holds the air filter, if it isnt closed all the way, i think its just old. it literally has a gap about a half centimeter, would it cause a high idle? there is a black tube connected to the air intake tube up towards the throttle body, and if i squeeze it, it makes the engine lower in rpm. if that helps. im not good at finding vacume leaks. would leaking valve cover gaskets cause this as well? thanks!
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