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What does a bad IAC cause?
the engine to stall and surge at idle
Why does your car turn off when you unplug your battery?
It shouldn't. When the engine is running, electricity is supplied by the alternator, not the battery. If the engine dies when the battery is disconnected, the battery and/or some related part (such as the voltage regulator) is bad.
What would make the service engine light stay on and the engine race in your 1994 Pontiac Grand Am The engine is a 4 cylinder quad 2.4L?
A bad IAC (idle air control)or vacuum leak. Check for bad vacuum hoses first, the IAC is around $50
Your 1995 dodge avenger v6 dies when stopping or will idle extremely low like 100 rpm's why help?
bad IAC
What causes 2.9 engine to hunt idle and stall?
possible bad TPS, IAC, or ECT sensors
When your 1997 wrangler 2.5l idles runs great give it gas it dies any answers to what is causing it?
probably bad TPS, or IAC sensors
What causes a 96 Chevy Tracker engine to die at idle when ac is turned on?
probably got a bad IAC motor
How do you tell if Alternator is bad?
Get engine running. While the engine is running disconect the POSITIVE termninal from the battery. If the engine dies, the Alterntor is bad.
What are the symptoms of a bad engine coolant temp sensor?
If you unplug sensor and one or both fans come on.
How can you tell if your alternator is bad on a 1995 Ford Bronco?
Start the car, unplug the battery the alternater should power the car. If it dies the alternator is bad. You can also get it checked at any parts store.
How do you know if your iac valve is bad are there symptoms?
Your motor will idle badly. The revs will not stay at a constant level, even when your engine has reached operating temperature. ***Sum's Answer***- the engine will idle bad, and it wont catch its idle when droping RPM's. It may drop to 500rpm, shoot back up to 1k then slowly figure its way out to 6000-800rpm. Overall, it will idle badly, and not know where its going. It may not be your IAC motor though, I had that problem in my 03' Cavalier and it wasnt the IAC, it needed a computer update.
How do you know if iac is bad on a 2000 ford expedition xlt?
Sometimes your engine rpm will rise on it's on. It will sound like the ANTIQUE-STYLE OOOGAH HORN
