Rough idle after warm up
Thread Starter
Intermediate
Joined: Jun 2003
Posts: 40
Likes: 0
From: Long Beach Mississippi
Rough idle after warm up
I have an 85 coupe that idles fine when it is cold, but as soon as it warms up something changes and it has trouble staying at a constent idle. In fact it tries to die. I think it has something to do with a vacuum leak but I can't find it. Anyone out there have this problem before?
Pro
Joined: Jun 2003
Posts: 559
Likes: 6
From: OKC OK
Re: Rough idle after warm up (wmm1955)
Yeah. Exact same problem in my 85. No codes.
I've replaced everything but the MAF and the intake air temp sensor now and still have the hunting idle.
It's killin' me! :nonod:
I've replaced everything but the MAF and the intake air temp sensor now and still have the hunting idle.
It's killin' me! :nonod:
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: Rough idle after warm up (wmm1955)
Check your O2 sensors output. Jesse had a good post on this a while back, do a search and it will give you a good start on checking the problem. I doubt it is a vacume leak because the car runs fine untill it gets warm. It sounds like a Open loop/Closed loop problem.
Advanced
Joined: Nov 2003
Posts: 89
Likes: 0
From: Apollo PA
Re: Rough idle after warm up (wmm1955)
Put an ohm meter across each injectors pins when the engine is cold. If they are all within .1 ohms of each other, repeat the same test with the engine hot. It's likley that when the motor is warmed up, one of the injector coils is breaking down. :seeya
