Rough idle
Thread Starter
Intermediate
Joined: Sep 2003
Posts: 35
Likes: 0
From: Novi Mi
Rough idle
My car drives great when I'm on the gas, but if I stop at light or get stuck in traffic my oil pressure drops and the car starts to run rough. It acts like it's getting ready to stall, although it never quite has.
Once I'm able to get moving again everything is fine once more. The problem seems to be worse when the engine gets warmed up to operating temps.
Any ideas what the problem might be?
Once I'm able to get moving again everything is fine once more. The problem seems to be worse when the engine gets warmed up to operating temps.
Any ideas what the problem might be?
Instructor
Joined: Jan 2005
Posts: 204
Likes: 0
Im experiencing the same problem in my 87. Is it throwing any codes. One of mine was code 15 for the coolant temp sensor. unplugged it while i am waiting for a new one and it seems to be running fine. Now on to the other codes. ( 33 and 42)
Also a throttle body and IAC cleaning helped to smooth out the bucking and raised the RPMs at a stop in gear.
Also a throttle body and IAC cleaning helped to smooth out the bucking and raised the RPMs at a stop in gear.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If there are idle speed issues, clean the TB & IAC and reset base idle and TPS.
If the roughness is a miss, connect a timing light in turn to each spark plug wire too see if the engine misses coincides with missed flashes at any of the wires.
Burning Brakes
Joined: Nov 2003
Posts: 935
Likes: 2
From: Beverly, NJ
Originally Posted by 65Z01
If there are idle speed issues, clean the TB & IAC and reset base idle and TPS.
Clean trottle body and IAC, and reset base idle. This will probably solve the problem.
Racer
Joined: Aug 2004
Posts: 379
Likes: 170
From: Buffalo Grove IL
Not sure what year you have, but if it's '89 through '91 or so, check the fuel injector coil resistance, the fuel injectors used those years have an issue with the injector coils shorting.
I had the same symptoms you describe, and it was the injectors.
Good luck!
Ben
I had the same symptoms you describe, and it was the injectors.
Good luck!
Ben
Instructor
Joined: Jan 2005
Posts: 204
Likes: 0
So what would be the likely culprit in a 87 if the throttle body and IAC have been cleaned and the base idle reset?? It idles decent in P or N but in and gear it hunts and surges from 800 to 500 and sometimes dies.
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