Low cold idle
08-31-2014, 02:33 PM
#1
Banned
Thread Starter
Low cold idle
On my 82 5 speed, if I adjust the warm idle to 750+-150 rpm then the cold idle is quite low @ 600 rpm.
If I adjust the cold idle at 750 then the warm idle is a bit over 1000 rpm.
Right now I am using a happy medium but my warm idle is at the high side of 900 rpm.
Could the air fuel mixture be off? My timing is 25 degrees, so just a 2 degree advance over stock. Maybe a bad cold start injector?
I have no smoke on start up to indicate a rich condition, but the engine has a slight hesitation when revving when cold. The revs increase with throttle input but fall below idle for a half a second before going back to idle.
This condition improves as the engine warms but never completely goes away. I have a new temp II sensor, new O2 sensor and no vacuum leaks. All lines are new and have been smoke checked.
Any suggestions? Thanks!
If I adjust the cold idle at 750 then the warm idle is a bit over 1000 rpm.
Right now I am using a happy medium but my warm idle is at the high side of 900 rpm.
Could the air fuel mixture be off? My timing is 25 degrees, so just a 2 degree advance over stock. Maybe a bad cold start injector?
I have no smoke on start up to indicate a rich condition, but the engine has a slight hesitation when revving when cold. The revs increase with throttle input but fall below idle for a half a second before going back to idle.
This condition improves as the engine warms but never completely goes away. I have a new temp II sensor, new O2 sensor and no vacuum leaks. All lines are new and have been smoke checked.
Any suggestions? Thanks!
