High Idle/ setting problem
Thread Starter
Instructor
Joined: Aug 2003
Posts: 172
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High Idle/ setting problem
I've repeatedly tried to set the idle speed on my recently rebuilt engine in an '85. Following the Chevy manual, the engine will not maintain the 'SET" idle speed. TPS and IACV are new and adjusted per manual. Could the "re-programmed" prom be the culprit? I can't see anything but black soot on the O2 sensor, so I'll assume this sensor is ok or plays no role in the high idle (1200 rpm) problem. Any ideas, please. Thanks, Jack
Race Director
Joined: Sep 2003
Posts: 16,838
Likes: 341
From: Database Error Indiana
If the O2 sensor is black it may no longer be working. Did you put in a big cam? You will have to run at higher rpm than the base idle set calls for if so. Did you try and set the idle screw in till it runs good and reset the TPS? I had to do this when I did cam/intake mods. A scan tool will really help set the idle.
