Rough Idle 87 Carrera
04-07-2003 | 03:49 PM
#1
Thread Starter
Intermediate
Joined: Jun 2002
Posts: 34
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From: Illinois
Rough Idle 87 Carrera
I'm confused now. My car idles at 880 as it should for 20-40 seconds, then drops to a rough 600 and stays there. A tap of the throttle starts this all over again.
I've tightened manifolds, put in a new Distributor cap, rotor and plugs, put in a new oxygen sensor, and then gone through the "bridging B & C" and adjusting the air bypass screw. None of this changes the idle after those initial 20-40 seconds.
When the idle microswitch is disconnected, the idle jumps up to 1200-1300 as it should, so that seems OK.
What sensor input is considered by the DME at 20-40 seconds after the idle switch is activated? If the head temp, speed or air sensors are bad, why does the car run well in every other way?
Help!
I've tightened manifolds, put in a new Distributor cap, rotor and plugs, put in a new oxygen sensor, and then gone through the "bridging B & C" and adjusting the air bypass screw. None of this changes the idle after those initial 20-40 seconds.
When the idle microswitch is disconnected, the idle jumps up to 1200-1300 as it should, so that seems OK.
What sensor input is considered by the DME at 20-40 seconds after the idle switch is activated? If the head temp, speed or air sensors are bad, why does the car run well in every other way?
Help!