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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
I had a similar situation with the hot idle AFR going rich like around 12:1 and idle speed going high out of the blue a couple months ago.
Turned out the rear fuel pump relay coil windings took went bad and the car was running on the front fuel pump only.

The WUR and AAV heater elements also get their power from the rear fuel pump relay so they stayed cold and acted like the motor was on a real long cold start.

Put in a new relay and everything went back to normal.
Old 06-19-2010, 08:03 AM
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