Posted by Rich on 6/2/2007, 12:24 am, in reply to "Running rich" I provide many diagnostic hints in my website, look for more info there. I also can provide a very detailed diagnostic document. Rich
Link: http://www.electronikrepair.com
24.221.8.85
There can be several causes of too rich of an air/fuel mixture
- Temp II sensor providing incorrect reading (LH thinks the engine is cold, injects more fuel)
- failed fuel pressure regulator/dampener (look for fuel draining into the vacuum lines that plug into them)
- failing Mass Airflow Sensor ... note, on 1987 and newer 928s with O2 sensor, there is NO adjustment of base air/fuel mixture at the MAF (as is possible on earlier models). For Euro/ROW models without cats, there is a pot adjustment near the LH.
- failing LH fuel injection module. Rich air/fuel mixture is one of the failure modes of the LH. A rebuild is needed to fix this problem.
Electronik Repair, Inc.
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