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CEL - knock sensor - running lean? 900 1993

posted by  dinomartino on  Sun Jul 26 16:49 CST 2009
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last visit: Fri Oct 24 04:43 CST 2014
[RELATED]

Non-turbo car, Regina.

Have had an intermittent problem with a CEL and a 1-4-3 code. Sensor has been replaced and is properly torqued, electrical connection has been cleaned, wire is routed away from alternator and has a ferrite core mounted on it to help mitigate RF interference. Wire routing and the ferrite helped for a long time.

Today, this got more severe. It comes back promptly after being cleared. There are NO other codes.

I am starting to suspect the fuel supply may be compromised, causing it to run lean and leading to detonation under certain conditions. At 120K, it's on the early side for the pump to fail, but the fuel filter is old, probably original. The car doesn't stall, doesn't hesitate, but does not have much power and acceleration is lousy (even before CEL comes on).

Thoughts?

John





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