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CEL - knock sensor - running lean? 900 1993

uid 6573's pic
posted by  javalion on  Tue Jul 28 03:43 CST 2009
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last visit: Wed Jul 23 09:57 CST 2014
[RELATED]

Correction in my post. Where I said red wire I meant to say green.

Contrary to the Volvo publication, the FAQ says other issues will cause the code but that may be the differences in Rex/Regina and LH2.4 or the publication shortcuts potential other cause for the code. I do not trust the publications to the letter. It is is possible but hard to believe the code is the result of its self testing only.

Per the FAQ:
Cheap gas and heavily carboned engines may cause misfiring to the point that the knock sensor signal is not believed by the ECU. Wiring and the knock sensor itself are by far the most common sources of knock sensor problems. [Les Daniels] If this piezo detector fails, it goes open circuit and the ECU 'thinks' that a massive retarding of ignition called for - hence the drop off in performance. On carb models there can be backfiring as well.


Check the wiring and the connections and as both you and Spook mentioned, chase down anything that would cause the car to run bad.

Tom






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