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Knock sensor trouble shooting 200 1992

posted by  someone claiming to be jorn schreurs on  Sun Jun 8 09:26 CST 2003 [RELATED]

Hi Guys,

Ok I need some help now: For many months I have been troubleshooting irregular running at low load on my 92 240 B200F LH2.4 (2ltr version of B230f) 170kmiles (today!). Tested and cleaned everything I found in the archives as a possible fault. No effect.

I think I have narrowed the fault down to the Knock sensor. I believe it is over-sensetive and retarding my timing. This is the theory, naturally I do not know this for sure. Fact is that when I disconnect the Knock Sensor the check light and code come up etc, car runs lousy, but very much with a similar irregularity as I normally experience.

I removed the KS from the block, but kept it plugged in, assuming the system would think the engine runs real quiet. Check light and code came on. Darn thing is too clever for me - well done Robert (Bosch)!! normally I do not get a check light so the KS seems to function.

Re-torqued it with no real change. I also measured the resistance over the poles - nothing. DMM goes to 20Mohm, Archives mention 4-8Mohm. Does this mean the thing is kaput?

ANY feed back much appriciated

Reg,

Jorn.


PS. Archives also mention something about using a LED to check of signal? Does this related to the older unit rather than Piezo type?






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