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Knock Sensor 700 1987

posted by  invar on  Tue Apr 23 06:58 CST 2002
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last visit: Fri Feb 26 21:00 CST 2010
[RELATED]

Well, first, check your OBD to see if it's giving you a trouble code. If it gives you 1,4,3 it means your knock sensor is broken. If not, you can remove the knock sensor and test across the two metal connectors that the plug goes into using a voltmeter. You should get around 5 megaohms of resistance. If you get something other than around 5, then your KS is dead.

I just replaced mine recently, and it can get kind of cramped in there. I didn't even bother taking it out to test for the 5 MOhms. I tested it, and I got nothing. No conduction at all. So it was definitely broken. The new one had about 5. FCPGroton carries them for cheap, around $38.

This should be covered in the FAQ as well in the Engine Tune and Performance section. Look for the word 'knock sensor' on that page and it should tell you something like what I just told you.

Good luck!
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'






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