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View Full Version : Knock on CEL coming on, when knock sensor isn't even connected!


tryingbe
03-02-2012, 01:41 AM
LM V12.5. 87 TII wiring.

My knock sensor is not connected to the wire. Why would the CEL come on and flash like it is detecting knocks?
shackwrrr
03-02-2012, 07:22 AM
LM V12.5. 87 TII wiring.

My knock sensor is not connected to the wire. Why would the CEL come on and flash like it is detecting knocks?

Ground the wire and see if it still does it. Sometimes noise or interference will set it off.
RoadWarrior222
03-02-2012, 08:38 AM
If the connector is rattling free there's a capacitance effect that can occur, dunno if you've ever had a jack plug lead hooked into an amp and tapped the end of it and heard the amp pop, well a similar thing could happen on your knock connector. Grounding across it would also stop this effect.
GLHNSLHT2
05-05-2012, 09:12 AM
My old T-top daytona would flash the CEL and Pull timing when I switched from High to Low beams on the headlights! :)