Quote:
Originally Posted by mults
A buddy of mine at work has a Gran Prix and his gauge is showing a knock on a particular cylinder consistently. When the computer senses this knock, it retards the timing and the car runs rough. It turned out to be a loose motor mount, and his header was hitting something causing the knock sensor to "believe" that this cylinder was misfiring.
The sensor cannot determine if the noise is from an actual "knock" or an external noise so there may not be anything wrong with the sensor. May not be the problem here, but something to consider...
|
Very true. Had a customer Acura MDX one time that would start and stall/stumble repeatedly. Front mount so worn that the whole engine would rock and then slam down and the vibration would set the knock off and retard timing just as the engine is starting.