do codes exist if no check engine light?
#1
do codes exist if no check engine light?
I am getting a sharp infrequent skip at idle.
If its a coil pack problem, and my check engine light has NOT come n, can the auto zone code reader find it or do I need to wait til the light comes on, and how long will that be?
If its a coil pack problem, and my check engine light has NOT come n, can the auto zone code reader find it or do I need to wait til the light comes on, and how long will that be?
#2
If its a coil pack dying slowly, the check engine light will not come on unless it misfires for a long sequence for the computer to detect. You would have to leave your car on with it in drive and your parking brake up and disconnect one by one. You will then find the one that is misfiring.
#4
#5
I believe only a Knock Sensor code can exist w/o triggering the CEL.
#6
I know for sure the knock sensor will not trigger the CEL, but I'm not sure if it's the only one that can do that.
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