1994 GMC Sierra Repair Question
Mileage: 265,960 miles.
Code 43
Asked by kristinvanvalkenburgAnswer
it is a knock sensor issue. it could be the wiring, connector or the sensor itself.
if you have a scan tool, monitor the timing and then tap on the top of the motor with a hammer and it should retard 4 degrees.
Roy
Knock sensor is new, would the diagnostic test read a bad knock sensor? Like show up as knock sensor?
Its already retarding at 4degrees too
a code number never identifies a bad part, just a failed system.
if the timing is 4 retarded, disconnect the sensor and see if it advances to where it should be.
Roy
It came to a steady 4 degrees , then i pressed the gas and it jumped again ffrom 4 to 2 to 3 to 4
how did you know is was 4 degrees retarded if you dont know where it should be??
4 degrees before top dead center is the spec.
Roy
Its just stopped at zero
how did you check the timing and when did you check it??
Roy