I guess the correct term is preignition. Years ago, we corrected this kind of thing by adjusting the timing but today that is all computer controlled. I am now thinking it might be a problem with the knock sensor, either a bad unit or a bad wire. The Check engine light has not been on since the catalytic converter was replaced and the car passed the emissions test ok. The noise still says something is wrong that could cause major damage to the engine. It still could also be an EGR problem but I have not found anything on this engine that looks like a EGR valve or controller.
Wednesday, February 15th, 2006 AT 6:58 AM