I have trying to fix this error for about 6 months now. I have replaced:
both knock sensors with the correct one (part number ac delco 213-268)
checked the wiring from the sensors all the way back to the PCM
replaced the PCM
even bypassed the wiring of the car and used new wire - running it from the sensors directly to the pcm.
I am still using the original PROM from the old computer. Using a scan tool meter, the PCM will see a knock sensor signal around 3,000 rpm or higher - but it isnt a constant signal. Knock retard will go to 10 and stay there. Starts off a 0.
I was thinking about getting a new PROM flashed with the latest software to see if this might fix the problem, but I am all out of ideas. Hate to take it to a dealer and have them replace all the stuff I have already replaced and charge me a few thousand dollars. It has to be something simple I am missing.
Saturday, April 28th, 2012 AT 8:15 PM