1989 Spark Knock

[JKeyt]

Anybody familiar with resolving spark knock at moderate load. Vette other wise runs great. \\

PS...don't hear the knock when engine is cool

 

[Rob]

Moving to the C4 Technical Discussion forum...

 

[c4ever]

Knock sensor,ESC module,octane,timing,fuel delivery are all common fixes. Get your hands on a GM service manual and go through the diagnostics. It'll save you $$$ on what you don't need.

Carlo

 

[c4fan]

My 87 suffers from spark knock when the engine reaches over 200 degrees. I bought the car in Jan. of this year and other than idling a little rough it ran fine. I tuned it up in June and found out the timing was off a little so I reset the timing and had no problems until the summertime heat and the car began to ping. The MAF sensor went bad which caused a major pinging problem but since replacing the MAF sensor the car only pings above 200 degrees. Not owning the car last summer I don't know if it was a previous problem or not. It gets frustrating. I put a new knock sensor in it and it still pings when hot so last week I bought a digital tester so I can check all the electronics that may cause this. I don't know if this a common occurence with TPI vettes but I'm sure other CAC members can help out. I'm going to go with a 180 thermostat as soon as I get a new chip and I believe it should help some.