I've got an 84 Pontiac Firebird (garage queen with 130k mi) that has annoying ping/clatter/knock at light throttle accelleration. In fact its' pretty much had it for years now. I've recently performed a tuneup including O2 sensor. Couple years ago the TPS was replaced. Everything appears to be mechanically in order.
I wanted to investigate the EGR and Knock Sensor next. My Haynes book only references a Knock Sensor but no details.
Q: Does this car/engine have a Knock Sensor to aid with electronic spark control? (It does not have a vacuum advance - only the wired (electronic?) advance cntrl to the distributor)
Q: If it does have a sensor - Where is it located and How do I Check/Test it?
Q: If it does not have a sensor - how does the ECM 'know' when to advance/retard ignition timing?
thanks