Nobody said to put it in the fuel

 

Thanks guy's I'll give it a go, Larry

 

Nobody said not to either - or where to put it. Your recommendation could have easily been taken out of context because you were discussing cleaning out carbon.

 

Alright, - Yea I don't know what else it could be other than what's been mentioned in this thread. Could run a compresion check to see if it is indeed on the high side. If over 100,000 miles, I would change the forward O2's.

 

If it pings just as bad with premium gas, you think the knock sensor could be fouled or something?

 

Or there's a few 7mm, 8mm sockets, extensions or whatnot riding along side the knock sensor lol. Maybe it's loose ? In-fact, I replaced my knock sensor harness on my 98. The wires chafed right before the connector. The insulation dried out to a point it was brittle, - bared the wires and was only hanging together by a few copper stands before I caught it. Might be worth checking the harness anyway. Or at-least looking down in that valley on top of the block behind the alternator, - the knock sensor COULD be submerged in coolant or water.

 

However, wouldn't a bad knock sensor throw a code?

 

Not sure, never heard of one going bad before. I'm not sure there's a DTC for it..? Honest lol.

 

P0325 Knock Sensor 1 Circuit Malfunction (Bank I or Single Sensor)
P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
P0327 Knock Sensor 1 Circuit Low Input (Bank I or Single Sensor)
P0328 Knock Sensor 1 Circuit High Input (Bank I or Single Sensor)
P0329 Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)
P0330 Knock Sensor 2 Circuit Malfunction (Bank 2)
P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)
P0334 Knock Sensor 2 Circuit Intermittent (Bank 2)

 

Yea, guess there's quite a few. Here's a few links for Brew8-

http://www.dnd-automotive.com/tuneup/spark-knock.htm

http://www.aa1car.com/library/spark_knock.htm

http://www.misterfixit.com/deton.htm

 

Thanks guys lots to check and try, I could check a few cylinders just to sample the compression, lots of miles though 136K, nice discussion, thanks again, Larry