check engine lite= knock sensor

[sleepertruck72]

Originally Posted by suville

as the title indicates my check engine lite came on, scanner says knock sensors ok replaced them... within a few miles engine lite again scanner says knock sensors ok well we didnt replace the wire harness first time so replaced wire harness within a few miles engine lite again mechanic say "it a runability issue" ???? ok replaced spark plugs noticed a slight difference in response yup within a few miles engine lite again. WTF Im thinking I could have a knock sensor that is defective but ??? At 95 bucks an hour for shop rate this is getting expensive and Im getting pissed ! Anyone ever experienced this situation and have any recommendations?? Im at a loss as to what the hell is going on with this confusor crap any advise or recommendation would be most appreciated. Thanks

I agree with previous responses. Use GM knock sensors and harness. Although cheaper in price, Aftermarket stuff seems to never work. Also, I would recommend replace the intake valley cover gasket while youre there already. There is a GM bulletin that says to use engine sealant/silicone around the knock sensor to keep water out of the knock sensor.