i just purchased a 19 suburban LT 5.3. bought is used drove it several days all good then got an knock sensor code, then cylinder 4 misfire. now when i put it in reverse feeling a vibration that seem to do away after i accelerate. my research is leading me to changing the spark plugs, wires and coil pack, which may be causing the rough engine triggering the knock sensor. any help ,advice,or pointers would be grateful, i am planning on doing the plugs , wires, and coil packs myself.

 

Welcome to Chevy - how many miles on your new ride and do you have any previous maintenance history?

 

242000,and no , i might do the carfax .

 

With that many miles I agree with your plan of attack!

 

do you think it worth the time and investment to do the Knock sensors?

 

thank for all thein put, turn out 0 compression on cylendar4, putting a new motor in it.