it has been almost a year and it poped up again i have the dealer replace the coil pack spark plugs and wires as well as the nock sensor map sensor and the maf still no cure. i am at a loss because it still throwes a code. i am wondering if the cat is going bad to cause it but i dont want to throw unneccesary parts on the car and not fix the problem. so far i am at a loss because it is only throwing a code on one cylender insted of two or three like i had a while back. if some one can help it is apreciated my monte is a 7th gen 3500 vvt flexfuel. this is what has been done so far new fuel filter new coil pack and wires and plugs and a new air filter with all new fluid in the engine and trans also new fluid in the radiator. i am at a loss on why there is a missfire on cylender 2

 

There could be a piece of debris in that cylinder that is creating a hot spot. I would do a compression test (just to check) followed by looking directly into the cylinder to see if anything is off. It could even be a cracked valve seat. The fact that only cylinder #2 has developed the knock, gives you a great starting point. I am not over familiar with e3 spark plugs. Are they pre-gapped? You may also want to replace just the one spark plug, in case you got a bad one. Good luck.

 

i was told by the dealer and was billed for a pressure test and had them check the valves again. because i had head gasket problems do to a recall for our v6 7th gen models. i had them replace the spark plugs when it was at the dealer but knowing my luck they build me and didnt do a f&*$ thing. right now i am looking for anouther shop to look at it. because i have anouther 100k mile warrenty and it should be covered by it. if anouther shop finds some thing wrong

 

oh the e3 comes pregaped right now i will be at work till monday before i check that cylender again as in put in anouther plug in and swap the wire.

 

Good luck and let me know.

 

hay millermontess i changed out that spark plug. it cracked a little at the part where the spark plug boot and the spark blug meet and giving a grounding out. i am glad it wasent serius

 

i think it was hust a bad plugwhat i mean is make a thousand and have 1 or two of them get goofed