Ok, I have tried everything else so here goes. From the beginning. I noticed that when my car was at a red light and I had the break pressed it would idle roughly, I could tell from the viberations didnt have a rythem. I took the car to advanced and The told me after scanning with ODB2 computer that o2 sensor was bad and I had a miss fire on cylinder number 4. (The car is a 2002 Olds alero 2.2 Ecotech engine) So I figured that the 2 were related. My car was due for a tune up anyway so I purchaced new plugs wires O2 sensor "upstream" before cad converter. Installed all no change with Idle. Still was getting misfire cylinder number 4 and bad O2 sensor "figured down stream". Well before I could replace it I was driving down the road and car acted like it ran out of gas. Thinking fuel filter I replaced it, Still no start. While cranking my car to see if it would starn I heard a funny sound under valve cover. So I removed the valve cover and had a friend crank it. In my disbelief I watched as the chain between the DOHC would get slack then loose it get slack and loose it. So I removed the timing cover and found black plastic parts inside that were broken. Turns out it was the timing chain guide and a small piece of it had gotten down between the sprockets and it was being grinded on. Replaced the whole set and no matter how many times I set it It keeps jumping. Honestly I think I just figured out my own problem there is still a piece of plactic in there somewhere causing all ths, because nothing else makes sence. Yes I remembered to prime the tensioner.
have the same problem?
Sunday, May 12th, 2013 AT 7:04 PM