Question about 2002 Pontiac Montana

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Engine was knocking loudly and then stopped

I Have a 2002 Pontiac Montana 192,000+ miles It had a knocking noise that sounded like a bad lifter. I had someone look at it and he said that it was a cracked rocker arm. I aske him if it was safe to drive it home and he said yes it was. Then on the way home it stopped running and wouldn't start. I heard a loud noise and thud when it stopped... I took off the oil cap and had a friend start it. The lifters and valves were not moving. The same "friend" said that if nothing was moving then it was probably the timing chain. What I want to know is..... Is it the timing chain or is it something else. What can I do?

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When the timing chain goes if the valves are fully open they won't clear the pistons (likely the loud thump you heard) when they come to TDC. Likely looking at a full blown valve job now, make sure it didn't crack or warp the heads in the process. With 192,000 miles on it it was probably due for one anyway. Easiest way is to pull the heads off the block and send them in for a machining and valve train replacement (about 4-$600.00 if you DIY.

Posted on May 10, 2009

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Yes sounds like timing chain, but if something snapped it could have busted the cam itself too only way of knowing is too take it apart good luck

Posted on May 10, 2009

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