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Strange idle issues

I have a 97 Chevy cavalier. The original motor broke a timing chain, so I replaced it with a newer motor with less than 50k miles on it. It ran great for the first 1,500 miles, then started idling funny. At times it won't start unless I feather the throttle, then it dies when I let off the throttle. Other times, when I first start it, it wants to idle around 2,500 - 3,000 rpm's. THEN, other times it's fine. What could this be?

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First of all u should have worked onthe original motor,where in during timing chain failure u have only valves bent ,which could be repaired easily.
now in this engine check the iacvalve (idle air control valve )which is responsible for irratic idle






Posted on Feb 07, 2014

  • Seth Yates
    Seth Yates Feb 07, 2014

    A compression test on the original motor showed two bent valves. Rather than tear into an engine with almost 170 k miles, I chose to replace it with one with less than 50k. Price was right, so it was a no-brainer

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95 caviler died while driving, now it will not start. Trying to start, it cranks real rough & catches hard. Any ideas?


If it has the 2.2L engine, and its has more than 60K miles on it, you may have had a timing chain jump. The tensioner for the chains breaks and allows the chain to jump time. They only last about 60-80K miles before this happens, and when it does, it usually bends valves in the head since it is an interference engine. GM knows about this and has done nothing to correct it. You need to do a compression test to confirm the problem. If it shows low compression on one or more cylinders, plan on a replacement or rebuilt head and a new timing chain set. Then either get rid of the car or plan to replace the chain tensioner every 50K miles to prevent it from happening again.

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http://www.youtube.com/watch?v=TlwB_yYMZXE

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