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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Re: Strange idle issues
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
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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.
I speak from personal experience here, having had it happen twice on my daughter's 1997 Cavalier.
If it has a timing chain and its slipped then there will be all sorts of trouble. It may not run, there will be lots of noise and basically you are in for a major rework. Timing chains in a well maintained engine will do upwards of 200k miles. The timing chain is kept tight by spring tensioners and oil pressure. Why do you think there is a problem? You don't say what the symptoms are? Are you sure its got a chain and not a belt?
If you have the 2.2L 4 cylinder engine, and the vehicle has more than 50000 miles, the most like problem would be a failure of the timing chain tensioner. This is a known problem and commonly occurs. Problem is, if it happens at highway speed, chances are you are going to have to replace the timing gear set, chain, tensioner, and the cylinder head as there will be bent valves. The only way to avoid this is to replace the timing chain tensioner every 50K miles or get rid of the car.
Most of the car dealers recommend to perform Maintenance services scheduled at 30K, 50K, 90K and so on. At 30K they mostly inspect all the systems, and replace fuel filter. At 60K they inspect systems and flush must of the fluids, transmission oil and filter, coolant, brake fluid, differential and transfer case fluid, and replace the air filter. Some replace the spark plus at 60K some at 100K. At 90K all timing belts are replaced, and the status of the timing chain checked. A deviation of more than 5 degree means, there it is the time ayes on the timing chain. At the Owners manual for 2005 Chevrolet Trailblazer recommend: Inspect all the systems at 25K, and replace fuel filter. Replace engine air cleaner filter, automatic transmission fluid, automatic transfer case fluid every 50K. Replace spark plugs every 100K. Maintenance Services for your car are scheduled at 25K, 50K, 75K,100K and so on. All are tune ups but they are not the same. The only concern for GM is the GM Dex-Cool antifreeze. There are some complaints regarding this product. I recommend to flush the cooling system every 50K to 60K.
Sounds like a 2.4 Quad four engine? If so the chain has either different colored links marked links that have to be aligned with the marks on the cam gear[s] and the crank gear.A chiltons book will show you how.
This is a job for the dealer or cerified mechanic. The front cover and timing chain needs to be remove to access the water pump mounted behind the engine. The pump is driven by the timing chain and timing will need to be reset using special tools.