97 cavalier rough idle

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Old 02-12-07, 09:20 AM
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97 cavalier rough idle

My son has a '97 cavalier 2.2L. 135,000 miles. uses no oil. It starts instantly when you turn the key and seems to run smooth running down the road. But when coming to a stop it wants to die, or when sitting and idling it will surge up and down and want to die. I've replaced air filter, sparks plugs,pcv valve, and tried to clean inside of throttle body. It could have a vaccum leak, I will check more for that today. (I don't think theres alot of vaccum lines on this car, is there?) Any help would be appreciated. thanks kingpin1957
 

Last edited by kingpin1957; 02-12-07 at 11:30 AM. Reason: update
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Old 02-12-07, 04:45 PM
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The things you checked are the things mechanics of the 60's would check. Todays cars have all these diferent sensors that add to the mix, unfortunately. Sounds like something is causing the computer to not know how much gas to send to the throttle body.

Pull some plugs and see if they are sooted up with black to indicate the engine is loading up as if the fuel regulator is allowing the sporadic passage of too much fuel.

Until you find the answer, be careful with a situation like this that he isn't driving the car and it kills on him in the intersection when he tries to pull out in front of somebody. I was trying to diagnose a Cavalier, not that long ago, for a lady who had a similar problem and that is what her car did, and it got worse after the car ran for a while. And it would die out when you tried to step on the gas.
 
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Old 02-12-07, 04:57 PM
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Definetly sounds like a vacuum leak. There are many vacuum hoses within a vehicle. They control everything from heating and cooling, to braking. Best way to find out is to pop the hood while it is running and listen for air escaping.

If a sensor is bad, most likely it would throw a Check engine light.
 
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Old 06-06-08, 10:50 AM
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97 Cavalier Idiling Problems.

It seems to be a problem with 97 Cavaliers that when hot and sitting at idle the idle rpm drops and the engine dies. I have take my car to both dealers and private shops in order to solve the problem. The problem started at about 30,ooo miles and I havenít been able to get rid of it since. I have had the complete electronic ignition system replaced the memory module, coil, wires, spark plugs (three times), fuel injectors cleaned (3 times), and fuel pressure regulator replaced. Of all the supposed fixes the fuel pressure regulator appeared to work the longest (about 1 year). Now it appears that the crank shaft sensor is bad (according to the engine codes). every time it rains the engine light comes on however the car seems to run better this way less rough idle but it does consume more gas. So after spending about $3,000 and still not getting it fixed is there any mechanic out there that knows how to fix the problem using his knowledge of cars rather than a brainless code reader and part swapper which is costing me money?
 
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Old 06-06-08, 04:35 PM
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Originally Posted by wmiller51 View Post
It seems to be a problem with 97 Cavaliers that when hot and sitting at idle the idle rpm drops and the engine dies.
If that were true, then there'd be a service bulletin out on this and everyone would know what the common problem was in these 97's.

So after spending about $3,000 and still not getting it fixed is there any mechanic out there that knows how to fix the problem using his knowledge of cars rather than a brainless code reader and part swapper which is costing me money?
I would have driven the thing off a cliff by now. How much does this 97 blue book for? Who is the person throwing parts at this car of yours? A real mechanic?
 
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