Question about 2005 Chevrolet Aveo

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Wow I thought I was the only one with this problem with a 2004 Optra 5. Some times my engine will run on after the key is taken out. This problem stops after either stalling the car or opening the door. I would really like to know what this is because I had this problem, and my car died after not being ran for a weekend. I charged the battery. Things seemed to be back to normal but now its back again. Help would be amazing. Thanks.

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This is called dieseling and is caused by poor combustion of the fuel. What happens is the fuel causes carbon to build up in the cylinders. This carbon retains heat and when the mixture (air and gasoline) are compressed, this carbons glowing hot causes the mixture to predetonate before the spark plug fires.When you turn off the key, all that does is remove the spark from the plugs and power to your fuel pump (you may have a mechanical fuel pump instead.) However, your car still has some fuel left in the reservoir and the final turn of the engine sucks some fuel into one cylinder where the glowing carbon fires that cylinder, which draws some fuel in to the next cylinder and so forth untill the fuel left in the reservoir is exhausted.

As I said this can be caused by carbon build up, or it could be caused by using low octane fuel in a high compression engine. The later is usually indicative of using low octane in an engine designed for high octane fuel. In your case, I suspect that you have gotten some lousy fuel from a shady service station.

One test you can perform is to put a half tank of high octane and a half tank of low octane and see if the dieseling goes away, or if your car is suppose to use high octane, then use high octane

This dieseling really does not hurt the engine, but it causes you to get low milage as the engine is not combusting the fuel efficently.

Some auto mechanics will try to sell you an engine flush for between 200 and 300 bucks, that is suppose to get rid of the carbon build up, but my opinion is that it is mouse milk.

Posted on Dec 30, 2010


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