Question about 2008 Chevrolet Uplander

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Tapping under hood constantly and speeds up when accelerating

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Sounds very bad, if you drive it more like that the engine could fail completely. Its possible the big end bearings banging because you did not put enough oil in the car at some time in the past.

Posted on Dec 28, 2013

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SOURCE: 2004 chevrolet colorado - is

need new plug wires and spark plugs

Posted on Mar 01, 2011

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Tapping from upper left area under hood


Replace the egr, or if you want to be sure, have a friend give it gas ( unless you are familiar with the throttle body) while you listen under the hood. You should be looking between the firewall an engine. Once you locate it, you will know if your tapping is coming from the egr. Could be that something is touching a fan, or even the cv joint (would get worse during turns). Best bet, get under the hood and check it out. If the egr code is coming up, it needs to be replaced.

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What speed are you going when it chugs?
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So does the a/c still work, maybe your compressor is bad? Top off your oil and run the engine and see if you can find out where the oil came from?

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It sounds like you have a rod problem. If that is the case the engine will need to be taken apart to be fixed. Price varys from shop to shop but they can do a bunch of tests on it and tell you exactly what is wrong with it for about 80 to 100 dollars

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