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Smoke when starting 2004 Chevrolet Colorado?

I have a 04 Chevy Colorado, here lately it smokes when I start it, the weird part about it is that it doesn't do it every time. It can go days without doing it. I have noticed also that it misses, but again this is not a problem happening all the time just once in awhile. I have been told it could be the value seals leaking but no one understands why its not doing it all the time. Any suggestions? I really hate to take it to a dealership and pay all the money if its a simple fix! Thanks :)

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what color is the smoke?

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What size engine is it and what type of transmission (AT or MT) Is your oil consumption up? Any service lights on?

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well the smoke is white/blue. Its a automatic and the engine size is a 5 cylinder? if that helps. Also the engine light comes on, but then goes off. Had computer read but it only said multi. misfires. And yes the oil consumption is up

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Sounds like you are starting to burn some of your oil. I'd start with a compression test and/or a leak down test. You pretty good with tools and working on those engines?

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could this also be water vapor?

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First take it to an AutoZone and request a free computer read out. This may help you to pinpoint the problem.

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Autozone can give you a place to start, but you must realize that codes given only tell you the symptoms not the cause. Misfire codes indicate that a cylinder(s) are lacking air, fuel or spark. Your job is to find out which. Compression and leak-down tests are good ideas. Also check the coil(s) and the fuel system. I'm not sure this one can be qualified as a simple fix. You should seek professional help. A good mechanic, not necessarily the dealer, will help you out but it could be expensive. Good luck.

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