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Black smoke just means that it's starting a little rich, but no real problem. Grey smoke probably means that you have a little "cylinder washdown", meaning that you're probably leaking a little fuel when you turn off the engine. Check the throttle body injector to make sure it's not leaking when you turn off the engine. Fuel drips into the engine, washes down/dilutes any oil that's on the cylinder wall, and when you start the engine it can cause blue smoke. If the injector is leaking, it could just be dirty. Try a can of injector cleaner.

If the Chevrolet dealer installed the engine then the engine has a 3 year 75,000 mile warranty and that makes it their problem. Return to them for the fix.

2011-09-14 08:47:29
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Q: Your Chevy G20 conversion 92 van exits smokefrom muffler when you start but it disappears when you drive away you have new engine put in last year by the Chevy dealer and What should you Do to stop it?
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