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Stoped up air filter. Check it and if it is okay then you need to ask your question again with The year,engine size, and model so that will help us answer your question alittle better. THANK YOU.

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Q: What causes diesel engine to smoke exesively?
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What causes diesel engine to smoke exesively you have a 2003 Chevy truck 2500hd 4x4 6.6 diesel?

in appropriate injector's, clocked injector nozzle's, injector pump diaphram ,(due to dirt fuel)


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