Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

6.5L Puffing Black smoke when accelerating

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Old Jul 4, 2011 | 10:59 PM
  #1  
coobzy's Avatar
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Default 6.5L Puffing Black smoke when accelerating

Also very hard to start when cold. My guess is glow plugs injectors and air filter. Any thoughts?

Thanks in advance.
 
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Old Jul 4, 2011 | 11:29 PM
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From: Reddick,Fl.
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air filter ,exhaust leak will do it
 
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Old Jul 10, 2011 | 08:33 AM
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Mine was doing that too. Found a cracked vac line going to the wastegate. Fixed that and I get a small amount of black smoke when I initially hit the accelerator but clears up quickly. Much better now.
 
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