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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

 
 
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Old 06-16-2018, 09:21 AM
copeytondiesel05 copeytondiesel05 is offline
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Join Date: Jun 2018
Location: Peyton Co. USA
Posts: 1
Default 05 acceleration is slow and black smoke

I took off out of the driveway and the truck slowly accelerated with black smoke out of the tailpipe. once I was past @ 45mph the truck drove normal. any ideas???? milage is 190,000
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