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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
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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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Old 06-16-2018, 10:04 AM
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DmaxMaverick DmaxMaverick is offline
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Join Date: Apr 2001
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Welcome aboard!

Check for codes, active and history. If the SES lamp is on, there will be active codes, and likely more in history.

Could be air cleaner or MAF fouling. Clean and/or replace either.

Could be a PCM glitch. If it doesn't repeat, don't sweat it.

Could be an early indication of turbo vane fouling. It's more common with power adding programs, but can happen with any of them over a lot of time/miles, especially high loading. Cleaning and exercising the vane and servo (Tech II required) usually fixes it for a while (until it fouls again), but wear requires closer exam and repair.
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