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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 03-19-2017, 11:06 PM
Jnopal77 Jnopal77 is offline
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Default 02 Duramax 6.6 no power

02 Duramax 6.6 no power
Need advice on no power issue please. A buddy changed his fuel filter and after he changed the filter it would die on him/losing prime. I rebuilt the filter head for him. Started and ran fine except had no power. If I held the gas pedal steady the rpms would fluctuate. Took the MAP Sensor out and sitting in driveway it had all the power in the world with sensor out. Sensor was melted in metal tube. Replaced MAP with new one today. Now it won't hardly run at all.
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Old 03-20-2017, 08:22 AM
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More Power More Power is offline
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There must be one or more trouble codes present whenever the engine is in a reduced power state. Have the codes been read?
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Old 03-20-2017, 06:51 PM
Jnopal77 Jnopal77 is offline
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Originally Posted by More Power View Post
There must be one or more trouble codes present whenever the engine is in a reduced power state. Have the codes been read?
The codes had been erased before I started on the truck. I'll go read them again
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Old 03-21-2017, 08:19 AM
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The codes had been erased before I started on the truck. I'll go read them again
Even if erased, one or more trouble codes will return if the same problem exists at/after the next ignition cycle. Let us know what you see.
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