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Jnopal77
03-19-2017, 23:06
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.

More Power
03-20-2017, 08:22
There must be one or more trouble codes present whenever the engine is in a reduced power state. Have the codes been read?

Jnopal77
03-20-2017, 18:51
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

More Power
03-21-2017, 08:19
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.