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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 12-08-2015, 07:29 PM   #1 (permalink)
bulldog95
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LBZ Duramax help!!

I purchased a lbz duramax a couple of months ago. I just changed the fuel filter today and went to start truck and reduced engine power message came up with no check engine light. What could be the possible problem?

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Old 12-09-2015, 08:53 AM   #2 (permalink)
Ramblinrodney
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I take off my intake tube to change my fuel filter. If you did this did you plug you MAF sensor back in? Another thing is do have a washable, air filter? If you do replace it with a dry filter. And clean your MAF sensor with MAF cleaner. If this is your first fuel filter change on a diesel you may won't to retrace all your steps to make sure it was done right.

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Old 12-09-2015, 09:04 AM   #3 (permalink)
bulldog95
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It did have any codes. There was no check engine light. Only reduced engine power message.
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Old 12-09-2015, 09:06 AM   #4 (permalink)
bulldog95
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Will try changing air filter and cleaning maf sensor.
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Old 12-09-2015, 01:50 PM   #5 (permalink)
enahs
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I presume that you have primed the new filter and that the gaskets are in properly.
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Old 12-09-2015, 03:03 PM   #6 (permalink)
bulldog95
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Installed new filter, loosened bleeder screw and pumped till diesel came out. I closed it and then started truck.
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Old 12-09-2015, 07:10 PM   #7 (permalink)
callie454
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Is it possible that it's got a code stored and no CEL for this condition?
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Old 12-09-2015, 07:16 PM   #8 (permalink)
bulldog95
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Check with code reader and there was no code. Only had the message.
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