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

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  #1  
Old 08-15-2011, 07:44 PM
kiesurfer805 kiesurfer805 is offline
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Default LB7 flare up after shifting

After shifting to 2nd and sometimes 3rd the engine rev's up supper quick right after the shift. I had a transmission guy look at it and he described it as a flare up. He said the fuel was trimming and the transmission was not the problem. It does not do it if you are heavy in the throttle. It also does it when down shifting. It seems to do it all the time when downshifting and off and on when up shifting.

2002 LB7 with 220K miles. Recently replaced injectors, and CP3 pump, and fuel sensor. The problem started after replacing the CP3 pump.

Any ideas on what it might be?
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  #2  
Old 08-15-2011, 08:48 PM
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DmaxMaverick DmaxMaverick is offline
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Try a fuel filter replacement.
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  #3  
Old 08-17-2011, 09:34 AM
Kennedy Kennedy is offline
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Is the pump stock, and where did it come from?

A lift pump would be an excellent addition.
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Old 08-18-2011, 04:41 PM
kiesurfer805 kiesurfer805 is offline
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The CP3 pump is stock and i got it from Oregon Fuel injector.

Is there some benefits to the fuel pump on a stock truck, in case it doesn't solve the problem?
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  #5  
Old 08-19-2011, 10:25 AM
Kennedy Kennedy is offline
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Is it a Bosch reman or is it a "house" reman?

In my opinion, every Dmax should have a lift pump.
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Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ

Custom tuning in house using EFI Live tuning software!
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