CP3 failure? - Diesel Bombers



Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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Old 06-18-2011, 10:54 PM
The Don's Avatar
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Default CP3 failure?

My beast is now giving me a lope when I come to a stop. The light gray smoke at the lights after a 50 mile drive and requires a hard acceleration to clear. Still showing no codes. The dealer double cheked the balance rates again, and fuel pressure fluctuates between 21K and 23K PSI. Dealer said pressure is in the normal opperating range. Hmmmm?? Any thoughts?

---AutoMerged DoublePost---

Ok over 30 people have read the post and nobody had any thoughts. This site doesn't appear to be as helpful as was suggested to me.

Last edited by The Don; 06-18-2011 at 10:54 PM. Reason: Automerged Doublepost
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Old 06-19-2011, 07:41 AM
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still sounds like bad injectors to me

Find another dealer, injectors max tolerance is +/-4 in park and +/-6 in gear, if they are out of that spec then they are damaged, on my LBZ they rarely ever go more than +/-2 in park
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Old 06-20-2011, 04:32 AM
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I have some tech articles that describe and help diagnose a bad cp3 posted up somewhere on this site, it has been moved fro, its original so you will have to search through the multiple threads I have made.

Basically if there is a flucuation that's real bad it could be theredulator on the back of the cp3. But that's not said in stone. If i had a working computer I would be more able to help you out and direct you to the correct tech post.
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Old 06-20-2011, 04:34 AM
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You can click on the link here and it will show you all my threads, the majority are tech.

https://www.dieselbombers.com/search...&starteronly=1
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Old 06-21-2011, 11:48 PM
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I do appreciate the link some of your posts I wasn't able to find without it.
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