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Duramax Fourth Generation: 2007.5-2010 (LMM) Discuss the fourth generation (2007.5-2010) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old Yesterday, 03:30 PM   #1 (permalink)
Lmm2400
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Lmm losing power with no codes

I have an 09 lmm, egr is fully deleted. Tuned with efi live and dsp5 switch. The vanes were sticking at 100% and when I would be driving over 50 mph it would start losing power add wouldn't let me accelerate at all. It wouldn't throw any codes but if I cleared codes it would fix the problem. Sometimes for less than 30 seconds. Sometimes for an hour. I replaced the vane position sensor and the vanes are working correctly note but I still lose power with no codes.

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2009 lmm duramax
egr is fully deleted, fass 220 lift pump
Tuned with efi live and dsp5 switch

Last edited by OkDually; Yesterday at 03:34 PM. Reason: prefix/sig
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Old Yesterday, 03:32 PM   #2 (permalink)
jakep4401
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Originally Posted by Lmm2400 View Post
I have an 09 lmm, egr is fully deleted. Tuned with efi live and dsp5 switch. The vanes were sticking at 100% and when I would be driving over 50 mph it would start losing power add wouldn't let me accelerate at all. It wouldn't throw any codes but if I cleared codes it would fix the problem. Sometimes for less than 30 seconds. Sometimes for an hour. I replaced the vane position sensor and the vanes are working correctly note but I still lose power with no codes.
Mine looses power under hard acceleration. I have been told a lift pump will fix it. I just had mine deleted and had the dsp5 switch installed also.

Sent from my SM-N960U using Tapatalk

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Old Yesterday, 03:35 PM   #3 (permalink)
Lmm2400
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I have a fass 220 lift pump. It'll do it with my cruise set it just driving any time over 50mph
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Old Yesterday, 03:37 PM   #4 (permalink)
jakep4401
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Originally Posted by Lmm2400 View Post
I have a fass 220 lift pump. It'll do it with my cruise set it just driving any time over 50mph
Yea thats odd. Did the lift pump make yours not loose power under acceleration anymore?

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Old Yesterday, 03:38 PM   #5 (permalink)
Lmm2400
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It did fix that problem, it also used to tell me to replace my fuel filter after hard acceleration but the lift pump fixed both those problems
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Old Yesterday, 03:40 PM   #6 (permalink)
jakep4401
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It did fix that problem, it also used to tell me to replace my fuel filter after hard acceleration but the lift pump fixed both those problems
I was quoted too have a airdog 100 put on at a nearby diesel shop. They quoted me 900 for the parts and labor. Do you think i would come our cheaper buying the unit myself and having someone install it ? I just fell like 900 is still a little high but idk. I found a fass lift pump for $550 but i have heard the airdog is good also.

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Old Yesterday, 03:45 PM   #7 (permalink)
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I was quoted too have a airdog 100 put on at a nearby diesel shop. They quoted me 900 for the parts and labor. Do you think i would come our cheaper buying the unit myself and having someone install it ? I just fell like 900 is still a little high but idk. I found a fass lift pump for $550 but i have heard the airdog is good also.

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Ok so i cant find the fass lift pump i was talking about but i can get the airdog 100 for $560 on ebay. I just wonder if i would come out cheaper buying it and having a shop install it. Or how hard is it too install yourself ?

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Old Yesterday, 03:50 PM   #8 (permalink)
Lmm2400
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I put mine in myself, it wasn't very hard at all
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2009 lmm duramax
egr is fully deleted, fass 220 lift pump
Tuned with efi live and dsp5 switch

Last edited by OkDually; Yesterday at 04:58 PM. Reason: sig
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Old Yesterday, 04:57 PM   #9 (permalink)
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Quote:
Originally Posted by jakep4401 View Post
Ok so i cant find the fass lift pump i was talking about but i can get the airdog 100 for $560 on ebay. I just wonder if i would come out cheaper buying it and having a shop install it. Or how hard is it too install yourself ?

Sent from my SM-N960U using Tapatalk
You can install a Kennedy Single or Dual lift pump kit yourself a lot cheaper
https://www.kennedydiesel.com/catego...bCategory2=125
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Old Yesterday, 05:05 PM   #10 (permalink)
jakep4401
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Quote:
Originally Posted by OkDually View Post
You can install a Kennedy Single or Dual lift pump kit yourself a lot cheaper

https://www.kennedydiesel.com/catego...bCategory2=125
How are they compared to airdog and fass?

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