LLY: 05 duramax wont accel over 2000 rpm?

[burgess.jase7291]

My duramax recently started an issue where it won't get over 65mph or 2000rpm and it looses all power until I let of pedal...as long as u baby it or keep it under 2000 rpm it seems fine . Anybody else ever had this issue...Changed all my filters today and exact same thg

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[roxyfever]

Sounds like a fuel limp mode. Any codes?

 

[minerigger]

Mine did it when I changed turbos. MAF sensor had to get seriously rescaled. If it's tuned via efilive I'd log it and send it to your tuner

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[burgess.jase7291]

P1098...fuel rail pressure low while power enrich...doesn't have a tuner on it yet...just bought it...I'm gonna check frp today and run injector balance test but this is my first duramax. Hoping I don't regret it

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[burgess.jase7291]

Sounds like a fuel limp mode. Any codes?

I believe 100% it's fuel limp mode. P1098 code and 2 egr codes

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[Lparrill]

Bet it's the fuel pressure relief valve. They get weak and go bad.

 

[burgess.jase7291]

Bet it's the fuel pressure relief valve. They get weak and go bad.

Where's it located on the 05 lly

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[onebaddmaxxx]

Frp low during power enrichment should be a p0093 code. P1098 is for o2 sensors on gas trucks.

I would pull the small rubber loop on the back off the driver rail and see if fuel comes out in a test drive. If so your relief valve is bad.

 

[burgess.jase7291]

Frp low during power enrichment should be a p0093 code. P1098 is for o2 sensors on gas trucks.

I would pull the small rubber loop on the back off the driver rail and see if fuel comes out in a test drive. If so your relief valve is bad.

Small rubber loop?

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[onebaddmaxxx]

Look at the back of the driver rail you will see a rubber horse shoe hose. Pull it off and see if any fuel is in there

 

[carl.swoyer]

Got that when the #2&#7 injectors shorted. It was a recall on the 05 lly

Carl & Christine, 2012 Landmark Rushmore, 2005 Silverado crew cab lt 8 foot bed 6.6 lly /Allison -custom dual exhaust-198000 miles !

 

[carl.swoyer]

Also had a bad fuel rail pressure solenoid.

Carl & Christine, 2012 Landmark Rushmore, 2005 Silverado crew cab lt 8 foot bed 6.6 lly /Allison -custom dual exhaust-198000 miles !

 

[onebaddmaxxx]

There's a million things it could be

 

[burgess.jase7291]

Look at the back of the driver rail you will see a rubber horse shoe hose. Pull it off and see if any fuel is in there

Ok I found it...if I bottle test it and there is a large amount or any fuel in the bottle what would be the culprit or is there many things to cause this

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[burgess.jase7291]

I found out its my cp3

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[burgess.jase7291]

I have a good LB7 cp3 trying to figure out if it will work on my lly

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[WVRigrat05]

Yes it will work. They will all work 01-10, only diff is some minor inner parts and the fpr on the 06 up, but they all inter change

 

[burgess.jase7291]

Yes it will work. They will all work 01-10, only diff is some minor inner parts and the fpr on the 06 up, but they all inter change

Thx for the info...do they have a gasket or o ring of any sort I need to pick up before R & R

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[CaptPhil]

Thx for the info...do they have a gasket or o ring of any sort I need to pick up before R & R

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nope, shouldn't need anything unless you tear an o ring.

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[burgess.jase7291]

nope, shouldn't need anything unless you tear an o ring.

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Thx for the info

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