LBZ: Lacks power, revs up and goes nowhere.

[Dmax1989]

Just wondering if I actually have a issue or not? When i go to pass someone on the highway, the truck feels like its doggin it. Even up to 3000rpm its pretty pathetic. I have about 50% left on the life for the fuel filter, im running howes diesel treat every tank, ppe on level 2, air filter is alittle grungy but nothing plugged up. Any thoughts? I was thinking maybe the torque converter was slipping?

[TSBowman]

Mine was doing the same thing recently. all it took was a fuel filter change(My remaining filter life was at 50%)


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[Dmax1989]

Ok ill give it a try, i must be getting some bad fuel from the station. Im running a racor filter right now so it must be filtering better than the oem one!

[skmct]

As I under stand it the fuel filter life indicator is based on mileage only. So if you got some crappy fuel somewhere it has no way of knowing. Cut the filter open have you change it and have a look see.

[Dmax1989]

Ill do that tomorrow and post some pictures. I picked up 2 fleetguard filters today but didnt get a chance to swap it out yet. Im sure this will solve it, my 05 had a similar problem and it was a super dirty filter. Hope this is the same!

[woodchuck2]

Yup, plugged filter. Surprised when hammering on it the engine does not try to quit. There are times when mine will rev up and then flat out fall on its face, always a bad filter when this happens and sometimes with only 5k on the filter.

[Dmax1989]

Just changed it, the old one open and it was hardly dirty. Not even dirty enough to post a picture of. I might check the air filter yet, maybe see if my tranny level is down. Would unloading and reloading the tuner help at all?

[heymccall]

LMM and LML engines rate filter life on actual performance.

I chased one with the same issue (step out to pass and it would fall on it's face) BUT it would zero the fuel filter life, and it had a leak in the filter head.

Another one I chased had a stuck EGR valve and plugged EGR cooler. Cleaning the cooler (off the truck) and cleaning the EGR valve cured it.

And a 3rd LMM, same complaint, ended up having a section of fuel line collapsing under load. Cut out and replaced the hard plastic (kinked from install) line at the rear of the driver's cylinder head, with reinforced rubber hose, per GM's bulletin.

The first and third ones also gave up a P0087 code.

[Dmax1989]

Well i cleaned the air filter as well as it was very grungy looking, and i took the ppe out and reloaded it. It seems to be alittle better but not as i remember. Guess thats the trouble of driving highway continuosly and driving like a old man. I checked the tranny fluid tonight after a drive and its about 1/2" lower than the bottom mark for the hot level. Could this be the culprit?