I have a 2004 an a half LLY that does not want to accelerate when starting off and I am afraid I am going to get hit because it doesn't want to get out of its own way. After about 200 feet it will accelerate . Could anyone offer any suggestions as to what might be causing this.
lag in acceleration on my LLY
- Thread starter DieselD1
- Start date
I would start by checking the MAF, MAP, BARO, and any air and engine temps to make sure they reflect the conditions where you are. If your ECT says the engine is -300*, your ECM will not correctly fuel the engine, as an example. If everything there is A-OK, then I would look at anything related to boost. You might want to determine what RPM this happens or if only speed related.
Mine how ever did… 2004.5 ext 3500 lly slt.. I was about 45 mins away from home did a burnout in it (yes I know they don’t like it but just telling you guys the truth here haha so please don’t get angry with me help me if anything) I was about half way into the trip and I stepped on it enough for it to boost for a couple seconds and heard a pop. I looked at my buddy and said what was that. I didn’t notice any difference in the truck it still took off fine and went fine at ease actually. I go out the next morning start it let it run get oil pressure below 60 then I take off and I was about 5 10 minutes into my trip and realized when I step on it at 0-50 it smokes black pretty good but anything after 50 it’s fine and straightens out. Air filter is black fuel leak from the rail on driver side and that I think boost problem I’m having. All that happened pretty much in that one night. But would like to figure this out with this being my first duramax and I absolutely love the truck
Yep you most likely blew a rubber boot that conects the turbo piping. They could be completely separated or it just could be a hole. If it's not one of them it could be a hole in one of the pipes or the Y bridge separated.