Question: LB7 low power after recent injectors

dieseldave01

dieseldave01

supertrucker
Jun 3, 2008
323
0
16
Oxford OH
Last week i had all 8 injectors replaced with GM remans, in september 2011 the injection pump was replaced. When i got my truck back from getting injectors done last week it seems like i have a large loss of power at low gear/speeds. From a stop i can mash pedal to the floor and truck takes off like im taking it nice and easy, engine doesnt rev or anything, then when it shifts 2-3 range/higher RPMs it takes off like it is supposed to. Everything seems normal besides this low power issue, truck runs great, nice and smooth. fuel econ seems normal, like i said even when i mash it it is very smooth. It feels like massive turbo lag, Any Ideas?
 
chevyburnout1

chevyburnout1

Fixing it till it breaks
Aug 25, 2008
2,368
1
38
Berthoud, CO
Sounds like something fishy with the MAF sensor. Like the ECM is not seeing enough airflow to fuel it. My truck acted exactly like this when I put the 5" intake on without reprogramming the MAF flow rate to the larger size intake

And FYI, the Duramax doesn't have a throttle position sensor. Just has an APP (Acelerator Pedal Position sensor). And if those act up they almost always set a code.
 
dieseldave01

dieseldave01

supertrucker
Jun 3, 2008
323
0
16
Oxford OH
with the afe air intake the maf will only go in one way so it seems ok, but last night when i was looking around in there it looks like the intake had a bad connection and was not sealed so i tightened it all up and should be able to tell today when i drive it, thanks for all the help and suggestions
 
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