Posted 2012-02-08 8:25 AM (#5326) Subject: 02 2500HD 8.1 surges while pulling
Alright guys I am new here but I need some help. I have an 02 chevy 2500HD with the 8.1 and the Allison trans. For a while now the truck surges pretty bad at around 3000 rpms, more like bucks really. I only notice it with a load on but that might jsut be because if I am empty at 3000 rpms I am goin 90. anyway I am not sure where to look, it never throws a code while its doing this. I have replaced all plugs and wires twice in the last 50k miles and it hasnt helped, the only reason I did it twice is because of another issue about a recall on plugs.
Another thing this truck seems to do is, I pull somewhere in tow haul mode, get to my destination and all is well, turn the truck off and I can be there for ten minutes or 5 hours, load up to go home and I make it about 500 ft and the check engine light comes on and it is always a MAF sensor code. I have tried a new sensor twice and clean the sensor about a dozen times and nothing seems to cure this problem. I have tried to research it online to no avail.
Please help as these two issues are about to drive me batty.
Thanks for any ideas and help you can throw my way.