2013 GMC Texas Speed 212 218 cam and LT headers issue
#21
#22
Last night I tried running with traction control and stabilitrak turned off. It didn't make a difference. I think my next step is to try a different tune all together using HPtuners. I will post back with the results.
#25
Well I found the issue, It was the drivers side header hitting the floor of the cab. No less than 6 other people had ridden in the truck and all said that they thought it was a misfire also. I feel dumb, but I am glad that it was something this minor.
#26
So how was that causing the mixture to fire in the header? You think the ecm took that to be knock and was retarding timing?
#27
When we looked at logs we could never find it doing anything with timing. So we were troubleshooting the noise as a misfire that wasn't actually occurring. It was not firing in the header after all, just sounded like it.
#28