Recently had a P-1SC procharger and a TR224 cam package installed in my 5.3 tahoe. I haven't been driving it because it has been running very rough and it throws P0171 and P0300 codes. I recorded a short log with my autocal which I sent to Justin at Black Bear and this was the response:



"Hi David,

I still see a misfire in this log on bank one. P0171 could be from the injector calibration."





I have attached the log to this post as well if anyone can assist me in fixing this. Not too great with engines so not really sure where to start.

Currently I have NGK TR6 plugs gapped at .035 and new 52lb bosch injectors that were pulled from a crate ls9. Fuel pressure reads about 45 psi.

 

i had this same problem and i changed all kinds of crap.. ended up being my cat.. i took it to 2 different shops to the dealership no one could tell me what it was.. some girl ended up tell me in a waiting room at the dealership said her boyfriends truck had the same problem. pulled my cats off and truck was fixed.

 

Haven't had cats for a little over a year :/

 

what else was done to the truck at the same time? PO300 can be from the cam.......

 

Well most recent has been TR224 cam w/ hardened pushrods and new springs, p1sc Procharger, 52 lb injectors, and after receiving the codes I put in TR6 plugs gapped at .035 along with a wideband AFR, Boost, and fuel pressure gauges.

Couple weeks beforehand I had the 3400 stall and the new 4l60 put in, but had no problems with just them.

I gave all the info including the cam specs to Justin and he sent me a base tune based on it so idk if that may rule out it being the cam..

There's no smoke, but it smells extremely rich while idling if it helps

 

A misfire can be attribited to an error in the injector set up especially if they have just been changed. Who exactly is doing your tune?

 

Justin from black bear is doing the tune. I didn't install this myself..had a local speed shop do everything. Suppose I may have to talk to them tomorrow..

 

Found the cylinder 5 plug wire was melted. Some MSD wires should be here thursday and hopefully that should solve my problem.


Edit: Couldn't wait, so I ran to autozone and picked up a cheap set of wires from there. Replaced the melted one, problem solved. Literally shaking after the maiden voyage..she runs like a raped date now.