I will start by saying I have only had HPT for a couple weeks now, so I apologize for my ignorance and will try to keep this brief.
I have a 5.3l/4l80e swapped GM squarebody I finished up a few months ago. I sent off the PCM to be tuned for the engine mods listed below.
From First start til now, I have been battling nasty random misfires (P0300), fouled spark plugs, and the exhaust reeks of fuel.
I replaced the plugs, plug wires, MAF, and O2 sensors with no change. I have also swapped injectors, and moved coil packs around with no change (Cylinders 2,3, and 6 are the main culprits).
If I hold RPM's to say 1400, it smooths out and my misfires disappear.
So in my wanting to get HPT for a while anyways, I decided to pull the trigger thinking this would be a great opportunity to get use to the scanner and help troubleshoot this truck.
I found the RussK Idle-airflow config and used this to log the truck at idle. Problem is, I don't quite understand what I am looking at or how the PCM is using this data to make other changes. It is very frustrating to look at the log knowing something isnt right, but not knowing what to do or how to proceed.
So, can someone take a quick look at this log and let me know what you, from a tuners perspective, see here? I feel like if I keep running the truck, something will break soon
Engine is a Gen III DBW LM7 with the following:
Isky cam 206/212 dur. @.050, 25X/26X lift, 112+4 LSA (-15° overlap)
799 heads stock with appropriate valvetrain for above cam
Longtube headers and 2.5" exhaust
CAI
Mail order tune
Thanks in advance for any help!
K10 BASE + DTC DELETE.hpt Idle-Airflow.cfg Idle-Air scan (high IAC).hpl