Hello, i am new to the tuning community and I am tuning a 2007 Suburban LTZ with a 6.0L LQ4 "cast iron block and heads 5,967 cc (6.0 L; 364.1 cu in)" bored over to 6.2L "6,162 cc (6.2 L; 376.0 cu in)" Stock L9H Cam, crank, pistons, internally balanced, shorty headers, holley valve covers, 2400 stall FTI torque converter, drilled/tapped to install knock sensors "utilized side casting mounts, did not penetrate engine block". The transmission is a built 4L60E. I'm having a few issues getting the tuning just right for this build, are there any recommendations out there on getting everything to work properly and possibly some good performance out of this build? The original engine was a 5.3L so to get it to start and run was a challenge in itself. but, it runs and drives with no codes and is peppy but seems to lose power "like hitting a wall" at full throttle. also i think i messed up the tuning for the electric fans and a/c, the fans turn on after 15 seconds on low and then on high 2 seconds after that. The a/c will not turn on at all, it's fully charged and i have replaced every single sensor if i jump the relay the compressor and it blows cold turns on I'm looking at using my tech2 to reprogram the head unit to see if that fixes it. My 4WD also does not engage anymore could i have tuned that out on accident as well? I have hit a wall in my limited tuning capabilities and need someones help. if you can help i would greatly appreciate it. if not, can you could point me in the right direction i would appreciate that as well. Thank you in advance for any help you may be able to provide. Eventually i will be doing a duramax build for this suburban this was a budget build for now.
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Originally Posted by MakesBadDecisions
