alright so im new here trying to learn. i have a 2008 suburban 2500 with the 6.0l and 6 speed trans. i have NOT done any tune modifications yet. trying to get it running right, (thats why i bought HP tuners). the truck isnt trowing any codes but its running like ass. attached is the latest log i did. i see it has a bunch of Knock Retard and pulling tons of timing. if someone could point me in a direction of what to look at, please do!!
things if done.
put Premium fuel in
replaced TPS and MAF
new spark plugs
new spark plug wires
checked for vacuum leaks at the intake manifold-holds 20 in lbs of vacuum at idle
checked intake for leaks at all connections.
replaced cats due to them glowing after driving home at night. thought they were plugged. new cats made zero change.
had truck scanned with multi thousand dollar Mac Tools scanner. that showed no codes related to the issue.
i am at a loss as to why it is showing so much KR and pulling so much timing. could it just be that the knock sensors are bad and giving bad information??
thanks Matt