Tuning a Grand Cherokee SRT with a cam motion custom 218/224 cam
I'm getting some crazy knock at very light throttle (audible knock) but if you give it a little throttle it goes away. I've never run into this issue before and I'm lost as to what could cause light throttle knock.
The Jeep originally came to my shop with a Comp HRT stg 2 cam. We scheduled a tune appointment and before he come for tuning, it sheared the dowel pin. Took out all the exhaust valves and broke a couple of pistons. Installed 4032 forged drop in pistons and put a new cam. Engine was pulled, torn down, hot tanked, new cam bearings, crank was turned, new main and rod bearings, and all exhaust valves replaced.
Cranks, idles, runs, and drives fine (as long as you DRIVE it) but at very low throttle input the knock sensors go crazy, the audible knock is obvious, but with enough throttle to make it down shift, it clears up. WOT pulls are pretty clean (it's been parked a while, I question the quality of gas, but I'll get to that when I get this figured out) Poor gas quality might be my issue, but it seems I'd see knock in higher load areas if that were the case vs just very light throttle.
jeep log.hpl
Jeep Grand cherkee SRT CM 218_224.hpt