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So i just got a new engine built in my 09 wrx, mahle 4032 pistons, manley rods, acl bearings. sti crank, and all that good stuff. And i dont know if its random sensor noise or not. But sometimes knock sum on cyl 4 goes up maybe to like 15-20 ish in a 10-15 min drive and sometimes it will only see 1 after like 40 min of driving (running no boost for my break in). All others are at 0 and fine knock learn is at a constant 0 as well as feedback knock at 0. DAM also stays at 1 constant. What i noticed in my logs is once in a while Injector duty will go to 0% for a few lines and thats when the knock on 4 happens. Usually when i let off the throttle as well. But i mean this value will go up sometimes even if im sitting in one spot in neutral and i revv it a bit, ill see knock on 4.
Any ideas? Bad injector? Should i worry?
if needed i can upload a log.
Any ideas? Bad injector? Should i worry?
if needed i can upload a log.