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BMW 3-Series (E90 E92) Forum
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N54 “Superknock”
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Yesterday, 07:24 PM | #1 |
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N54 “Superknock”
Hello! I want to start off prefacing, I am an N54 newbie. So I apologize for any stupid questions.
But I recently bought a 335i n54 and I did the classic intakes, CP, FMIC, stage 1+ MHD. 91 OCT I also installed new Endor coils and 1 step colder plugs. Today I installed catless Downpipes and flashed MHD 2+ 91 OCT Car sounds great and runs great. The issue i am having is, at WOT around 5-6k the revs stutter ever so slightly and MHD is showing a “super knock” shadow code. I cleared the code and tested multiple times. And the super knock code moves seemingly randomly between cylinders. First time it was cyl 5. Then cyl 6 and cyl 2. I flashed back to Stage 1+ it’s having the same issue. Superknock shadow code for cyl 1 this time. If I drive the car sporty, but dont go WOT to 6.5k, the car doesnt throw the Superknock code. Even when revving the car out to 6.5k at 70% throttle does not cause the code. It’s only happening WOT and high rpms. The car drives amazing, and I dont hear or feel any misfiring. Just the minor stutter in the revs and the codes so I just dont understand what’s going on |
Yesterday, 10:19 PM | #2 |
Robot
1897
Rep 2,331
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Flash "Stage 0" (no tune but MHD stays installed, easy and fast) then do a proper log and post the file here. We need to see your fuel pressure.
It could also be injectors, or maybe something simple as carbon build up. |
Appreciate
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