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      09-08-2019, 07:17 PM   #1
gmagnus7
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Drives: BMW 135i FBO N54 MT
Join Date: Mar 2018
Location: Ontario

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Stutter when cruising - Injectors failing or clutch slipping?

Hey guys,

I've started to notice a slight stutter or jerking on the highway in 6th gear. It occurs when i'm using cruise control, on flat areas with no change in throttle input. It feels like the throttle is getting cut for a millisecond, or the clutch is slipping but the rpms drop rather than increase. I've attached the logs, you can see the drop in rpm and sometimes ignition timing drops too.

Maybe its a bad injector but it why would that make the rpm drop? I can also hear a a slight clunking sound when it occurs sometimes, and I think it's from the DMFW (it's been slightly audible since switching to the UCC blacks). Maybe the clutch is slipping and/or the DMFW is shot and causing weird vibrations that the knock sensors are picking up?

Not sure what the cause is, lemme know what you guys think. WOT and part throttle are fine and those logs look okay. Whatever it is, it's not kicking it out of cruise when it occurs, and is giving no codes.

EDIT: uploaded zip with 2 logs of it
Attached Files
File Type: zip stutter logs.zip (13.6 KB, 2 views)

Last edited by gmagnus7; 09-08-2019 at 07:26 PM..
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135i, broken, clutch, dmfw, injector, n54, slip

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