Quote:
Originally Posted by mihneagtt
Hi guys!
I recently bought an 07 335i and I have a problem with it. The idle is kinda rough sometimes and by rough I mean it has some moments when it "shakes" as if the cylinders were out of sync or something. The duration of this "shake" is very short but it repeats over and over randomly. I feel like it's worse at cold starts, but i can feel it even after it has been warmed up, just not as violent. Also, under light throttle between 1.5-2.3k rpm it doesn't feel smooth at all, it's like i'm constantly varying the throttle input even though my foot is steady.
Mods:
JB4 pump bef on 95RON (91 octane)
downpipes
dci's
I recorded some logs:
Cold start
https://datazap.me/u/mihneagtt/cold-...0&data=1-4
Light throttle
https://datazap.me/u/mihneagtt/light...le-cold-engine...
WOT on map1
https://datazap.me/u/mihneagtt/wot-map1-jb4-bef?log=0...
The car doesn't have any codes ATM, did have some regarding the vanos solenoids which would also throw the car in limp, i cleaned them and no more codes. Also had a 29E0, but i deleted it and it didn't come back yet. The car also smokes randomly, i have no idea why.
Sorry for the long post, but i've tried to supply as much information as i could. Thank you very much ! |
What maintenance has been done?
I had similar issue with rough idle / start but problem was fixed by replacing injectors (had mix of index 5 and 7s - changed to all index 12), plugs and coils, and walnut blasted the intake.
Random smoke could be anything but usually related to VCG or turbo seals. Upgrading the stock PCV to the RB one could help also.