Start with what you notice
What is the car doing?
Pick the closest symptom to read what owners reported in public forum threads, with a link to each source post. Reports are not independently verified and are not a diagnosis for your car.
- Platform
- E9x 335i
- Engine
- N54 twin-turbo
- Coverage
- 3 topics
_coupe_(2011-07-17)_01.jpg){kind=link}
Feels slow
30FF / UnderboostPosts4
Items18
Threads1
30FF / UnderboostAn owner's low-boost symptoms, unsuccessful attempts, and reported vacuum-accumulator diagnosis.
Open →
Runs rough
Misfire / Rough IdlePosts5
Items17
Threads1
Misfire / Rough IdleOwner reports of misfires, the work they tried, and what they said happened next.
Open →
Oil up front
OFHG / front oil leaksPosts5
Items9
Threads1
OFHG / Front Oil LeaksOwner reports of gasket work, oil leaks, and limited follow-up observations.
Open →
Jump to a topic
30FFOne owner's reports of low boost after an intercooler installMisfireOwner reports of misfires and rough running from one forum threadOFHGWhat forum owners reported about OFHG and front oil leaks
Topics
Sources
Linked from each topic
Photo
2011 photo by OSX, public domain; image cropped to fit
Status
Owner reports, not a shop diagnosis