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View Full Version : Engine Stutters on start up. Why?


Georgere
05-29-2008, 12:29 AM
i didnt use the car (06 325i 6-sp w/31Kmi) for 24 hrs...

i pushed the start button tonight and engine starts but in a mil of a sec it starts to stutter (idle rmps jumping from .3 to >1K)... it continued for a half minute maybe.... after that i gave it some gas and idling went to normal... :eek:


what was it? is there a problem with my engine/idle/fuel sys/what else?

thnx in advance
galahad05
05-29-2008, 03:23 AM
Do you have access to a code reader?
Georgere
05-29-2008, 09:46 AM
i tried the bc (on-board computer) to run a check and it showed nothing wrong ...... this am car started ok....
TeaRoy
05-29-2008, 04:28 PM
I've got an '08 335 and have had the same issue - actually dropped it off again this afternoon for the second time for this.

The first time mine did exactly like you said - turned over a bunch of times, then fired up with the RPM's all over. Shut're down, re-start and it ran fine. Then a few days later, it happened again, and again, then tripped a check engine light. They said it was getting a lean fuel mixture (not enough oxygen) and they reset a computer and I was good to go....for a month or so. Last couple days, same thing - only this time it stalled on me a couple times this morning and when driving it into work it would 'lurch' a bit on acceleration, almost like it was misfiring...dropped it off a few hours ago...we'll see. :(
TeaRoy
05-29-2008, 06:42 PM
Mine was a bad HPFP (fuel pump) - known problem with the 335 - but my build date was 10/2007 - I thought they had made changes to the pump by then...oh well.
mryakan
05-29-2008, 10:45 PM
Ugh sucks, but soon you will have a new pump. You might want to update the sticky thread so there is an easy to find record of a late 07MY HPFP failure.
Georgere
05-30-2008, 12:26 AM
06 325 have had this (i.e. fuel pump) problem too?
mryakan
05-30-2008, 12:40 PM
06 325 have had this (i.e. fuel pump) problem too?
I don't think so since the HFPF is specific to the N54 engine.
TeaRoy
05-30-2008, 01:04 PM
... You might want to update the sticky thread so there is an easy to find record of a late 07MY HPFP failure.

Done...thanks. Good sticky thread by-the-way.