Power/performance/stalling

Tiny
PARISH77
  • MEMBER
  • 2001 BMW 320I
  • 2WD
  • MANUAL
Hi,

What occurs is that starting from warm the performance ie, acceleration is sluggish.
If the revs are not high enough it will cut out from a standing start or stall when coming to a stop or braking suddenly.

Under idle the revs will fluctuate too. I've noticed that from cold it idles uniformly at just under a 1000 rpm but as the engine warms up or from restart of a warm engine it fluxes between 500 and 750 rpm.

The problem may have manifested itself after a routine oil inspection. I cannot remember for sure.

The oil light does come on randomly for a few seconds but disappears almost immediately and after stalling the engine does restart ok although it takes a few seconds longer than normal.

All of this points to an airflow/pressure problem but could just as easily be electrical. I've seen solutions ranging from software updates of the computer, to replacing fuses, searching for ash deposits, changing coils, oil pressure, fuel pressure etc etc. The list is endless and can only really be solved with putting the car on to a scan tool and seeing what it comes up with.

The problem I have is that I don't trust garages.
Many will just turn around and say "you need a new computer and that'll £££££££ thousand please"

Is there anything that I can do to perhaps solve the problem before resorting to more expensive solutions?

My car is a 2001 BMW 320i and the miles on the clock are just coming up to 90k

Thanks
Mark
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Wednesday, June 29th, 2011 AT 1:54 PM

8 Replies

Tiny
MERLIN2021
  • EXPERT
If the. Check engine light is on, Autozone will svan the codes free. Scanning ia ALWAYS the first step.
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Wednesday, June 29th, 2011 AT 3:33 PM
Tiny
PARISH77
  • MEMBER
The check engine light doesn't come on.
A BMW technician has since suggested to me that it could be a camshaft sensor fault, but there are two sensors and it could be either or both.
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Thursday, June 30th, 2011 AT 8:14 AM
Tiny
MERLIN2021
  • EXPERT
Can sensors are a common problem and in more makes than bmw. Most times a 341 code sets. It is posible that its out just a bit and not set a code.
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Thursday, June 30th, 2011 AT 10:32 AM
Tiny
PARISH77
  • MEMBER
What do you mean by "it's out just a bit"? Do you mean the connection could be loose or something like that?
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Thursday, June 30th, 2011 AT 10:55 AM
Tiny
MERLIN2021
  • EXPERT
That's possible too but I mean out of range resistance or voltage wise.
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Friday, July 1st, 2011 AT 8:37 AM
Tiny
DR. HAGERTY
  • MEMBER
BMW calls it a plausibility fault and if it is a cam sensor, it will set a fault. The issue will require scanning with the proprietary BMW scan tool and a knowledgeable technician to analyze the live data to find the problem.
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Friday, July 1st, 2011 AT 12:10 PM
Tiny
PARISH77
  • MEMBER
"a plausibility fault"

I'm curious as to why they call it that? Are they suggesting that it will probably be a sensor but could just as easily be something else entirely?

That sort of explains the numerous possible answers to the problem that I've found online.
I'm hopefully having it scanned this evening. Will update this thread with fault code etc
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Friday, July 1st, 2011 AT 1:12 PM
Tiny
DR. HAGERTY
  • MEMBER
Standing by
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Tuesday, July 5th, 2011 AT 5:50 PM

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