DarrenW
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| posted on 18/4/06 at 01:17 PM |
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BMW 320D power problem
Any BMW experts out there?
Ive got a 320d, 2002 tourer. 150bhp model.
Over the last few days ive noticed an intermittent problem. Start out on a run and all is well. After a while it sometimes looses power. It feels like
its lost its boost pressure and wont accelerate. It doesnt always do it.
A few things to note;
1. it was serviced recently at dealer (52K milkes).
2. i put some Diesel in at a garage i dont frequent often on Friday. Was OK for a while before fault occured - i dont think it is related. I did put
some fuel in yesterday at different garage and it has been OK last night and this morning but dont know if it will happen again (too early to
tell).
3. We have noticed the yellow traction control light flicker once occasionally but cant pin the fault down to the light flickering.
Has anyone come across this before. The car still drives when the power is lost but obviously not as well.
If it is fuel related why would this be?
Im more thinking that the traction control (ASC) is telling the ECU that traction has been lost. in winter the traction control worked well - over
weekend there has been no reason for traction to be lost though. (i hope i havent thrown a red herring in here).
Any advice welcome.
(PS i have full warranty so will take to dealer if it happens again - i know they hate intermittent faults though. I also have emergency assist if it
fails away from home).
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Peter Cowley
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| posted on 18/4/06 at 01:21 PM |
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Could be the air mass meter, my old bora did a similar thing.
Easier to take it to a dealer plug it into the diag machine, and if theres a fault an error code will be logged.
Peter.
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DarrenW
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| posted on 18/4/06 at 01:26 PM |
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Cheers Peter. Do the ECU's log the fault has happened (ie keep the history) or only when it is happening?
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Darth Blader
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| posted on 18/4/06 at 01:33 PM |
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Does sound like the mass air-flow sensor, it's a very common fault on this engine and will need replacing. From what I know (a friend had the
same problem) it doesn't log as a fault and diagnosis tends to be a trial and error affair. But at around £160 for the part, you'd want to
be sure.
Cheers
Rick
Right to Tighten....Left to Loosen
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Agriv8
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| posted on 18/4/06 at 01:36 PM |
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Air mass Meter.
my VW passat TDI had a similar problem I belive the BMW uses the same Bosch hotwire mass meter.
Mine would be fine but felt when accelerating hard just did not feel to have the full BHP available.
I belive that German swedish and french GSFCARPARTS do a rebuild kit and if not likley to be cheaper than the dealer. they have a online website
Regards
Agriv8
[Edited on 18/4/06 by Agriv8]
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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DarrenW
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| posted on 18/4/06 at 01:41 PM |
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thanks guys. Im not an expert on mass air meters so didnt think about that. When it happens it just feels very sluggish and doesnt want to rev.
Normally the car accelerates strongly and you can feel the rurbo kick in. There are no noises, squeaks or rattles etc.
If it is the MAF will it eventually pack in completely or continue as an intermittent fault? Would you expect turning the engine off for a while and
restarting to 'clear' the fault - this seems to be what has happened over the weekend but as i say it is too new a fault for me to be able
to predict when it will happen.
The dealer has told me that the car has had 2 injectors replaced and a new pump fitted a while back. I only bought it in November (from main dealer
hence warranty). It has been faultless since November.
Thanks again,
darren.
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John.Taylor
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| posted on 18/4/06 at 02:14 PM |
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Two collegue's have had similar faults, one on a vectra CDTI was a loose hose depressurising the turbo, one on an Avensis D4D was a faulty
sensor on the tractor control system cutting the power.
Sorry to add confusion to the matter. Must say that most faults are logged these days, trouble comes if the ecu doesn't think that it is a
fault.
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froggy
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| posted on 18/4/06 at 04:20 PM |
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whip the back seat up and check to make sure the lift pump in the tank is working, could well be afm but very common for the lift pump to pack up
giving similar symptoms on the non turbo bm motors
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stevec
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| posted on 18/4/06 at 04:57 PM |
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You said the traction control light flickers.
Some of the modern high output diesels use the wheel speed sensors to limit torque untill the vehicle speed is seen to be above a certain speed.Saving
strain on the transmission.
Could the two things be linked?
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britishtrident
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| posted on 19/4/06 at 07:33 AM |
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Test for the MAF on the BMW engine is simply to disconnect it -- if the car runs better it is the MAF
see http://45zs.info/75Zt/R75maf.htm
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