M50, '92 525I Rough idle

["RONALD A. GAUDET" <RGAUDET@xxxxxxxxxxxxxx>]

To add to David's comments----

I to have a rough Idleing 1992 525I.  Its got 84,000 miles and I've owned=

it for about a month now.  The car runs great at any RPM but idle.   Sinc=
e
this is my first BMW (always had an American car in the past, large engin=
e
low RPM) I wasn't sure that it just idled rough due to the valve timeing
differences that would allow the car to achive 6500 RPM.   Any comments??=
?

 I'm a new comer to this list but have been reading it for the last 2-3
months.  Learned a lot.
Thanks, =

Ron Gaudet      1992 525i (It drives so smooth)
CCA#158247          1992 Suburban for Wife-Kids-Dog-pulling boat and Stuf=
f
- -------------------------------------------------------------------------=
- --
- ---------------------------
Date: Mon, 24 Aug 1998 14:16:05 +0800
From: David Walker <advantag@domain.elided>
Subject: Sender: owner-bmw@domain.elided

Dear BMW-digest

Re; 1991 525i sedan

I have an English (privately imported to Australia) 1991 525i automatic
sedan.
When moving the car is great - but it really doesn't like idling. It idle=
s
at about 660-700 revs and tends to shudder/splutter but never actually
stalls. If it was a person you'd say it had a bit of a persistent
cough/stutter. The local BMW dealer and my  mechanic have said that the
current performance is quite acceptable. However my 1984 525 idles
perfectly
compared to the 91, and I don't want to accept that nothing can be done.

Initially the local dealer (when fixing a few other problems when I first=

got the car) said they may be able to 'fool' the car into thinking the
air-con was on so it would idle at a higher rate of revs, but they were
unable to fit a new e-prom chip anyway (something about not being able to=

get the code they needed) so that got put in the too-hard basket.

Interestingly last week the problem got much worse and on taking it to my=

mechanic he found a hose loose which had resulted in an air leak. Of cour=
se
repairing this problem made it much better, but didn't totally eliminate
the
symptoms and we're back to where we were. Of course to my layman's way of=

thinking this implies there could be a much smaller air leak somewhere el=
se
that has escaped identification. =


Any ideas please.

Many thanks

David Walker

------------------------------