Re: bmw-digest V9 #1058

["John Ward" <jtward@xxxxxxxxxxx>]

>Date: Sun, 11 Apr 1999 23:31:19 -0500
>From: "Aggieboy and Therapygirl" <pohl@domain.elided>
>Subject: Question for all M50 owners
>
>Hey 325 and 525 drivers!
>
>I've got a peculiar problem with my car (non-vanos M50 mated to a 4-speed
>automatic).  The dealer (a very good one) was baffeled for a while and
>finally tried out three other M50 engined cars, and concluded: 'All M50's
do
>that'!  I find it hard to believe but trust him as he's been rather helpful
>in the past, so please try this out and see if you can or cannot duplicate
>the problem.
>
>Here it is:
>
>Drive about 65-70 and kick down into 3rd gear for hard acceleration.  Watch
>the tach pass 4000 and klimb towards 5000 (should be up to about 80-85
now).
>Somewhere between 4 and 5k you should see (and feel) a 200 RPM
>correction/dropout.  You will actually see the needle go backwards.  I can
>make thi shappen every time in 'E' mode and I think most of the time in 'S'
>(maybe every time, I don't use 'S' that often).
>
>My dealer said he couldn't find anything from the BMW tech database either.
>I it hard to belive that these three things could happen at the same time:
>
>- - All M50s do that
>- - BMW has no tech info on this
>- - Nobody on this list has ever complained about it before
>
>I hope you guys can assist me here, I still have warrenty coverage for 1000
>miles!  I would guess if this is a transmission or engine problem that that
>is a rather expensive repair.
>
>So hopefully somebody with a stick can try this to see if maybe it's a
>transmission problem, and maybe we've got some 325 owners too for variety.
>
>Thanks a bunch ...
>                                     ______
>Antony Pohl                        o/______\o
>92 525iTA "Sharked"                (Oo=00=oO)
>BMW CCA, Houston Chapter           []=****=[]
>


Antony, I've never had this problem on my car that I've noticed. I have a
Jim C chip, K&N air filter, and as of this Thursday a new M3 exhaust will be
installed. My car is a 1992 non-vanos 325i, automatic transmission and now
has 126,000 miles on it. Make sure all your routine service is done, fluids,
spark plugs,
 filters, etc. Perhaps your 02 sensor is getting ready to go? I had some
rough running when
 mine started to go...  although I can't imagine it wouldn't occur more
sporadically than just
 at higher rpms on the interstate. The M50 doesn't need any tune-ups because
it has
self-adjusting valves.

Regards,

John

1990 750iL
1992 325iA
BMW CCA 150800, Buckeye Chapter

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