I've just bought a 97 BMW 323i. (150ks / 65000 miles) Test drive etc
was fine, driving it home, I noticed it was VERY rough at about 100kmh
(60mph), I rang the previous owner who said it sometime happens in
economy mode (auto) and change to sport mode, this should fix it...
and it did. Puzzled! Any ideas? I was going to do a transmition
fluid change this week not sure this will help....
Any ideas my dear BMW afficondos?
On Wed, 10 Oct 2007 04:03:14 -0700, firstname.lastname@example.org waffled on
Did the roughness come or go when the torque converter by-pass
engages? You can usually see/hear when this happens, get yourself to a
nice cruising speed, say 60mph, and then feather the throttle a
little, when the bypass engages the revs will drop about 500rpm, but
with no loss of speed.
Does this have any effect on the noise?
No cruising at 65 mph it should be in top gear regardless of sport or
I dont believe it's a wheel balance or suspension issue, I'd
experience it regardless of the mode the auto is in.. Perhaps a fault
in the ECU mappings for economy mode where it doesnt provide enough
fuel or similar mioght make the car shudder?
On Oct 12, 5:29 am, email@example.com wrote:
Ok, you guys are right... 5th? must be disabked in sport mode and is
responsible for the rough running. Thats bad news, must mean my
gearbox is due for a major looking into!
5th kis a funny gear to go... I know of them going on high torque
vehicles, ie Toyota Landcruiser diesels, but 5th in an auto wouldnt
get much of a flogging I'd think. Now to find a local auto
transmition specialist that doesnt charge me my firstborn to have a
I don't know the country where your car was originally sold, but US spec
cars may have a totally different make auto from Euro ones. Including
being a 4 rather than 5 speed.
Again depending on country etc the torque convertor lock up clutch may
only work in the highest gear - so it might be that giving the problems.
If it were oscillating. So it *might* be a rare fault which can be cured
without gearbox removal and a subsequent full overhaul. You'll need to
find a good honest specialist. Good luck in that.
*Microsoft broke Volkswagen's record: They only made 21.4 million bugs.
Dave Plowman firstname.lastname@example.org London SW
You don't say what you mean by "rough".
If you run the car in the region of 90 - 100kmph you are near the point at
which the box changes from 4th to 5th. The gearbox may hunt (change up and
down a lot) in this case, especially on cruise.
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