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Re: Transmission Shifting Problem (archive)

[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]

Posted by Alex Lynch on December 27, 2000 at 09:22:57:

In Reply to: Hey Alex....didn't you have this problem. posted by George Mann on December 26, 2000 at 18:04:17:

George is right. If the problem only occurs when the transmission is hot it is unlikely that the transmission computer is the culprit.

The first thing I would check is the transmission fluid level as low fluid would cause the unit to overheat. From cold, run the car for about five miles until the temperature needle reaches the normal twelve o'clock position. Park the car on level ground with the engine still running then check the fluid level. It should be between the two bubbles on the dipstick.

As George said, plugged cooling lines to the radiator (the short wheelbase 735i doesn't have a separate transmission cooler) could also be a problem. The only way to service these is to remove the lines at the radiator and at the transmission then blow air through the lines.

You said that you recently had the transmission replaced. Was it replaced to solve the same problem? Is there not a warranty on the new transmission? Also, when you say that the transmission overheats, does the engine temperature also rise or does it stay in the usual position?


Alex Lynch
1992 735i 194,000 miles
1972 2002 187,000 miles

Seems to me Alex had a trans/heat related issue.
As I recall, it was related to his trans cooler.
He thought it may have been the dreaded A-pack
failure, but shifting was restored after restoring
adequate cooling. Wonder if your cooling lines
through the rad are plugged.
Seems to me, if its temperature related its probably not the trans computer unless you are
getting a read out on the display. Incidently
its never a bad idea to pull off your consile
wood facia and spray a little tuner spray into
the trans select switch which interfaces with the
Alex....can you shed some light?
Best Regards,
90 735il/144K

735i Automatic HP22,
After sitting in traffic seems like my tranny acts up
and starts up in 3rd gear. it only happens when car is idling for a very long time and tranny gets very hot.
I usally have to let it cool down and then all the gears work fine. I've already replaced tranny and just recently it started doing it again. could this be a computer prob.??

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