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Re: Similar Problem! (archive)

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Posted by e.rogers on August 04, 2001 at 01:13:53:

In Reply to: Need some help with auto trans problems posted by R Kieffer on August 02, 2001 at 19:19:17:

I have a 1991 BMW 525i Automatic (M50 engin) with 154,000 miles.
I have somewhat the same issue except that the TRANS PROGRAM light comes on after transmission seems to slip when changing from 1st to 2nd gear. Then the tranny begins to shift oddly, slipping periodically as it shifts, hard transition between gears. 95% of the time it works perfectly. Only after driving for a while (out for an evening cruz for an hour or two). It has to be electrical. the hardwear seems to be fine.

Anyone have any thought or solutions.

Thanks.

1991 BMW 525i (M50 engine)
1987 BMW 325i convertable
******************************

For about the past year, I've received the "trans program" error every so often. When the message doesn't display, the transmission runs perfectly, which is about 95% of the time. In a few cases, I've either shut the car off, or disconnected the battery, and everything went back to normal. Here a few weeks ago, trying these things would not reset the error, so I removed the wood trim piece around the shifter, and cleaned the transmission lever position switch and the electronic/manual switch. I also got into the e-box (under the hood in front of the glovebox) and cleaned the contacts for the main power relay, the other relay (?), and two of the large connectors going into the computers. This worked for a while, but I got the error again last night when I got ready to drive the car. So I drove my other car, and when I got in my 535i this morning, everything was back to normal.

During all of this, the tranny shifts fine almost all of the time. The only clue that something seems to be wrong is when it "bangs" the downshifts sometimes when coming to a stop. I tried to pull the codes out this morning, but didn't get any. I've read lots of posts in the archives about this problem, and I think the only things left that've been suggested are to replace the two solenoids in the transmission valve body and maybe the speed sensor. I'm not afraid to do this myself, although the $114 cost for each solenoid isn't easy to take. I am convinced that this is an electical problem since the tranny operates fine 95% of the time. Before delving into higher dollar attempts to fix this problem, I wondered if anyone has had their tranny act similarly and has identified and fixed the problem. If you have, I'd greatly appreciate you taking a couple of minutes to point me in the right direction.

Regards,

Robert J. Kieffer
1991 535i





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