ot: 99 BMW 7 series v12 transmission issues |
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ot: 99 BMW 7 series v12 transmission issues |
RJMII |
Jan 11 2015, 12:37 PM
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#1
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Jim McIntosh Group: Members Posts: 3,125 Joined: 11-September 07 From: Sandy, Utah Member No.: 8,112 Region Association: None |
A friend of mine picked up a new for cheap and the transmission goes into fail safe mode.
Previous owner had been in the transmission and said clutch packs are good. Recommendations for diagnosing? Availability of rebuild kits? Torque specs and tolerances for while I have it open? (New to BMW transmission, but familiar with a lot of us brand automatic transmission) Posting from a tablet... pardon the grammar. :-) |
Mike Bellis |
Jan 11 2015, 12:51 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
The BMW limp mod places the tranny in 3rd gear. Limp mode may be caused by any number of engine codes. You will need a good scan to determine what the problem is. My 535 did this after throwing an O2 sensor code. I replaced the O2 and the limp mode continued. I sold the car as scrap after a failed smog check and gross polluter result.
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injunmort |
Jan 11 2015, 04:09 PM
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#3
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Senior Member Group: Members Posts: 1,024 Joined: 12-April 10 From: sugarloaf ny Member No.: 11,604 Region Association: North East States |
my 1990 750 had a gm transmission in it. they fail around 160miles but are easily rebuilt by someone with gm history
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rick 918-S |
Jan 11 2015, 07:55 PM
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#4
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Hey nice rack! -Celette Group: Members Posts: 20,462 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region |
My by TH 400 internals. Check to see if it has a vacuum kick down or cable.
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Cap'n Krusty |
Jan 12 2015, 04:25 PM
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#5
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Somebody actually BOUGHT a 750?
ZF is REALLY proud of their parts, which are also fairly difficult to source unless you're an authorized ZF rebuilder. The Cap'n |
RJMII |
Jan 12 2015, 08:44 PM
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#6
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Jim McIntosh Group: Members Posts: 3,125 Joined: 11-September 07 From: Sandy, Utah Member No.: 8,112 Region Association: None |
Somebody actually BOUGHT a 750? ZF is REALLY proud of their parts, which are also fairly difficult to source unless you're an authorized ZF rebuilder. The Cap'n Yeah... he did. He's all proud that original msrp is so high. I've been thinking about helping him fix it and sell it so he can pay off other project cars. |
RJMII |
Jan 12 2015, 08:46 PM
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#7
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Jim McIntosh Group: Members Posts: 3,125 Joined: 11-September 07 From: Sandy, Utah Member No.: 8,112 Region Association: None |
My by TH 400 internals. Check to see if it has a vacuum kick down or cable. He just sent the info to me... i wonder if the 90 has same transmission as 99. .. 1999 BMW 750IL has 5.4L V12 5 speed automatic tranny rear wheel drive leather interior heated seats and steering wheel 5 disk cd changer tons of space |
r_towle |
Jan 12 2015, 08:50 PM
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#8
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Custom Member Group: Members Posts: 24,576 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
Might be simpler to source a used tranny and swap it.
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Dr Evil |
Jan 17 2015, 01:28 PM
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#9
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Send me your transmission! Group: Members Posts: 23,000 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
So that the swapped in tranny can act the same due to the issue that is throwing the code that is causing the tranny to go into safe mode like Mike said. Make sure it is the trans and not just the computer being a dick.
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