1986 735i autotransmission not shifting into low gears - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-26-2010, 05:26 PM
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1986 735i autotransmission not shifting into low gears

Hey,

I'm new to the forum. I just signed up in hopes to get my 86 735i running for the summer again.

I took the 735i off the road before winter and it has been sitting under a tarp through-out the winter.

The problem I am having is that the transmission will only shift into 3rd when I have the auto shifter in D.

When I selece 1st, 2nd, it does not down shift. But the gears are displaying on the dash as 1, 2, 3, D, N, R when I select them with the auto shifter.

I have checked the wiring, it is ok.

I have manually hooked up the VIO (Violet) wire to + and tested the sylenoids, they all click. Seems like they're working.

I have changed out the T.C.U. (Transmission Control Unit) and it has not changed anything.

I have also changed the shifter switch and shift mode switch.

I am strugging with this and hoping it is nothing severe such as the Transmission needing a rebuild. But if it comes down to it, I may replace it if the Transmission is the problem.

If anyone has any info about this problem, I would greatly appreciate it very much as I have worked for several days scratching my head and have not found the problem.

PM, or E Mail please!

Thank you!
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#2 (permalink) Old 05-17-2010, 11:29 PM
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i would check fluid and filter if not already done i have an 87 735i that did the same thing when i first started it up and drove off in the morning and the tranny would very roughly shift the first couple of times until it got semi warmed up might be a stopped up filter
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#3 (permalink) Old 05-18-2010, 03:38 PM
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Hey. Thanks for the reply but I think your problem was hard shifting.

My problem is no shifting from high gear. It does not down shift when first driving. The car stays in 3rd.
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#4 (permalink) Old 05-20-2010, 12:43 AM
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smashed trans cooler broken pickup tube

After about 30 mi. small drip of oil and park slow to engage then it got noisy, did I burn it up?
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#5 (permalink) Old 05-20-2010, 01:15 AM
OMFG another one!?
 
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Originally Posted by trblcumn View Post
After about 30 mi. small drip of oil and park slow to engage then it got noisy, did I burn it up?
It clearly will need service

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#6 (permalink) Old 05-21-2010, 05:47 AM
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is there a vacum modulator on these
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#7 (permalink) Old 11-05-2011, 02:12 PM
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Meticulous Guy - I have the same problem. What did you have to do to fix this?
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#8 (permalink) Old 11-06-2011, 12:13 AM
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I rebuilt the valve body flushed the trans twice,for the engine i used soapy still no improvement talked to some trans. rebuilders and said all seals are gooey so i found a `95 tranny on ebay put it in and it shows trans fault I missed matching my model by 4 months so do your research fist! some of this german engineering is clearly thought up in the bathroom, I wanted a stick shift anyway
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