1986 735i autotransmission not shifting into low gears - BMW Forum - BimmerWerkz.com
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1,6,7,8 - Series and Mini Cooper General Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.

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Old 04-26-2010, 04:26 PM   #1 (permalink)
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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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Old 05-17-2010, 10:29 PM   #2 (permalink)
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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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Old 05-18-2010, 02:38 PM   #3 (permalink)
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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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Old 05-19-2010, 11:43 PM   #4 (permalink)
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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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Old 05-20-2010, 12:15 AM   #5 (permalink)
OMFG another one!?
 
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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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Old 05-21-2010, 04:47 AM   #6 (permalink)
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is there a vacum modulator on these
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Old 11-05-2011, 01:12 PM   #7 (permalink)
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Meticulous Guy - I have the same problem. What did you have to do to fix this?
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Old 11-05-2011, 11:13 PM   #8 (permalink)
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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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