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E34 (1989 - 1995)

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Old 11-03-2015, 08:15 PM
WGX_E34 WGX_E34 is offline
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Location: Malaysia
Join Date: Nov 2015
Posts: 4
Mein Auto: E34 525
Gearbox question

Hello all,

would like to enquire about my GB. Forward seems OK. Engaging reverse from P or N, takes about 2 seconds, then only the gears engage. Is that normal?

Do I need to repair or check anything on the GB?

I thought I read somewhere about valve or something.

Any help is appreciated.

Thank you
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Old 11-04-2015, 05:28 AM
capricornbmw capricornbmw is offline
Location: Many places
Join Date: Feb 2014
Posts: 1,791
Mein Auto: E36
No that's not normal. It could be many problems. It sounds potentially like a clogged valve body. The valve body controls oil pressure which is used to switch gears and if it gets clogged you can have shifting problems.

If it is clogged, you need to take it out and pressure wash it out, and may have to switch some seals and plastic check balls. It is a complicated issue and we don't have the right competence for it here. It would be better to get a good used vb and sub it in and see.

First, check if all your solenoids are within correct resistances. Use the TCM's harness and check resistances through that. Download the ETM for your transmission (should be 5hp18) and check using a digital multimeter.

Then check to see if oil levels are correct. The bentley manual will show you how to check this, there's a unique method involved.

Then tell us if this behaviour is there only when the car is cold, or when it is hot as well. That could be significant - would basically indicate insufficient oil, you'll have to topup and check for leaks.

You could have a clutch problem.

2 seconds to initiate shift is waaay too long.
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