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E36 M3 (1995-1999)

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  #1  
Old 03-30-2013, 10:35 AM
Cullenj927 Cullenj927 is offline
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Mein Auto: 98 M3 2004 330ci
Auto issue

I have an automatic 98 M3 Vert. Transmission in this car has economy manual and sport modes. The car will only launch in manual mode and then once momentum is gained switching to economy and sport shifts beautifully. Has anyone experienced this issue and if so what measures did you take. Although I know the fluid is dirty I hesitate to change it because some believe that it can worsen problems. Any input is appreciated.
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  #2  
Old 03-30-2013, 04:38 PM
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MMMGP MMMGP is offline
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Yeah, you need a new filter, seal, and a fluid flush.

A5S 310Z filter

You will need the ZF fluid (LT 71141), about 7 liters if you plan on a filter change and flush.

Liquid gold transmission fluid
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Old 03-30-2013, 08:42 PM
Cullenj927 Cullenj927 is offline
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Mein Auto: 98 M3 2004 330ci
Thanks for the reply.
Have you experienced this condition or are you guessing based on other knowledge? It would be great if it was that simple.
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Old 03-30-2013, 09:03 PM
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MMMGP MMMGP is offline
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Not this specific condition, but I've flushed a few transmissions in my day and in every case the smoothness of shifting improved.

You have to start somewhere and you stated the fluid is dirty. The flush with parts should run you under $200 and a Saturday, plus a couple of light beers.

Also, have you checked fluid level? Maybe the transmission is simply low on fluid? The fact that you need to engage the gear manually and build pressure seems to point to a fluid flow problem. Either the fluid is too thick (cruddy from age) or there is not enough of it.
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