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      06-29-2018, 09:11 PM   #1
jay-rock
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Transmission Sound?

I bought this 07 328xi about 3 weeks ago with around 62.5k miles on it. Just had the transmission fluid flushed. Since the flush, shifts from 1st to 2nd seem different. Though I may just be paying a lot more attention to it now. I figured at 62.5k a flush would be safe. It was a BG machine and fluid.

Either way, when the engine is cold the shifts from 1st to 2nd sound odd to me. I've read how people don't like how these GM transmissions shift from 1st to 2nd, but I can't tell if this is what they are talking about. Its like a subtle popping (slipping?) sound. Its also like the acceleration is interrupted. Its hard to describe so I made a video of it. The first one is when the engine is cold and second is when engine is warm. When the engine is warm it seems better.

The sound is not great on these videos, the run flat tires make the road noise so loud you really can't hear anything else, so this may be futile. Just in normal Drive mode, not sport. The issue I'm referring to is when 1st gear gets to just under 2k rpm when the engine is cold.





Any help is appreciated.

Last edited by jay-rock; 06-29-2018 at 09:19 PM.
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      06-29-2018, 09:22 PM   #2
vb7200
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When you did the flush, did you allow the transmission to get to operating temp and then top it off? Youíre supposed to hold the brakes and it it into every gear for ~10 seconds and let it warm up, then go back and fill it until thereís a steady stream coming out of the filling point.
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      06-29-2018, 09:23 PM   #3
jay-rock
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My indy did the flush. He did a flush on a lexus a had a few years ago with no problems. You think I'm a little low on fluid?
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      06-29-2018, 09:29 PM   #4
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Could be. My friendís Lancer has a fluid leak and it makes some funky sounds when itís low. Thereís no fill point under the hood, you have to go under the car to the transmission pan, and thereís a bolt on the side where you fill it with a siphoning pump. You could also try resetting adaptations. I believe you have to hold the gas for a minute with the accessories on, I canít remeber off the top of my head, itís been a while.

Last edited by vb7200; 06-29-2018 at 09:38 PM.
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      06-29-2018, 10:19 PM   #5
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I reset the adaptations and it does seem better, but the engine was still warm when I drove it, so I that leads me to think they didn't put enough fluid back in.
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      06-30-2018, 03:21 AM   #6
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I'd defiantly take it back to the shop and have them double check that it's topped off.
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      07-12-2018, 06:07 PM   #7
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It was 1 1/4 quartz low. Fixed now.
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