05-23-2024, 02:19 AM | #1 |
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M235 jerky upshifts. Bad tune or transmission issue?
Had a nightmare repairs with my m235i. Went for stage 1 tune, then they noticed that there's a leaky transfer case. As the shop didn't work on transfer cases, they recommended other shop. I brought car to them, they fixed the issue, however when fitting transfer case back they cracked, AT case, then they fixed that. Now it all seemed fine, however I get jerkiness in shifts especially when I hold rpms right before and upshift in sport mode, I feel slight jerkiness. When it warms up, the shifts are buttery smooth. At first I thought it has something to do with transmission, but as far as I think, if there was something wrong with transmission the issue would persist no matter the temperature of the transmission.
Now I think the jerkiness comes from tuning, like there's some kind of ecu limitation. Has anyone experienced these symptoms, should I just detune/retune my car or maybe the issue maybe actually more serious than that and my headache will continue? |
05-24-2024, 05:17 AM | #5 |
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Car doesn't throw any codes.
Honestly thinking about doing full maintenance this summer, including transmission, detuning and enjoying the car in it's stock form. As there was zero issues before I decided to tune it. However, yesterday and today car drove like a dream. Last edited by 370_n55; 05-24-2024 at 05:25 AM.. |
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05-24-2024, 08:43 AM | #6 | |
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05-24-2024, 11:50 AM | #8 |
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Check your tranny fluid level.
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05-25-2024, 09:06 AM | #10 |
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