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      Yesterday, 05:03 PM   #1
psword
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Please Help - E93 M3

Hi All, newbie to the forum, but hoping I can get some help from you all that know a hell of a lot more about BMW's than me. Please bear with me as I try to give as much detail as possible. Please also bear in mind that while I love driving good cars, I am not mechanically minded at all, so if I sound stupid, its coz I am!

So I had to put my '10 E93 M3 DCT into the shop last week due to an engine light coming on, limp mode engaged, and error code indicating Brake booster error. Shop ordered the part, fitted it, and said it was ready to pick up. As I drove away from the shop, no issues, but about 20 mins later, when the car was warm, I started noticing some very strange happenings. As I slowed to a slow speed and low revs, if I tried to accelerate, virtually nothing would happen until the revs reached approx 3,000, then power application seemed normal. The problem was, it took an eternity to reach 3,000 rpm. I would plant my foot flat to the floor, no difference. It was a though limp mode was engaged to 3,000 rpm. I then stopped the car and tried to accelerate from stop. It would lurch forward as if normal pull away, but then rapidly retard acceleration and rpm, and back to the slow rpm increase as before till it reached 3,000 rpm then normal, just like before. This happened almost without exception.

I called the shop and he said it sounds like a slipping clutch. Like I said, I am by no means an expert, but I though a slipping clutch normally results in rapidy rising revs without the corresponding increase in speed? is this different for a DCT clutch? It also seems a little too co-incidental that there was absolutely no indication of clutch slip before the brake booster problem, but as soon as it comes out of the shop, the clutch begins to slip. It is possible for sure, but a VERY big co-incidence. That makes me think something else may be in play here

The slipping clutch doesn't make a lot of sense to me. So I seek any helpful advice from you guys. Any suggestions as to what it might be? I did read about the VANOS on this forum, similar symptoms, but seems to be mainly on the E46, not so much the S65 engine found in the E93.

Any help is greatly appreciated.
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      Yesterday, 05:41 PM   #2
hlmiii
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This won't provide much help, but I've had similar situations with E46, 135 and E90 models. Virtually identical performance and symptoms.

In NO instance were there ANY considerations involving the manual or automatic or DTC clutch hardware or software. So, I don't think that would be the issue.

FWIW -
E46 - coil and/or plug problem
135 - HPFP hardware and software
E90 - fuel delivery

Good luck.
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      Yesterday, 06:06 PM   #3
psword
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Thanks hlmiii, I will look into all of those
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      Yesterday, 06:41 PM   #4
mazing M3
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I would also look into the drive by system since our cars throttle response is computer control no more wires directly attach to the throttle bodies anymore.
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