(video) SMG Trans Unique Failure | New Clutch & Flywheel - BMW M5 Forum and M6 Forums
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post #1 of 35 Old 5th June 2014, 11:04 PM Thread Starter
umichchris
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(video) SMG Trans Unique Failure | New Clutch & Flywheel

Hey everyone, as you know ive had continual SMG trans woes over the past 18 months. This is my latest battle. My clutch is slipping badly at cruise speed. Please check out the video below.

This is what happens:

- from a dead start, the clutch engages well w/o issue
- i can shift through all gears and everything is smooth and effortless, car shifts like the day i bought it
- while cruising at regular speeds (roughly about 45 mph) the clutch seems to disengage completely
- you can literally feel the clutch disengage (think about pushing the clutch pedal in on a manual while in gear)
- the RPMs drop down to idle speed, the gear selection remains the same, the gear is still selected as you can see in the video
- if/when you hit the gas pedal say after slowing down a couple MPH, the increased RPMs have zero effect on the speed of the vehicle
- after 2500 to 3000 RPM the clutch finally reengages, but if that RPM band is reached too quickly it cycles through engagement/disengagement quickly (bouncing)
- violent shudder ensues as a result, this doesnt feel healthy for the car/clutch/transmission/rear diff so i take my foot off the gas
- the only way around all this is to engage the throttle slowly to reach 2500 RPM slowly, wait for the clutch to engage then give it full throttle

Work recently completed within the last 1,035 miles, issues began at the 700 mile mark with these new parts:

- New clutch
- New flywheel
- New throw out bearing/clutch release bearing
- New clutch position sensor (OEM) - super expensive for no [email protected] reason btw
- New SMG unit hydraulic fluid (OEM fluid)
- Clutch adaptations performed when these items were installed
- Catless headers
- Rear differential flush and new fluid (OEM fluid)
- Slave clutch cylinder replaced in 2013



What i have done so far for troubleshooting:

- had the clutch adaptions reset (huge thank you to [email protected])
- flashed the TCU with the Euro SMG tune
- reset the clutch position
- brake pad sensor is on as i need new pads, no other issues
- passenger restraint warning on due to seat mat sensor error (been an issue for 2 years now)
* alex used IPNA to read the codes and faults, no engine codes, no transmission codes present other than increase emissions warning due to the new headers - that code was cleared. i plan to have my Eurocharged tune updated soon, but first i need the trans working lol*

^^^ none of these actions taken above improved the situation unfortunately ^^^


What i think is wrong:

- the clutch and flywheel could potentially be misaligned, the car is with my local mechanic now for trouble shooting but id like to crowd source some potential fixes here
- i am removing the sprint booster, i doubt its the culprit but why not? screw it
- [email protected] told me that my battery voltage was low...makes sense given that the car hasnt really been driven in the last 18 months, ill replace that too
- bad clutch position sensor? its brand new from the dealership, but maybe its faulty?


any ideas or informed feedback welcome. thanks!


Last edited by umichchris; 5th June 2014 at 11:05 PM.
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post #2 of 35 Old 6th June 2014, 01:46 AM
jcolley
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post #3 of 35 Old 6th June 2014, 02:34 AM
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Damn Chris, sorry to hear you are still having all these issues. Hopefully it gets sorted out soon. Which shop do you take it to?
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post #4 of 35 Old 6th June 2014, 02:55 AM
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Sell it. That thing has given you nothing but issues. I would have cut the cord a while back based on all the issues you've been having.

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post #5 of 35 Old 6th June 2014, 03:19 AM
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This kind of nightmare is why I just did the smg pump, clutch, flywheel, release bearing, pivot pin, clutch fork and rear main seal all replaced at the same time. I know very well that I wont have to waste time dropping my transmission more than once to diagnose the problem and save my time from many shop visits.
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post #6 of 35 Old 6th June 2014, 04:13 AM
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Text me the codes. I can send them to my friend who runs the Bramman BMW shop. He knows everything. no joke.


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post #7 of 35 Old 6th June 2014, 07:22 PM Thread Starter
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Quote:
Originally Posted by SoCaLE39 View Post
Sell it. That thing has given you nothing but issues. I would have cut the cord a while back based on all the issues you've been having.
i cant sell it. it hasnt run properly in over a year and a half dude. august/september will make 2 years lol


plus, im not that kind of business man. when its time to sell it, its gotta be 100% good to go for the next guy. im not gonna set someone up to fail. hopefully it will go to an enthusiast and they will be right back on this board with her some day haha
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post #8 of 35 Old 8th June 2014, 08:22 PM
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Hey Chris, I wasn't suggesting doing anything shady. Sell as-is full disclosure is what I was thinking. I know you've had one thing after another with this car but there has to be a point where you cut the cord or keep cutting checks.

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post #9 of 35 Old 8th June 2014, 08:28 PM Thread Starter
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i totally understood you correctly. i just dont want to pawn off my problem on the next guy. plus, at the point...its a pride thing...i wont let this car beat me....tho it has definitely been beating my checkbook. i might be $6k to $7k in by now just in trans repair stuff over the last year and a half. but hey, i knew going into ownership that it was pricey to own/maintain. my issue is the lack of time i get to enjoy her in between breaks lol


on a happier note, my E36 M3 sedan is a riot every day. always starts up and the few problems ive had so far....ive fixed myself in my own garage






Quote:
Originally Posted by SoCaLE39 View Post
Hey Chris, I wasn't suggesting doing anything shady. Sell as-is full disclosure is what I was thinking. I know you've had one thing after another with this car but there has to be a point where you cut the cord or keep cutting checks.
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post #10 of 35 Old 8th June 2014, 08:30 PM Thread Starter
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Quote:
Originally Posted by jcolley View Post
Chris,

Can you get a laptop with INPA and TeamViewer hooked up to it?


yes, i can get it hooked back up to a computer again. but there werent any engine or trans errors posted other than the 'increased emissions' code when we checked it last.

is there something specifically i should have them pull/read?
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