2011 M3 repeatedly destroying crankshaft pos sensor on high rpm pull

CjM3 · 04-04-2024, 01:18 PM

Hey guys have an odd one for you. My car is making contact and destroying my crankshaft position sensor on high rpm pulls 7k- redline. Has anyone run into this before? I'm about to have my transmission torn apart to see what it is but figured I'd ask the community first.

omgzirra_exe · 04-04-2024, 06:08 PM

I've only ever had it vibrate loose, but not get destroyed, but which one are we talking about?

there is two, one in the lower portion of the trans and one at the side which iirc is the RPM sensor.

CjM3 · 04-04-2024, 06:35 PM

Quote:

Originally Posted by omgzirra_exe

I've only ever had it vibrate loose, but not get destroyed, but which one are we talking about?

there is two, one in the lower portion of the trans and one at the side which iirc is the RPM sensor.

It's the lower one 100% the crankshaft pos sensor. Ill get a picture of the first one that got destroyed.

Here are the pictures, the groove you can see on the top something in my trans is causing.

View post on imgur.com

amrazM · 04-05-2024, 05:09 AM

you verified thats the correct cps? if youve troubleshooted this and verified there are no obvious issues then pull the transmission out.

omgzirra_exe · 04-05-2024, 10:20 AM

yeah that's crazy... lol that might have to be a transmission pull and internal inspection as amrazM said.

DCT and 6SPD use the same part number and it also looks to be correct. but verify.

CjM3 · 04-05-2024, 12:52 PM

Quote:

Originally Posted by omgzirra_exe

yeah that's crazy... lol that might have to be a transmission pull and internal inspection as amrazM said.

DCT and 6SPD use the same part number and it also looks to be correct. but verify.

Good times lol, trans coming apart monday. Will let you guys know the results.

tdott · 04-05-2024, 01:39 PM

manual car? I wonder if a spring or something on the clutch came loose and is hitting it

CjM3 · 04-05-2024, 04:37 PM

Quote:

Originally Posted by tdott

manual car? I wonder if a spring or something on the clutch came loose and is hitting it

Yes manual, my mechanics are stumped too never seen a sensor like that. Should be interesting to see what is hitting it.

amrazM · 04-08-2024, 05:07 AM

Quote:

Originally Posted by tdott

manual car? I wonder if a spring or something on the clutch came loose and is hitting it

pressure plate straps more than likely.

CjM3 · 04-11-2024, 06:50 PM

Ended up being the flywheel decided it wanted to shed some weight and lost a few teeth.

04-04-2024, 01:18 PM	#1
CjM3 Private First Class 42 Rep 167 Posts Drives: E92 M3 Join Date: Mar 2015 Location: Bothell iTrader: (0)	2011 M3 repeatedly destroying crankshaft pos sensor on high rpm pull Hey guys have an odd one for you. My car is making contact and destroying my crankshaft position sensor on high rpm pulls 7k- redline. Has anyone run into this before? I'm about to have my transmission torn apart to see what it is but figured I'd ask the community first.
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04-04-2024, 06:08 PM	#2
omgzirra_exe Lieutenant Colonel 1490 Rep 1,701 Posts Drives: 4.4L M3, IS300 Join Date: Jun 2019 Location: Long Beach, CA iTrader: (0)	I've only ever had it vibrate loose, but not get destroyed, but which one are we talking about? there is two, one in the lower portion of the trans and one at the side which iirc is the RPM sensor. __________________ Build: ZillaSpec M3 N1 Build M3Post Track General Discussion: Discord #fakeGTS
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04-05-2024, 05:09 AM	#4
amrazM mTekMods 2148 Rep 2,905 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	you verified thats the correct cps? if youve troubleshooted this and verified there are no obvious issues then pull the transmission out. __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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04-05-2024, 10:20 AM	#5
omgzirra_exe Lieutenant Colonel 1490 Rep 1,701 Posts Drives: 4.4L M3, IS300 Join Date: Jun 2019 Location: Long Beach, CA iTrader: (0)	yeah that's crazy... lol that might have to be a transmission pull and internal inspection as amrazM said. DCT and 6SPD use the same part number and it also looks to be correct. but verify. __________________ Build: ZillaSpec M3 N1 Build M3Post Track General Discussion: Discord #fakeGTS
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04-05-2024, 01:39 PM	#7
tdott Brigadier General 3950 Rep 3,988 Posts Drives: M3 Join Date: Nov 2010 Location: South FL / 6ix iTrader: (4)	manual car? I wonder if a spring or something on the clutch came loose and is hitting it __________________ N/A S65 Headers Before/After Dyno Results
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04-11-2024, 06:50 PM	#10
CjM3 Private First Class 42 Rep 167 Posts Drives: E92 M3 Join Date: Mar 2015 Location: Bothell iTrader: (0)	Ended up being the flywheel decided it wanted to shed some weight and lost a few teeth.
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