Problem with my M3.. what is it?

818m3e92 · 03-07-2016, 09:36 PM

So my M3 does this weird thing and its 2 specific weird things that have happened and I'm hoping someone here knows what i might be or what it is!

2011 DCT m3 e92, 50k miles

1) This has happened 3 times now, i will be in D and waiting at a red light and the rev will be below 1k, and all of a sudden it starts to rev up and down and over again for about 4`5 revs and it goes from 500-1500 like as if i am barely tapping the gas and revving up and down. This is while in Drive and was waiting at a red light 3 times.

2) This is the weird one, so basically i will be driving and it will feel like as i give more gas it jerks and slows down for now reason, and then 3 seconds later its fine? So first time it happened i was in 4th gear and was kind of pushing it and all of a sudden it had a jerky feeling in the pedal and felt like it was slowing down, so i let off and put it in 5th and drove slowly and it seemed fine, second time i was in 2nd coming around a turn and it did the same thing and got a bit jerky and slowed down for 2 seconds as i gave it gas, then i let off and when i gave gas again it was fine, and the last and final time it happened i was in D going on the onramp to the freeway and it had the same jerky slowing down feeling as i gave it gas so i let off and it went away after couple seconds.

So if anyone has had this, or knows what it is or may be, please share I am curious what this is, i have a full AM warranty and hope its nothing serious but if it is SOMETHING that hopefully its covered, thank you all for your input and information!

BPMSport · 03-08-2016, 12:15 AM

Sounds like an idle control valve or a low pressure fuel sensor to me.

818m3e92 · 03-08-2016, 02:08 AM

Quote:

Originally Posted by Mike Benvo

Sounds like an idle control valve or a low pressure fuel sensor to me.

Thanks, I'm curious if there is a way to check if these have gone bad? Because all i know now is from what I've said, or a way to prove that one of these is the problem? Thanks again

Helmsman · 03-08-2016, 02:46 AM

Quote:

Originally Posted by 818m3e92

Thanks, I'm curious if there is a way to check if these have gone bad? Because all i know now is from what I've said, or a way to prove that one of these is the problem? Thanks again

Tried to scan the car? Maybe Carly could help provide indications?

MiamiE93Vert · 03-08-2016, 04:49 AM

Check your alternator.

KRZ3 · 03-08-2016, 04:56 AM

Erratic idle could be the fuel tank breather valve. It does it to me only when outside temp is below 5C and humidity high, and for the first 5 mins, but almost every time when stopping after 100 yards.
Or as Mike said, the idle control valve, or maybe just maybe the spark plugs.

dparm · 03-08-2016, 11:13 AM

Quote:

Originally Posted by Mike Benvo

Sounds like an idle control valve or a low pressure fuel sensor to me.

I'm with Mike -- and I'm leaning towards the ICV or something similar. Those are classic symptoms of a vacuum leak.

818m3e92 · 03-09-2016, 12:08 AM

These symptoms with the idle going up and down while stopped is the same as when I'm giving it gas and it slows the car down? I will have it plugged in to check the computer, as well as the alternator as indicated above and the ICV or Fuel pressure sensor! Thanks to all for the info, hopefully i can get this resolved and figured out!

dparm · 03-09-2016, 10:06 AM

Quote:

Originally Posted by 818m3e92

These symptoms with the idle going up and down while stopped is the same as when I'm giving it gas and it slows the car down? I will have it plugged in to check the computer, as well as the alternator as indicated above and the ICV or Fuel pressure sensor! Thanks to all for the info, hopefully i can get this resolved and figured out!

Yes, because there is always vacuum and it will increase/decrease with load. An engine is basically a glorified vacuum pump.

8600RPM · 03-10-2016, 09:11 AM

Throttle position sensor

03-07-2016, 09:36 PM	#1
818m3e92 First Lieutenant 44 Rep 363 Posts Drives: 2011 E92 M3 CP Jerez Black Join Date: Oct 2014 Location: los angeles CA iTrader: (2)	Problem with my M3.. what is it? So my M3 does this weird thing and its 2 specific weird things that have happened and I'm hoping someone here knows what i might be or what it is! 2011 DCT m3 e92, 50k miles 1) This has happened 3 times now, i will be in D and waiting at a red light and the rev will be below 1k, and all of a sudden it starts to rev up and down and over again for about 4`5 revs and it goes from 500-1500 like as if i am barely tapping the gas and revving up and down. This is while in Drive and was waiting at a red light 3 times. 2) This is the weird one, so basically i will be driving and it will feel like as i give more gas it jerks and slows down for now reason, and then 3 seconds later its fine? So first time it happened i was in 4th gear and was kind of pushing it and all of a sudden it had a jerky feeling in the pedal and felt like it was slowing down, so i let off and put it in 5th and drove slowly and it seemed fine, second time i was in 2nd coming around a turn and it did the same thing and got a bit jerky and slowed down for 2 seconds as i gave it gas, then i let off and when i gave gas again it was fine, and the last and final time it happened i was in D going on the onramp to the freeway and it had the same jerky slowing down feeling as i gave it gas so i let off and it went away after couple seconds. So if anyone has had this, or knows what it is or may be, please share I am curious what this is, i have a full AM warranty and hope its nothing serious but if it is SOMETHING that hopefully its covered, thank you all for your input and information! __________________ M Performance, Gintani, Macht Schnell, Ohlins, Vorshlag, yokohama...
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03-08-2016, 12:15 AM	#2
BPMSport BimmerPost Supporting Vendor 3387 Rep 7,541 Posts Drives: Harrop M3 / F10 M5 / F82 M4 Join Date: Apr 2008 Location: SoCal iTrader: (9) Garage List 2000 BMW M5 [0.00] 1990 BMW 735i Turbo [0.00] 2008 BMW M3 [7.50] 2015 BMW M3 [0.00] 2015 BMW M5 [0.00]	Sounds like an idle control valve or a low pressure fuel sensor to me. __________________ -----\| Like us on Facebook \| Instagram \|\| Tuning Information \| Remote Coding \|----- ----Visit us at www.BPMSport.com - Emotion. Driven. \| Toll Free: (888) 557-5133----
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03-08-2016, 04:49 AM	#5
MiamiE93Vert Lieutenant 97 Rep 460 Posts Drives: E93 M3 Convertible Join Date: Jan 2012 Location: Miami, FL iTrader: (0)	Check your alternator. __________________ AA Pulley, Air Filter and Tune - Full Evolve Valvetronic Exhaust - 380/355 Stoptech BBK, BBS FI's and other fun stuff.
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03-08-2016, 04:56 AM	#6
KRZ3 Private First Class 23 Rep 139 Posts Drives: E90 M3 Join Date: Dec 2015 Location: Home iTrader: (0)	Erratic idle could be the fuel tank breather valve. It does it to me only when outside temp is below 5C and humidity high, and for the first 5 mins, but almost every time when stopping after 100 yards. Or as Mike said, the idle control valve, or maybe just maybe the spark plugs. __________________ '09 E90 M3 DCT EDC, ESS VT2 625, ESS HFC, GTS DCT, D2R BBK, B16D, VORSHLAG CP, DELRIN SUB, TE37SL '00 996.1 GT3 CS
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03-09-2016, 12:08 AM	#8
818m3e92 First Lieutenant 44 Rep 363 Posts Drives: 2011 E92 M3 CP Jerez Black Join Date: Oct 2014 Location: los angeles CA iTrader: (2)	These symptoms with the idle going up and down while stopped is the same as when I'm giving it gas and it slows the car down? I will have it plugged in to check the computer, as well as the alternator as indicated above and the ICV or Fuel pressure sensor! Thanks to all for the info, hopefully i can get this resolved and figured out! __________________ M Performance, Gintani, Macht Schnell, Ohlins, Vorshlag, yokohama...
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03-10-2016, 09:11 AM	#10
8600RPM Lieutenant Colonel 657 Rep 1,749 Posts Drives: e92 m3 Join Date: Oct 2014 Location: AZ iTrader: (0)	Throttle position sensor
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