Fluctuations right before shift

Maniac0908 · 09-13-2016, 09:19 AM

So ill be driving in sport mode. Around 2k-3k right before it shift it will start flucuating. You can feel the car bogging and even see my rpms going up and down a little. Goes back to normal once it shifts. If i hold it at those rpms and not let it shift it will keep doing it. Anyone every experienced this? Im hoping its something simple like a sensor and not my tranny taking a shit. Let me know if anyone has some idea of where to start troubleshooting. Thanks

Maniac0908 · 09-14-2016, 06:09 AM

Bump

Maniac0908 · 09-15-2016, 07:02 AM

Anyone? It happens closer to 3k and only during moderate throttle. Wont do it at wot

SugarLand335i · 09-15-2016, 07:39 AM

I don't know, but I thought it was kind of normal for sport mode since your car won't shift until 3k RPM. I just always push it over the top to the next gear, never thought anything of it.

Gohan335i7 · 09-16-2016, 12:25 PM

Hmm... I have a similar issue, but was told it is completely normal. As long as it doesn't go over 1000 rpm at once when it does goes up. I noticed this after installing DCI. Thinking it may have to do with the extra air coming in, but I am no mechanic. : popcorn:

thakid22 · 09-24-2016, 06:03 AM

Quote:

Originally Posted by Maniac0908

So ill be driving in sport mode. Around 2k-3k right before it shift it will start flucuating. You can feel the car bogging and even see my rpms going up and down a little. Goes back to normal once it shifts. If i hold it at those rpms and not let it shift it will keep doing it. Anyone every experienced this? Im hoping its something simple like a sensor and not my tranny taking a shit. Let me know if anyone has some idea of where to start troubleshooting. Thanks

Post a video, for more accurate assistance.

Maniac0908 · 09-24-2016, 06:18 PM

Quote:

Originally Posted by thakid22

Post a video, for more accurate assistance.

Will do.

LQQKOUT · 09-24-2016, 10:50 PM

You should do a search for "oscillation or surging" I know there's a long discussion on one of the other forums. I don't think anyone found a solution yet. I had it, than it went away and now it's back. I think for me it has to due with running E85.

NoQuarter · 09-25-2016, 07:19 AM

Mine is Z4 35is. I am getting surging at moderate throttle cruising speed. Anywhere around 2500-3000 rpm. Not about to shift or anything like that. Could be at 30mph or 75.

I have not been able to log anything yet, and I when i look at the rpms gauge I can't visually see any difference but I sure feel it. So does my passenger.

I am running MHD v7. Tried 2 different maps.

Maniac0908 · 09-25-2016, 05:51 PM

Quote:

Originally Posted by NoQuarter

Mine is Z4 35is. I am getting surging at moderate throttle cruising speed. Anywhere around 2500-3000 rpm. Not about to shift or anything like that. Could be at 30mph or 75.

I have not been able to log anything yet, and I when i look at the rpms gauge I can't visually see any difference but I sure feel it. So doues my passenger.

I am running MHD v7. Tried 2 different maps.

Same as me man.

NoQuarter · 09-26-2016, 09:58 AM

check out this discussion also...

boo XX sta XX ddict. XX com/showthread.php?69941-Oscillating-throttle-issue

09-13-2016, 09:19 AM	#1
Maniac0908 Major 167 Rep 1,415 Posts Drives: Alpine White 07 335xi Sedan Join Date: Feb 2013 Location: Towson, MD iTrader: (2)	Fluctuations right before shift So ill be driving in sport mode. Around 2k-3k right before it shift it will start flucuating. You can feel the car bogging and even see my rpms going up and down a little. Goes back to normal once it shifts. If i hold it at those rpms and not let it shift it will keep doing it. Anyone every experienced this? Im hoping its something simple like a sensor and not my tranny taking a shit. Let me know if anyone has some idea of where to start troubleshooting. Thanks __________________ 2007 335XI SEDAN // JB4 G5 // BMS METH KIT // VRSF DOWNPIPES // AFE DCI // ER CP W/ TIAL BOV // MMP SILICONE INLETS // XHP STAGE 3 AT FLASH // TREBILA BEF // BMS OCC // VRSF EXHAUST // FUEL-IT STAGE 2 LPFP // VRSF FMIC // PRECISION RACEWORKS IGNITION SYSTEM // CATUNED COILOVERS // CIC AND COMBOX RETROFIT //
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09-14-2016, 06:09 AM	#2
Maniac0908 Major 167 Rep 1,415 Posts Drives: Alpine White 07 335xi Sedan Join Date: Feb 2013 Location: Towson, MD iTrader: (2)	Bump
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09-15-2016, 07:02 AM	#3
Maniac0908 Major 167 Rep 1,415 Posts Drives: Alpine White 07 335xi Sedan Join Date: Feb 2013 Location: Towson, MD iTrader: (2)	Anyone? It happens closer to 3k and only during moderate throttle. Wont do it at wot
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09-15-2016, 07:39 AM	#4
SugarLand335i New Member 6 Rep 10 Posts Drives: 2008 335i Sport Join Date: Jun 2016 Location: Houston iTrader: (0)	I don't know, but I thought it was kind of normal for sport mode since your car won't shift until 3k RPM. I just always push it over the top to the next gear, never thought anything of it.
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09-16-2016, 12:25 PM	#5
Gohan335i7 Captain 312 Rep 766 Posts Drives: 335i Join Date: Nov 2015 Location: Florida iTrader: (0) Garage List 2010 335i [10.00]	Hmm... I have a similar issue, but was told it is completely normal. As long as it doesn't go over 1000 rpm at once when it does goes up. I noticed this after installing DCI. Thinking it may have to do with the extra air coming in, but I am no mechanic. : popcorn:
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09-24-2016, 10:50 PM	#8
LQQKOUT Lieutenant 102 Rep 416 Posts Drives: 335XI Join Date: Jul 2011 Location: United States iTrader: (4)	You should do a search for "oscillation or surging" I know there's a long discussion on one of the other forums. I don't think anyone found a solution yet. I had it, than it went away and now it's back. I think for me it has to due with running E85.
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09-25-2016, 07:19 AM	#9
NoQuarter Captain 165 Rep 906 Posts Drives: 2008 535xi / 2011 Z4 35Is Join Date: Jan 2011 Location: Indiana iTrader: (0) Garage List 2018 BMW X2 [0.00] 2008 535xi [0.00] 2011 Z4 35is [0.00]	Mine is Z4 35is. I am getting surging at moderate throttle cruising speed. Anywhere around 2500-3000 rpm. Not about to shift or anything like that. Could be at 30mph or 75. I have not been able to log anything yet, and I when i look at the rpms gauge I can't visually see any difference but I sure feel it. So does my passenger. I am running MHD v7. Tried 2 different maps.
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09-26-2016, 09:58 AM	#11
NoQuarter Captain 165 Rep 906 Posts Drives: 2008 535xi / 2011 Z4 35Is Join Date: Jan 2011 Location: Indiana iTrader: (0) Garage List 2018 BMW X2 [0.00] 2008 535xi [0.00] 2011 Z4 35is [0.00]	check out this discussion also... boo XX sta XX ddict. XX com/showthread.php?69941-Oscillating-throttle-issue
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