slow acceleration then sudden jump?

pierop · 04-08-2016, 10:35 AM

Hey guys,

Recently, I have this problem where I'll be stepping on the gas (about 1/4 in) and the RPMs will be stuck at 2000 rpm then suddenly after giving it a bit more gas, It'll spike to ~4000 in a jerking motion.

It's weird because the car will be hesitating up until a point where I give it enough gas. I also have rough idling in Drive (the car trembles a bit, RPMS stay around ~600 RPM).

Any ideas what could be causing this? could it be the TPS? vanos?

no MIL light. 128k miles. 325i 2006

Shane303 · 04-08-2016, 10:36 AM

reset throttle adaptations

pierop · 04-08-2016, 10:51 AM

Quote:

Originally Posted by Shane303

reset throttle adaptations

http://www.e90post.com/forums/showthread.php?t=544115

I've never heard of this, is this post legit?

Shane303 · 04-08-2016, 11:10 AM

Yes, that is how you do it (you can release the pedal after 30 seconds though) then turn off for at least 2 min

08TUNDRA · 04-08-2016, 12:50 PM

Since I bought my car ive thought it was weird how if you floor it from a stop the rpms are low and geadually rise for a second then they shoot up really fast and trigget traction control lol.

pierop · 04-08-2016, 01:00 PM

Quote:

Originally Posted by dmikhael619

Since I bought my car ive thought it was weird how if you floor it from a stop the rpms are low and geadually rise for a second then they shoot up really fast and trigget traction control lol.

I guess its a standard feature.

Volasko · 04-08-2016, 01:07 PM

Those symptoms sound like a failed ignition coil.

pierop · 04-08-2016, 01:17 PM

Quote:

Originally Posted by Volasko

Those symptoms sound like a failed ignition coil.

Well since you mention coils....

http://www.e90post.com/forums/showthread.php?p=19660983

I replaced the "faulty coil" just to be safe with a bosch coil after I saw the hole. Also replaced all the spark plugs. no misfires either.

btw, I am not the original owner of this car, I know this cars been put through a lot of shit

, but I'm the owner now so I want to take care of it.

PhaseP · 04-08-2016, 02:58 PM

If you have auto transmission they start at 2nd gear unless in sport or manual mode. You may be experiencing transmission dropping to 1st from 2nd due to demand from gas pedal. Just a guess I don't own auto but had driven a few times as loaner during warranty period years back.

pierop · 04-08-2016, 06:12 PM

Quote:

Originally Posted by Shane303

reset throttle adaptations

Cars accelerating normally now, thanks.

pierop · 04-08-2016, 06:14 PM

Quote:

Originally Posted by PhaseP

If you have auto transmission they start at 2nd gear unless in sport or manual mode. You may be experiencing transmission dropping to 1st from 2nd due to demand from gas pedal. Just a guess I don't own auto but had driven a few times as loaner during warranty period years back.

Yeah, this only happens when its not in sport mode. I did the throttle reset and its more responsive now.

ducatiti · 04-08-2016, 06:26 PM

I've read that it eventually goes back to normal. How often do you guys do this? Every gas refill?

motoguy128 · 04-08-2016, 07:27 PM

My 325i always starts in 1st gear unless I don't come to a nearly complete stop and a few other scenarios. But most of the time 1st, again, unless a rolling stop.

08TUNDRA · 04-08-2016, 11:51 PM

Quote:

Originally Posted by pierop

I guess its a standard feature.

I guess so it probably helps out the grip off the line, I just realized how atrocious my spelling was lol my bad I was on my phone in class hahah.

Shane303 · 04-11-2016, 01:20 PM

Quote:

Originally Posted by pierop

Cars accelerating normally now, thanks.

No problem, glad to help.

04-08-2016, 10:35 AM	#1
pierop Enlisted Member 16 Rep 34 Posts Drives: 325i e90 Join Date: Mar 2016 Location: Long Island, NY iTrader: (0)	slow acceleration then sudden jump? Hey guys, Recently, I have this problem where I'll be stepping on the gas (about 1/4 in) and the RPMs will be stuck at 2000 rpm then suddenly after giving it a bit more gas, It'll spike to ~4000 in a jerking motion. It's weird because the car will be hesitating up until a point where I give it enough gas. I also have rough idling in Drive (the car trembles a bit, RPMS stay around ~600 RPM). Any ideas what could be causing this? could it be the TPS? vanos? no MIL light. 128k miles. 325i 2006 Last edited by pierop; 04-08-2016 at 10:40 AM..
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04-08-2016, 10:36 AM	#2
Shane303 Private First Class 121 Rep 127 Posts Drives: BMW 335i Join Date: Jun 2015 Location: Mesa, Arizona iTrader: (0) Garage List 2009 BMW 335i [0.00]	reset throttle adaptations
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04-08-2016, 11:10 AM	#4
Shane303 Private First Class 121 Rep 127 Posts Drives: BMW 335i Join Date: Jun 2015 Location: Mesa, Arizona iTrader: (0) Garage List 2009 BMW 335i [0.00]	Yes, that is how you do it (you can release the pedal after 30 seconds though) then turn off for at least 2 min
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04-08-2016, 12:50 PM	#5
08TUNDRA Lieutenant 125 Rep 445 Posts Drives: 2008 e92 335i Join Date: Jul 2014 Location: San Diego CA iTrader: (6)	Since I bought my car ive thought it was weird how if you floor it from a stop the rpms are low and geadually rise for a second then they shoot up really fast and trigget traction control lol.
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04-08-2016, 01:07 PM	#7
Volasko Colonel 705 Rep 2,605 Posts Drives: 06 330i E90, 18 530xe G30 Join Date: Dec 2010 Location: Toronto iTrader: (2) Garage List 2018 BMW 530e M Sport [9.00] 2006 BMW E90 330i [8.28]	Those symptoms sound like a failed ignition coil.
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04-08-2016, 02:58 PM	#9
PhaseP Colonel 1007 Rep 2,108 Posts Drives: 325XI Join Date: May 2010 Location: Earth iTrader: (0)	If you have auto transmission they start at 2nd gear unless in sport or manual mode. You may be experiencing transmission dropping to 1st from 2nd due to demand from gas pedal. Just a guess I don't own auto but had driven a few times as loaner during warranty period years back.
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04-08-2016, 06:26 PM	#12
ducatiti Captain 235 Rep 712 Posts Drives: X7 Join Date: Feb 2016 Location: Bay Area iTrader: (0)	I've read that it eventually goes back to normal. How often do you guys do this? Every gas refill?
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04-08-2016, 07:27 PM	#13
motoguy128 Second Lieutenant 38 Rep 254 Posts Drives: 2006 325i Join Date: Aug 2015 Location: SW Michigan iTrader: (0)	My 325i always starts in 1st gear unless I don't come to a nearly complete stop and a few other scenarios. But most of the time 1st, again, unless a rolling stop.
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