Small jolt after acceleration and removing foot from pedal

rlee134 · 04-30-2015, 10:55 AM

Hey All,

Have an 09 335Xi MT with about 75k -- in the process of cleaning up my front end suspension, but have been noticing a small jolt forward in the car when i step on the gas to anywhere around and before 3k then abruptly remove my foot from the gas pedal. originally i thought it was the suspension but im not sure that would be the case. Wondering if anyone else has experienced this? Could it be a fuel pump cutoff? Engine mount? something in the tranny (getting a fluid change soon)?

kind of bizarre and maybe im just paranoid as of late about small things with the car.

thanks in advance

rlee134 · 05-07-2015, 01:01 PM

no ideas?

The Convert · 05-07-2015, 01:09 PM

The car makes torque down low, the front end will usually have upward movement when you peg the gas at low rpms.

stanlalee · 05-07-2015, 02:16 PM

Mine does the same thing. I'm hoping worn mounts and suspension bushings are the culprit. I think the clutch is definitely partially responsible but exacerbated by 115k bushings and mounts. Try doing it without the clutch... On and off the gas.....and see if you get a jolt or if its only when using the clutch.

rlee134 · 05-07-2015, 03:33 PM

yup it is only when the car is in gear. youve got a couple more miles than I, but i was thinking mounts and bushings

Quote:

Originally Posted by stanlalee

Mine does the same thing. I'm hoping worn mounts and suspension bushings are the culprit. I think the clutch is definitely partially responsible but exacerbated by 115k bushings and mounts. Try doing it without the clutch... On and off the gas.....and see if you get a jolt or if its only when using the clutch.

rlee134 · 05-07-2015, 03:35 PM

that would be great if its just the torque i feel lol i have been a little paranoid lately..

Quote:

Originally Posted by The Convert

The car makes torque down low, the front end will usually have upward movement when you peg the gas at low rpms.

Miko226 · 05-07-2015, 05:06 PM

Belt tensioner is slipping.

mr.335i · 05-07-2015, 05:15 PM

This started happening on my car also a couple of days ago. I have almost 73K.

rlee134 · 05-08-2015, 11:10 AM

just replace the tesnsioner?

Quote:

Originally Posted by Miko226

Belt tensioner is slipping.

335socal · 05-08-2015, 11:19 AM

Subd. Update us if you got it fixed by replacing tensioner.

Miko226 · 05-09-2015, 12:27 PM

Quote:

Originally Posted by rlee134

just replace the tesnsioner?

when you let off on a pull your tensioner spring has probably weakened and jolts back and could be also damaging alternator clutch / pulley as well. i replaced belt tensioner / belt and idler pulleys and no more jolt but i am going to replace alternator clutch pulley soon too. The spring will also make a knocking noise that will be audible from infront of the radiator outside the car plus you can visually see the belt bouncing at idle.

Miko226 · 05-09-2015, 12:29 PM

If your clutch pulley is damaged it will not properly charge the battery. While your down there check all bearings on other pulleys and lube them.

Julian2485 · 05-09-2015, 08:07 PM

Quote:

Originally Posted by rlee134

that would be great if its just the torque i feel lol i have been a little paranoid lately..

Quote:

Originally Posted by The Convert

The car makes torque down low, the front end will usually have upward movement when you peg the gas at low rpms.

Let me know what your fix was please I have exact same car as you 09 335xi manual, I have 73k on my car and have exact same issue

rlee134 · 05-11-2015, 09:11 AM

thanks for the info Miko. I found the belt tensioner kit online for about 100$ think im going to start with that.

Quote:

Originally Posted by Miko226

If your clutch pulley is damaged it will not properly charge the battery. While your down there check all bearings on other pulleys and lube them.

rlee134 · 05-11-2015, 10:14 AM

will do. may not be for a week or so

Quote:

Originally Posted by Julian2485

Let me know what your fix was please I have exact same car as you 09 335xi manual, I have 73k on my car and have exact same issue

Miko226 · 05-11-2015, 07:31 PM

All the tensioners start to go around 80k it seems or at least start weakening. Do the belt while your down there and check the pulleys to see if the bouncing belt chewed up the edges of the idler pulleys.

euro92 · 05-11-2015, 08:37 PM

Might be the DMFW showing its age.

Miko226 · 05-11-2015, 09:28 PM

Quote:

Originally Posted by euro92

Might be the DMFW showing its age.

This is true too.

rlee134 · 05-12-2015, 10:14 AM

it feels more as if its coming from the front of the engine - im hoping its the tensior and belt and not the flywheel...

midiman369 · 05-12-2015, 04:18 PM

Mine does the same thing. 2008 335i coupe RWD, just about to hit 75k.

I've noticed that it is most prominent in the low gears and fades off significantly from 3rd gear and up. Does yours do the same thing?

I'm curious to see what the solution is if/when you find it.

~Andrew

rlee134 · 05-13-2015, 11:14 AM

absolutely the same thing - cannot tell if its coming from under me or front of the car though.. i hope to get it sorted out soon but ive been busy as hell

Quote:

Originally Posted by midiman369

Mine does the same thing. 2008 335i coupe RWD, just about to hit 75k.

I've noticed that it is most prominent in the low gears and fades off significantly from 3rd gear and up. Does yours do the same thing?

I'm curious to see what the solution is if/when you find it.

~Andrew

Julian2485 · 05-13-2015, 09:20 PM

Quote:

Originally Posted by rlee134

absolutely the same thing - cannot tell if its coming from under me or front of the car though.. i hope to get it sorted out soon but ive been busy as hell

Quote:

Originally Posted by midiman369

Mine does the same thing. 2008 335i coupe RWD, just about to hit 75k.

I've noticed that it is most prominent in the low gears and fades off significantly from 3rd gear and up. Does yours do the same thing?

I'm curious to see what the solution is if/when you find it.

~Andrew

I wonder if it could be because of either tranny mount, motor mount, or control arm bushings ?

04-30-2015, 10:55 AM	#1
rlee134 Private First Class 9 Rep 131 Posts Drives: 2005 Audi S4 Join Date: Mar 2013 Location: Boston MA iTrader: (0)	Small jolt after acceleration and removing foot from pedal Hey All, Have an 09 335Xi MT with about 75k -- in the process of cleaning up my front end suspension, but have been noticing a small jolt forward in the car when i step on the gas to anywhere around and before 3k then abruptly remove my foot from the gas pedal. originally i thought it was the suspension but im not sure that would be the case. Wondering if anyone else has experienced this? Could it be a fuel pump cutoff? Engine mount? something in the tranny (getting a fluid change soon)? kind of bizarre and maybe im just paranoid as of late about small things with the car. thanks in advance __________________ 2005 Audi S4 2009 e92 335xi 2006 Audi A6 2001 Saab 9-5 Aero
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05-07-2015, 01:01 PM	#2
rlee134 Private First Class 9 Rep 131 Posts Drives: 2005 Audi S4 Join Date: Mar 2013 Location: Boston MA iTrader: (0)	no ideas? __________________ 2005 Audi S4 2009 e92 335xi 2006 Audi A6 2001 Saab 9-5 Aero
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05-07-2015, 01:09 PM	#3
The Convert Banned 43 Rep 303 Posts Drives: 335i Join Date: Oct 2014 Location: midwest iTrader: (0)	The car makes torque down low, the front end will usually have upward movement when you peg the gas at low rpms.
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05-07-2015, 02:16 PM	#4
stanlalee Major 261 Rep 1,093 Posts Drives: 07' E92 335i manual Join Date: Oct 2013 Location: Newport News, Va iTrader: (0)	Mine does the same thing. I'm hoping worn mounts and suspension bushings are the culprit. I think the clutch is definitely partially responsible but exacerbated by 115k bushings and mounts. Try doing it without the clutch... On and off the gas.....and see if you get a jolt or if its only when using the clutch.
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05-07-2015, 05:06 PM	#7
Miko226 Captain 63 Rep 722 Posts Drives: 11' 335d Join Date: Nov 2012 Location: Boca Raton, FL iTrader: (0)	Belt tensioner is slipping. __________________ 11' m57 335d 165k Miles - JR 2, ATM Full Exhaust & Intake, Wagner FMIC, AAR Boost Pipe, AAR Swirl Delete, AAR EGR Delete 08' n54 135i FBO E85 - SOLD
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05-07-2015, 05:15 PM	#8
mr.335i Private First Class 15 Rep 188 Posts Drives: E92 335i Join Date: Jun 2011 Location: Houston,TX iTrader: (2)	This started happening on my car also a couple of days ago. I have almost 73K. __________________ E46 325i-RIP E92 335i- BMW PS\|M3 Front Arms\|FMIC\|DPS\|ER CP\|DCI\|JB4\|Connect Kit\|M Delete
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05-08-2015, 11:19 AM	#10
335socal Captain 90 Rep 704 Posts Drives: Alpine white 335 coupe Join Date: Mar 2013 Location: National city iTrader: (3)	Subd. Update us if you got it fixed by replacing tensioner.
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05-09-2015, 12:29 PM	#12
Miko226 Captain 63 Rep 722 Posts Drives: 11' 335d Join Date: Nov 2012 Location: Boca Raton, FL iTrader: (0)	If your clutch pulley is damaged it will not properly charge the battery. While your down there check all bearings on other pulleys and lube them. __________________ 11' m57 335d 165k Miles - JR 2, ATM Full Exhaust & Intake, Wagner FMIC, AAR Boost Pipe, AAR Swirl Delete, AAR EGR Delete 08' n54 135i FBO E85 - SOLD Last edited by Miko226; 05-09-2015 at 12:38 PM..
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05-11-2015, 07:31 PM	#16
Miko226 Captain 63 Rep 722 Posts Drives: 11' 335d Join Date: Nov 2012 Location: Boca Raton, FL iTrader: (0)	All the tensioners start to go around 80k it seems or at least start weakening. Do the belt while your down there and check the pulleys to see if the bouncing belt chewed up the edges of the idler pulleys. __________________ 11' m57 335d 165k Miles - JR 2, ATM Full Exhaust & Intake, Wagner FMIC, AAR Boost Pipe, AAR Swirl Delete, AAR EGR Delete 08' n54 135i FBO E85 - SOLD
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05-11-2015, 08:37 PM	#17
euro92 Private 8 Rep 61 Posts Drives: '11 M3 6MT Join Date: Dec 2010 Location: LA iTrader: (0)	Might be the DMFW showing its age.
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05-12-2015, 10:14 AM	#19
rlee134 Private First Class 9 Rep 131 Posts Drives: 2005 Audi S4 Join Date: Mar 2013 Location: Boston MA iTrader: (0)	it feels more as if its coming from the front of the engine - im hoping its the tensior and belt and not the flywheel... __________________ 2005 Audi S4 2009 e92 335xi 2006 Audi A6 2001 Saab 9-5 Aero
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05-12-2015, 04:18 PM	#20
midiman369 New Member 2 Rep 5 Posts Drives: 08 Montego Blue 335i Coupe 6MT Join Date: Nov 2013 Location: Northern NJ iTrader: (0) Garage List 2008 BMW 335i Coupe [7.00]	Mine does the same thing. 2008 335i coupe RWD, just about to hit 75k. I've noticed that it is most prominent in the low gears and fades off significantly from 3rd gear and up. Does yours do the same thing? I'm curious to see what the solution is if/when you find it. ~Andrew __________________ 2008 Montego Blue 335i Coupe 6MT; Dinan Stage 3: Oil Cooler, Intercooler, Cold Air Intake, Strut Tower Brace, Limited Slip Differential; BMW Performance Exhaust.
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