Squeak when changing gear

Abzynthe · 07-16-2018, 11:57 AM

Has anyone else with MPPSK experienced a loud squeak from the exhaust when changing gear at high revs with the paddles?

bimmer456 · 07-16-2018, 12:01 PM

That happens with or without mppsk. It is the belt slippage due to rapid changing of engine speed when shifting as the ZF shifts pretty fast. How loud is it?

Abzynthe · 07-16-2018, 12:02 PM

Oh right. Yeah does sound like a slipping belt come to think of it.
It is quite loud. Enough to drown out the fart noise the exhaust makes when changing lol.

BMW in NE · 07-16-2018, 12:08 PM

Quote:

Originally Posted by bimmer456

That happens with or without mppsk. It is the belt slippage due to rapid changing of engine speed when shifting as the ZF shifts pretty fast. How loud is it?

Which component do you think is causing the slippage? I'm guessing the A/C since it only seems to do it for most of us when the A/C is on? I wonder if there needs to be an adjustment to the clutches in the A/C compressor that will allow the pulley to spin with a little less effort (causing less belt slippage during the hard shifts). I dunno

Abzynthe · 07-16-2018, 12:08 PM

Found this on another thread. It was this sound but louder.

Wise340i · 12-30-2018, 01:41 PM

I’m glad I’ve picked up on this as bmw have had the car 3 times and said there’s nothing wrong with it, even sent them the clip I have of it screeching(which doesn’t do it justice) as it sounds horrendous and worrying.

My warranty runs out in 4 weeks

Wise340i · 12-30-2018, 01:47 PM

Hein Jockins · 08-15-2021, 12:00 AM

Quote:

Originally Posted by Abzynthe

Found this on another thread. It was this sound but louder.

Has anyone been able to diagnose this sound? I've searched search through the depths of the forums all to no avail.

Hein Jockins · 08-15-2021, 11:00 PM

Quote:

Originally Posted by Bars111

Some say it’s the exhaust valve.

Interesting. Sounds like it's coming from the front of the car, but I'll look into it, as I'm out of options.

chris-c · 08-16-2021, 07:32 AM

Turn your AC off and try again

I'm 99% sure its most peoples AC belts.

chris-c · 08-16-2021, 07:47 AM

This covered many things....
https://f30.bimmerpost.com/forums/sh...1273550&page=9

Hein Jockins · 08-16-2021, 06:44 PM

Quote:

Originally Posted by chris-c

This covered many things....
https://f30.bimmerpost.com/forums/sh...1273550&page=9

Awesome--Thank you! Definitely didn't find this post.

I live in Alabama, USA where AC is always on, so never noticed this. But this gives my mechanic and me a start. Hopefully I can rid the squeak.

07-16-2018, 11:57 AM	#1
Abzynthe Colonel 1388 Rep 2,125 Posts Drives: BMW 440i Gran Coupe LCI Join Date: Jan 2017 Location: UK iTrader: (0)	Squeak when changing gear Has anyone else with MPPSK experienced a loud squeak from the exhaust when changing gear at high revs with the paddles? __________________ Previous: 2010 F01 740d M Sport \| 2015 F36 420d M Sport Current: 2018 F36 440i M Sport (Stage 1 BM3, xHP stage 3)
	Appreciate 0 Tweet Quote

07-16-2018, 12:01 PM	#2
bimmer456 Major General 2960 Rep 5,992 Posts Drives: 340i Join Date: Nov 2016 Location: Pasadena, CA iTrader: (0)	That happens with or without mppsk. It is the belt slippage due to rapid changing of engine speed when shifting as the ZF shifts pretty fast. How loud is it?
	Appreciate 0 Quote

07-16-2018, 12:02 PM	#3
Abzynthe Colonel 1388 Rep 2,125 Posts Drives: BMW 440i Gran Coupe LCI Join Date: Jan 2017 Location: UK iTrader: (0)	Oh right. Yeah does sound like a slipping belt come to think of it. It is quite loud. Enough to drown out the fart noise the exhaust makes when changing lol. __________________ Previous: 2010 F01 740d M Sport \| 2015 F36 420d M Sport Current: 2018 F36 440i M Sport (Stage 1 BM3, xHP stage 3)
	Appreciate 0 Quote

07-16-2018, 12:08 PM	#5
Abzynthe Colonel 1388 Rep 2,125 Posts Drives: BMW 440i Gran Coupe LCI Join Date: Jan 2017 Location: UK iTrader: (0)	Found this on another thread. It was this sound but louder. __________________ Previous: 2010 F01 740d M Sport \| 2015 F36 420d M Sport Current: 2018 F36 440i M Sport (Stage 1 BM3, xHP stage 3)
	Appreciate 0 Quote

12-30-2018, 01:41 PM	#6
Wise340i New Member 1 Rep 12 Posts Drives: 2019 440i GC Join Date: Dec 2018 Location: Berkshire iTrader: (0)	340i gear change screech I’m glad I’ve picked up on this as bmw have had the car 3 times and said there’s nothing wrong with it, even sent them the clip I have of it screeching(which doesn’t do it justice) as it sounds horrendous and worrying. My warranty runs out in 4 weeks
	Appreciate 0 Quote

12-30-2018, 01:47 PM	#7
Wise340i New Member 1 Rep 12 Posts Drives: 2019 440i GC Join Date: Dec 2018 Location: Berkshire iTrader: (0)	Squeak
	Appreciate 0 Quote

08-16-2021, 07:32 AM	#10
chris-c Lieutenant Colonel 901 Rep 1,801 Posts Drives: F31 340i RWD Join Date: Feb 2018 Location: Kent iTrader: (0)	Turn your AC off and try again I'm 99% sure its most peoples AC belts. __________________ Europe's fastest (stock block) *F31 340i RWD* \| MPPSK \| XHP 3 \| Pure800 \| Port Meth \| Dorch 2 HPFP \| MG Flasher**
	Appreciate 1 Hein Jockins92.50 Quote

08-16-2021, 07:47 AM	#11
chris-c Lieutenant Colonel 901 Rep 1,801 Posts Drives: F31 340i RWD Join Date: Feb 2018 Location: Kent iTrader: (0)	This covered many things.... https://f30.bimmerpost.com/forums/sh...1273550&page=9 __________________ Europe's fastest (stock block) *F31 340i RWD* \| MPPSK \| XHP 3 \| Pure800 \| Port Meth \| Dorch 2 HPFP \| MG Flasher**
	Appreciate 1 Hein Jockins92.50 Quote