whining sound when i step on the gas

dcs2k · 02-17-2010, 10:51 AM

does any one experience this problem? especially in the morning when the motor is still being warm up, step on the gas pedal will produce a whining sound.. like a faint fire siren sound that goes higher in pitch and down accordingly with the rev around 1.5k to 3k rpm.

Running on jb3 for a while and hopefully thats not the cause of it.

Chuck76 · 02-17-2010, 10:58 AM

Sound coming from the back or the rear? Sounds like the rear fuel pump. Does it whine after the car is fully warmed, driven, then stopped at a light?

mrboon · 02-17-2010, 12:43 PM

mine does it too now, i think its the fuel pump. happens to loads of 35i engines. gonna get it checked out soon... its a faint whine right?

i cant really tell where it comes from, and i only hear it when i drive away slowly.

dcs2k · 02-17-2010, 06:17 PM

i might be wrong, but the sounds seems like coming from the turbos... i just had my fuel pump replaced so shouldnt be that...

Oh Captain My Captain · 02-17-2010, 09:23 PM

Quote:

Originally Posted by sg-e89

i might be wrong, but the sounds seems like coming from the turbos... i just had my fuel pump replaced so shouldnt be that...

Based on the fuel pump threads in the M3 forums, it could still be a fuel pump problem. They could always stick in another faulty pump.

coetzejg · 02-18-2010, 03:03 AM

I have the same problem on the 3.0...posted a thread elsewhere on here. It's a whine that happens between 3 an 4 thousand revs. Narrowed it down to be the aircon....
When you hear that whine, keep the revs constant and swith the aircon switch off - it will immediately disappear. and come back when you switch it on again.

Only really happens when the aircon compressor is running constantly...mostly on hot days or first startup and the temperature being set low.

Car's going in next week to check.

Please confirm if you can replicate the same ?

mrboon · 02-18-2010, 04:57 AM

i have my aircon off most of the time, still hear it ;(

Chuck76 · 02-18-2010, 11:31 AM

Open up the hood and can you hear a whine near the airbox? The noise can really echo through the car and misdirect you on the noise origin.

Take it in to bmw. I had a tech put a stethoscope and discovered it was the rear pump that is pending failure, not the hpfp. After the replacement, whine gone.

coetzejg · 02-26-2010, 12:12 AM

Took my car in to the dealers for the aircon ( I think) whine on Wednesday past. The couldn't find an issue they say. On picking it up the evening the engine management light went on intermittendly again....so it stayed there.
Yesterday, the EML light was sorted but now the aircon is not functioning at all anymore. They will dismantle it today to see if they can track the issue. Seems like it was afterall the aircon to blime and the whinning sound was tell-tale sign of the issues to come.

Will report back on the progress, but as of now I'm not impressed with this car anymore!

penny · 06-05-2010, 10:05 AM

I had a whistling sound in the past on my 135i after a tune install.. and gets louder on acceleration. If I'm correct, we both have the same N54 engine. Check your diverter valves that it hasn't popped off. Just re-tighten it. The extra boost from the tune has done this to a few folks on 1addicts.

msimon18 · 06-05-2010, 11:46 AM

yup, me too it is the aircon..

coetzejg · 06-07-2010, 05:58 AM

The compressor unit on my aircon has been replaced twice now and no solution as yet.

mikeinaustin · 06-07-2010, 10:56 PM

i have a feeling, and only a feeling, that it is not the air conditioner. i believe that when you turn on the ac, it opens the vents and that is allowing noise from "somewhere" to be heard. when i turn off my ac, the whine goes way way down, but if you listen closely, it is actually still there. i have tried opening the hood and listening for the whine, but the engine is so loud it easily over comes the whine making it impossible to hear. therefore, i believe it is quite possible the whine isn't even coming from the engine bay. owners have had various ac parts replaced to no avail. so what is it? i have no idea.

Rubber Ducky · 06-08-2010, 06:07 AM

1. There are a lot more posts on fuel pump issues ... than there are fuel pump issues.

2. Old phrase: " turbo whine." Not saying that a few folks don't have A/C or HPFP probs, but suspect the 'problem' is just the turbos spooling up and picking up a resonance at certain RPMs and load levels. Suggest 'drive it like you stole it' and deal with real issues if they show up in some way other than could-be sounds. (Experience now with 3 N54s and so far bomb-proof.)

ChuckB · 06-08-2010, 06:32 AM

Quote:

Originally Posted by coetzejg

I have the same problem on the 3.0...posted a thread elsewhere on here. It's a whine that happens between 3 an 4 thousand revs. Narrowed it down to be the aircon....
When you hear that whine, keep the revs constant and swith the aircon switch off - it will immediately disappear. and come back when you switch it on again.

Only really happens when the aircon compressor is running constantly...mostly on hot days or first startup and the temperature being set low.

Car's going in next week to check.

Please confirm if you can replicate the same ?

+1 confirmation of this behavior, was debating posting this issue, but now I don't have to. I still don't like the noise though, takes too long to get the hair back down on my neck and it is a bit unsettling...

msimon18 · 06-08-2010, 02:07 PM

I have no turbos - it is the aircon....

coetzejg · 06-14-2010, 02:30 PM

Let me know if you learn anything new on this issue...my car is due to go back for further investigations once it comes back from the panel shop (neighbour reversed into my door).

Sansnoetic · 06-14-2010, 03:14 PM

I currently drive an '09 135i (twin turbo) but I test drove a 2011 Z4 35i last week which I understand has the new N55 engine. I immediately picked up on a similar whining noise as mentioned above, however I simply chalked it up to a bigger and louder turbo. If you find out it's anything else, I would be surprised...

jparnes1 · 06-14-2010, 03:57 PM

Quote:

Originally Posted by Sansnoetic

I currently drive an '09 135i (twin turbo) but I test drove a 2011 Z4 35i last week which I understand has the new N55 engine. I immediately picked up on a similar whining noise as mentioned above, however I simply chalked it up to a bigger and louder turbo. If you find out it's anything else, I would be surprised...

No, the 2011 Z4 retained the twin turbo N54 engine.

Sansnoetic · 06-15-2010, 03:29 PM

Quote:

Originally Posted by jparnes1

No, the 2011 Z4 retained the twin turbo N54 engine.

OK, thanks for clearing that up. I thought so, but the dealer looked it up and told me otherwise after I mentioned the noise (wtf?!). Well, still, I heard the whining and don't really care for it --especially now after realizing it's not the turbo(s) spinning up. (And don't someone comment now about just turning the music up, because that's a crap response!

Projekt35i · 07-20-2010, 12:00 AM

maybe its just the turbos?

erichui · 01-17-2011, 05:05 AM

anyone of you got anything new to share? I have always noticed a whining noise when the aircon is on during hot weather too.

However since this didn't happen much until recently so I never really thought about it, and didn't realise it could be an issue until I saw someone posting about it.

02-17-2010, 10:51 AM	#1
dcs2k Lieutenant 55 Rep 438 Posts Drives: E92 M3 Join Date: Aug 2009 Location: Singapore iTrader: (0)	whining sound when i step on the gas - s35i does any one experience this problem? especially in the morning when the motor is still being warm up, step on the gas pedal will produce a whining sound.. like a faint fire siren sound that goes higher in pitch and down accordingly with the rev around 1.5k to 3k rpm. Running on jb3 for a while and hopefully thats not the cause of it.
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02-17-2010, 10:58 AM	#2
Chuck76 Private First Class 19 Rep 181 Posts Drives: 2009 Z4 3.5i Join Date: Nov 2009 Location: Bay Area iTrader: (0)	Sound coming from the back or the rear? Sounds like the rear fuel pump. Does it whine after the car is fully warmed, driven, then stopped at a light?
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02-17-2010, 12:43 PM	#3
mrboon Lieutenant 76 Rep 561 Posts Drives: Speeeed Join Date: Oct 2009 Location: *** iTrader: (0)	mine does it too now, i think its the fuel pump. happens to loads of 35i engines. gonna get it checked out soon... its a faint whine right? i cant really tell where it comes from, and i only hear it when i drive away slowly.
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02-17-2010, 06:17 PM	#4
dcs2k Lieutenant 55 Rep 438 Posts Drives: E92 M3 Join Date: Aug 2009 Location: Singapore iTrader: (0)	i might be wrong, but the sounds seems like coming from the turbos... i just had my fuel pump replaced so shouldnt be that...
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02-18-2010, 03:03 AM	#6
coetzejg Enlisted Member 6 Rep 41 Posts Drives: 2010 Z4 3.0 M Black/red Join Date: Jun 2009 Location: Cape Town, South Africa iTrader: (0)	I have the same problem on the 3.0...posted a thread elsewhere on here. It's a whine that happens between 3 an 4 thousand revs. Narrowed it down to be the aircon.... When you hear that whine, keep the revs constant and swith the aircon switch off - it will immediately disappear. and come back when you switch it on again. Only really happens when the aircon compressor is running constantly...mostly on hot days or first startup and the temperature being set low. Car's going in next week to check. Please confirm if you can replicate the same ?
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02-18-2010, 04:57 AM	#7
mrboon Lieutenant 76 Rep 561 Posts Drives: Speeeed Join Date: Oct 2009 Location: *** iTrader: (0)	i have my aircon off most of the time, still hear it ;(
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02-18-2010, 11:31 AM	#8
Chuck76 Private First Class 19 Rep 181 Posts Drives: 2009 Z4 3.5i Join Date: Nov 2009 Location: Bay Area iTrader: (0)	Open up the hood and can you hear a whine near the airbox? The noise can really echo through the car and misdirect you on the noise origin. Take it in to bmw. I had a tech put a stethoscope and discovered it was the rear pump that is pending failure, not the hpfp. After the replacement, whine gone.
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02-26-2010, 12:12 AM	#9
coetzejg Enlisted Member 6 Rep 41 Posts Drives: 2010 Z4 3.0 M Black/red Join Date: Jun 2009 Location: Cape Town, South Africa iTrader: (0)	Took my car in to the dealers for the aircon ( I think) whine on Wednesday past. The couldn't find an issue they say. On picking it up the evening the engine management light went on intermittendly again....so it stayed there. Yesterday, the EML light was sorted but now the aircon is not functioning at all anymore. They will dismantle it today to see if they can track the issue. Seems like it was afterall the aircon to blime and the whinning sound was tell-tale sign of the issues to come. Will report back on the progress, but as of now I'm not impressed with this car anymore!
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06-05-2010, 10:05 AM	#10
penny Captain 43 Rep 829 Posts Drives: '08 135i (sold) Join Date: May 2008 Location: Las Colinas iTrader: (2)	I had a whistling sound in the past on my 135i after a tune install.. and gets louder on acceleration. If I'm correct, we both have the same N54 engine. Check your diverter valves that it hasn't popped off. Just re-tighten it. The extra boost from the tune has done this to a few folks on 1addicts. __________________ '08 135i.
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06-05-2010, 11:46 AM	#11
msimon18 Retired 19 Rep 868 Posts Drives: Z4 s30i Join Date: Mar 2007 Location: The Villages, FL iTrader: (0) Garage List 1965 Isetta 300 [0.00] 2004 1/5 Scale M3 GTR [10.00]	yup, me too it is the aircon.. __________________ M3 GTR - 1/5 scale - 4.2 HP w/ Collari hydraulic brakes - would you believe ~80 MPH on straightaway !!
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06-07-2010, 05:58 AM	#12
coetzejg Enlisted Member 6 Rep 41 Posts Drives: 2010 Z4 3.0 M Black/red Join Date: Jun 2009 Location: Cape Town, South Africa iTrader: (0)	The compressor unit on my aircon has been replaced twice now and no solution as yet.
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06-07-2010, 10:56 PM	#13
mikeinaustin First Lieutenant 42 Rep 362 Posts Drives: 2010 z4 3.0 crimson red Join Date: Sep 2009 Location: austin, tx iTrader: (0)	i have a feeling, and only a feeling, that it is not the air conditioner. i believe that when you turn on the ac, it opens the vents and that is allowing noise from "somewhere" to be heard. when i turn off my ac, the whine goes way way down, but if you listen closely, it is actually still there. i have tried opening the hood and listening for the whine, but the engine is so loud it easily over comes the whine making it impossible to hear. therefore, i believe it is quite possible the whine isn't even coming from the engine bay. owners have had various ac parts replaced to no avail. so what is it? i have no idea.
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06-08-2010, 06:07 AM	#14
Rubber Ducky Lieutenant 47 Rep 519 Posts Drives: 2020 M340i Join Date: Oct 2006 Location: Cocoa Beach FL iTrader: (1)	1. There are a lot more posts on fuel pump issues ... than there are fuel pump issues. 2. Old phrase: " turbo whine." Not saying that a few folks don't have A/C or HPFP probs, but suspect the 'problem' is just the turbos spooling up and picking up a resonance at certain RPMs and load levels. Suggest 'drive it like you stole it' and deal with real issues if they show up in some way other than could-be sounds. (Experience now with 3 N54s and so far bomb-proof.)
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06-08-2010, 02:07 PM	#16
msimon18 Retired 19 Rep 868 Posts Drives: Z4 s30i Join Date: Mar 2007 Location: The Villages, FL iTrader: (0) Garage List 1965 Isetta 300 [0.00] 2004 1/5 Scale M3 GTR [10.00]	I have no turbos - it is the aircon.... __________________ M3 GTR - 1/5 scale - 4.2 HP w/ Collari hydraulic brakes - would you believe ~80 MPH on straightaway !!
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06-14-2010, 02:30 PM	#17
coetzejg Enlisted Member 6 Rep 41 Posts Drives: 2010 Z4 3.0 M Black/red Join Date: Jun 2009 Location: Cape Town, South Africa iTrader: (0)	Let me know if you learn anything new on this issue...my car is due to go back for further investigations once it comes back from the panel shop (neighbour reversed into my door).
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06-14-2010, 03:14 PM	#18
Sansnoetic Private First Class 111 Rep 137 Posts Drives: '09 135i Join Date: Jul 2008 Location: washington Dc iTrader: (0) Garage List m [0.00]	I currently drive an '09 135i (twin turbo) but I test drove a 2011 Z4 35i last week which I understand has the new N55 engine. I immediately picked up on a similar whining noise as mentioned above, however I simply chalked it up to a bigger and louder turbo. If you find out it's anything else, I would be surprised... __________________ '09 135i, Monaco Blue, Savanna Beige, AS, ZPP, ZSP, ZCW, CA, Hi Fi, USB, PDC
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07-20-2010, 12:00 AM	#21
Projekt35i Private First Class 6 Rep 154 Posts Drives: Z4 Join Date: Jul 2010 Location: Canada iTrader: (2)	maybe its just the turbos?
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01-17-2011, 05:05 AM	#22
erichui Private 16 Rep 77 Posts Drives: E89 z4 sdrive30i AW/CR Join Date: Oct 2009 Location: Sydney, Australia iTrader: (0)	anyone of you got anything new to share? I have always noticed a whining noise when the aircon is on during hot weather too. However since this didn't happen much until recently so I never really thought about it, and didn't realise it could be an issue until I saw someone posting about it.
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