light rattle/rumble noise from engine

335pm · 03-03-2015, 08:50 PM

Hi guys. Latley ive been hearing a very light rattle or rumble noise coming from my engine. Its been going on for a while and hasnt affected anything but just annoying me. It only comes sometimes when im on idle. I can get it to start by pushing the windows up or down. Sounds like thers something rattling. Any ideas what it could be?

Digitalism · 03-03-2015, 09:24 PM

Have a search on the forum for wastegate rattle.

335pm · 03-03-2015, 11:25 PM

I also have wastegate rattle. Its a seperate sound

Socket · 03-04-2015, 01:15 AM

.

Scotty89 · 03-04-2015, 04:19 AM

It could be pulley bearings that are worn?

Does it only rattle at idle?

XIX · 03-04-2015, 06:13 AM

pushing windows up and down will put pressure on alternator if battery is low. If your harmonic balancer or any of the other pulley bearings (as mentioned above) is on its way out it might get a rattle as it starts to go, could also be an issue with the alternator.

When was your battery last replaced ?

335pm · 03-04-2015, 07:45 AM

I havnt had the battery replaced ever. I dont have any problem with electrics. I alwasy leave radio on for while when cars off. Dont think its alternator. How do i check to see if its pulley bearings?

Scotty89 · 03-04-2015, 03:01 PM

Quote:

Originally Posted by 335pm

I havnt had the battery replaced ever. I dont have any problem with electrics. I alwasy leave radio on for while when cars off. Dont think its alternator. How do i check to see if its pulley bearings?

The only way I know how to check is remove the belts off the front, and roll each pulley around with your fingers.

If they feel wobbly like they've got slack/play, or if they feel stiff and gritty, then they should be replaced.

CYL · 03-17-2015, 01:59 AM

Quote:

Originally Posted by Scotty89

The only way I know how to check is remove the belts off the front, and roll each pulley around with your fingers.

If they feel wobbly like they've got slack/play, or if they feel stiff and gritty, then they should be replaced.

I have got some mysterious sound coming from the engine as well, usually when I accelerate, and rpm tends to at 2k-3k range.
if it is the pulley, is it an expensive repair work?
just want to know the roughly how much it cost so that I wont be ripped off when I go to mechanic.
Thanks.

Scotty89 · 03-17-2015, 03:22 AM

Quote:

Originally Posted by CYL

I have got some mysterious sound coming from the engine as well, usually when I accelerate, and rpm tends to at 2k-3k range.
if it is the pulley, is it an expensive repair work?
just want to know the roughly how much it cost so that I wont be ripped off when I go to mechanic.
Thanks.

The pulleys are cheap, and should be easy enough to get to.

If it's a rattle on light acceleration between 2000-3000 it may be the waste gate rattle. Mine rattles at about 2500 rpm on light acceleration.

Do you have a JB4 installed?

CYL · 03-17-2015, 03:32 AM

Quote:

Originally Posted by Scotty89

The pulleys are cheap, and should be easy enough to get to.

If it's a rattle on light acceleration between 2000-3000 it may be the waste gate rattle. Mine rattles at about 2500 rpm on light acceleration.

Do you have a JB4 installed?

No, mine is just a E92 325i

I do have a report from my last vehicle service - "Whirring noise noted from engine, especially at low rpm, possible noisy drive belt pulley, required investigation to accurately diagnose"

Thanks.

Scotty89 · 03-17-2015, 06:25 AM

Oh, on a 325 the pulleys should be easy - there is less stuff to remove and more room to move about in there.

lemonpark · 03-17-2015, 09:52 PM

i just replaced my belt tensioner and sound went a way for a day but came back, picking up the car today, will report back.

Im thinking either to alternator or valve lifters.

is it like a metallic ticking noise coming from the front of the engine?

naynay · 03-17-2015, 11:54 PM

waste gate rattles!

CYL · 03-18-2015, 12:27 AM

Quote:

Originally Posted by lemonpark

i just replaced my belt tensioner and sound went a way for a day but came back, picking up the car today, will report back.

Im thinking either to alternator or valve lifters.

is it like a metallic ticking noise coming from the front of the engine?

Hi, yes, it's like metallic ticking noise coming from the engine bay.
it's very rapidly but only last for about 2-3 sec, usually when I accelerate.
Please do let me know the result.
Thanks a lot.

for valve lifters, I thought if the car is well warmed up, and the engine oil is up to temperature, there shouldn't be any sound from the lifters?

CYL · 03-18-2015, 12:28 AM

Quote:

Originally Posted by naynay

waste gate rattles!

mine is E92 325i, got waste gate?

lemonpark · 03-18-2015, 12:52 AM

sound is still there and mines there at idle and gets faster paced when I slowly rev it, I don't know what it is, pissing me off. will take it to BMW on Friday and see what they say

Socket · 03-18-2015, 02:01 AM

Could be valve lifters there is a sticky on metallic engine noises on the forum. Plenty of you tube vids on valve lifter noise as well.

CYL · 03-18-2015, 02:59 AM

Quote:

Originally Posted by Socket

Could be valve lifters there is a sticky on metallic engine noises on the forum. Plenty of you tube vids on valve lifter noise as well.

I checked all those vids on the internet but there isn't any vid having the noise that I can hear when I accelerate.
those vids on the internet are recorded when idle.....the rapidly metal sound that I heard is when I accelerate....so, I don't know...

by the way, that rapidly metallic sound only lasts for about 2-3 sec....and only happens when I press the gas pedal to accelerate....
for constant speed with my foot on the pedal, there is no such sound.

03-03-2015, 08:50 PM	#1
335pm Enlisted Member 8 Rep 48 Posts Drives: 335i Join Date: Sep 2014 Location: melbourne iTrader: (0)	light rattle/rumble noise from engine Hi guys. Latley ive been hearing a very light rattle or rumble noise coming from my engine. Its been going on for a while and hasnt affected anything but just annoying me. It only comes sometimes when im on idle. I can get it to start by pushing the windows up or down. Sounds like thers something rattling. Any ideas what it could be?
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03-03-2015, 09:24 PM	#2
Digitalism Lieutenant 53 Rep 398 Posts Drives: BMW 335i Join Date: Jul 2013 Location: Perth, Australia iTrader: (0)	Have a search on the forum for wastegate rattle.
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03-03-2015, 11:25 PM	#3
335pm Enlisted Member 8 Rep 48 Posts Drives: 335i Join Date: Sep 2014 Location: melbourne iTrader: (0)	I also have wastegate rattle. Its a seperate sound
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03-04-2015, 01:15 AM	#4
Socket Lieutenant General 4546 Rep 11,903 Posts Drives: 335i Join Date: Nov 2014 Location: Australia iTrader: (4) Garage List 2008 BMW E92 [0.00]	. Attached Images
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03-04-2015, 04:19 AM	#5
Scotty89 Buy a 335 they said... It'll be fun they said... 117 Rep 995 Posts Drives: 2007 E92 335i Join Date: Jun 2014 Location: Melbourne, Australia iTrader: (0) Garage List 2007 BMW 335i [10.00]	It could be pulley bearings that are worn? Does it only rattle at idle?
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03-04-2015, 06:13 AM	#6
XIX Incognito 119 Rep 566 Posts Drives: 2011 e93 M3 Harrop S/C Join Date: Jan 2015 Location: Perth - Aus iTrader: (0)	pushing windows up and down will put pressure on alternator if battery is low. If your harmonic balancer or any of the other pulley bearings (as mentioned above) is on its way out it might get a rattle as it starts to go, could also be an issue with the alternator. When was your battery last replaced ?
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03-04-2015, 07:45 AM	#7
335pm Enlisted Member 8 Rep 48 Posts Drives: 335i Join Date: Sep 2014 Location: melbourne iTrader: (0)	I havnt had the battery replaced ever. I dont have any problem with electrics. I alwasy leave radio on for while when cars off. Dont think its alternator. How do i check to see if its pulley bearings?
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03-17-2015, 06:25 AM	#12
Scotty89 Buy a 335 they said... It'll be fun they said... 117 Rep 995 Posts Drives: 2007 E92 335i Join Date: Jun 2014 Location: Melbourne, Australia iTrader: (0) Garage List 2007 BMW 335i [10.00]	Oh, on a 325 the pulleys should be easy - there is less stuff to remove and more room to move about in there.
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03-17-2015, 09:52 PM	#13
lemonpark Captain 59 Rep 610 Posts Drives: '08 335i E92 Join Date: May 2014 Location: Melbourne iTrader: (0)	i just replaced my belt tensioner and sound went a way for a day but came back, picking up the car today, will report back. Im thinking either to alternator or valve lifters. is it like a metallic ticking noise coming from the front of the engine? __________________ JB4 G5 ISO \| BMS Backend Flash \| Alpina B3 TCU Flash \| AR Design Catless DP \| BMS DCI \| ER CP \| Turbosmart Race Port BOV \| Muffler Delete \| H&R Sport Springs \| BMS Cowl \| BMW Performance Alcantara Wheel \| M3 DCT Paddles \| Muse Concept and Design Interior \| 19" GTC-CX \| M3 Lip Spoiler \| Zieg CF Rear Diffuser \| Flow Designs Front Lip \| Black Grill \| RGB LED Angel Eyes \| 8000K HID \|
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03-17-2015, 11:54 PM	#14
naynay Banned 178 Rep 1,426 Posts Drives: 2006 E92 335i FBO Join Date: May 2013 Location: Melbourne Australia iTrader: (0)	waste gate rattles!
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03-18-2015, 12:52 AM	#17
lemonpark Captain 59 Rep 610 Posts Drives: '08 335i E92 Join Date: May 2014 Location: Melbourne iTrader: (0)	sound is still there and mines there at idle and gets faster paced when I slowly rev it, I don't know what it is, pissing me off. will take it to BMW on Friday and see what they say __________________ JB4 G5 ISO \| BMS Backend Flash \| Alpina B3 TCU Flash \| AR Design Catless DP \| BMS DCI \| ER CP \| Turbosmart Race Port BOV \| Muffler Delete \| H&R Sport Springs \| BMS Cowl \| BMW Performance Alcantara Wheel \| M3 DCT Paddles \| Muse Concept and Design Interior \| 19" GTC-CX \| M3 Lip Spoiler \| Zieg CF Rear Diffuser \| Flow Designs Front Lip \| Black Grill \| RGB LED Angel Eyes \| 8000K HID \|
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03-18-2015, 02:01 AM	#18
Socket Lieutenant General 4546 Rep 11,903 Posts Drives: 335i Join Date: Nov 2014 Location: Australia iTrader: (4) Garage List 2008 BMW E92 [0.00]	Could be valve lifters there is a sticky on metallic engine noises on the forum. Plenty of you tube vids on valve lifter noise as well.
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