Low pitched whistle sound from engine at idle?
#1
Low pitched whistle sound from engine at idle?
I never noticed a low pitch whistle sound coming from the engine when at idle on my former 2008 MCSa and lightly pressing on the gas pedal while in park probably because I usually had the a/c on and windows up here in South Florida at the time.But recently I notice the low pitched whistle sound on my 2009 MCSa since I rarely use the a/c because the weather has been cool of late and my windows are open.
I am guessing the low pitch whistle noise is coming from either the turbocharger or possibly the BOV and wonder if this is just a normal sound from the engine or should I take it in and have it looked at?
Thanks.
I am guessing the low pitch whistle noise is coming from either the turbocharger or possibly the BOV and wonder if this is just a normal sound from the engine or should I take it in and have it looked at?
Thanks.
#2
#6
#7
The sound reminds me of the whistle that I had in my E46 BMW. That turned out to be a crack in the rubber intake tube. Replacing it fixed the problem.
I'm going to try and pinpoint the issue.
Last edited by jabela; 07-16-2009 at 07:56 AM. Reason: spelling
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#8
I have the whistle as well. Mine increases with RPM and changes tone with the AC compressor on. Took it to the dealer and he started 3 others that were new and they all had it as well. Says it is normal. Sounds to me like a bearing going out but what do I know...besides if it grenades it is under warranty. Never thought I would have a car that whistled all the time...well for the 1 week out of the first month it has not been in the shop.
#9
I have started to notice it on my mcs that now has about 5k miles. It is a very loud squeel/wistle when at idle. It sounds to me like the sounds I have heard in the past from PS belts but this goes away just as soon as I touch the gas to come off idle. I am going to take it to the dealer when I get a chance to make sure it's nothing major and just have it looked at when I go in for normal service.
#11
#14
#16
Yes that is normal. It has to vent the presure since the turbo is still spinning and you have the throtle closed. My sound is only when the engine is at idle and the throttle is closed. I am not sure how that could be a water pump since it should be running all the time not just at idle.
#17
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My 09 MC whistles very softly at idle speeds as well... I assumed it was normal since it's happened since day one.
Was I incorrect? I haven't noticed any issues with performance or anything. A friend of mine who has an S just mentioned how there could be something wrong when I said something about it... it got me worried. Haha.
Was I incorrect? I haven't noticed any issues with performance or anything. A friend of mine who has an S just mentioned how there could be something wrong when I said something about it... it got me worried. Haha.
#18
Yes that is normal. It has to vent the presure since the turbo is still spinning and you have the throtle closed. My sound is only when the engine is at idle and the throttle is closed. I am not sure how that could be a water pump since it should be running all the time not just at idle.
Last edited by boxy; 07-30-2009 at 10:32 PM.
#19
The water pump inyour N14 is a friction plate type clutch, which engages only when water temp reaches preset for pump to start recirculation. At slower engine speed, and if the plate is slightly glazed, there will be a very noticable whine that will even turns some heads stopping at lights. Once engine speed picks up the the clutch engages, whine will then go away.
#20
#24
So I think there are two different sounds going on here... one that only occurs at idle then goes away and the other is RPM related.. it seems that the one at idle is the water and the one at RPM could be normal or something else..
I'm going to the dealer on Friday regarding the latter issue. Will keep everyone posted; I hope I don't hear it's normal. My friends S with 4k miles doesn't make that noise.
I'm going to the dealer on Friday regarding the latter issue. Will keep everyone posted; I hope I don't hear it's normal. My friends S with 4k miles doesn't make that noise.
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