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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 12-04-2014, 12:25 PM
emann117 emann117 is offline
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Mein Auto:
98 528i weird whistle.

So just the other day, I noticed a weird whistle when I press the gas peddle. It gets higher pitched as I press the gas more. What could this be?
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Old 12-04-2014, 12:36 PM
bobdmac bobdmac is online now
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Mein Auto: 2001 540i/6, '90 BMW k75s
It could be a number of things, but I think a vacuum leak would be high on the list, maybe around the brake vacuum booster.
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Old 12-04-2014, 12:48 PM
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JDeGraff89 JDeGraff89 is offline
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Mein Auto: 04/1997 528i Auto,
Pulleys
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Old 12-04-2014, 01:01 PM
bobdmac bobdmac is online now
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Mein Auto: 2001 540i/6, '90 BMW k75s
If it only happens when you press on the gas, then I think it's responding to a change in the intake vacuum, but this is a guess. Pulleys can also make a whistling sound--more like a screech, actually--and it might be a good idea to remove your accessory drive belt and turn all the pulleys manually, feeling for roughness or slop in the bearings.
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Old 12-04-2014, 01:59 PM
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JDeGraff89 JDeGraff89 is offline
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Mein Auto: 04/1997 528i Auto,
It could also be in the intake system itself like a pre maf thing. Or the resonator under the maf aft of the air box. But you'd probably get a code for that. Lean bank.
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Old 12-05-2014, 01:29 AM
emann117 emann117 is offline
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Yeah, it doesn't happen all the time. Very strange. Like I will just let off the gas and coast when it happens. And it stops. Then I press the gas later and it doesn't make a noise. I'll get it checked out. I need to buy the circular code reader. That's under the hood. I used an obd code reader in the port that is under the steering Column. And didn't pull any codes. Will do that again though.
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