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Old 09-01-2013, 09:44 PM   #1
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Noise under load

I have a noise when the motor is under a load, starting or going up a hill. I think it sounds like the aux brake electric motor or pump (not sure what it is) that will give you power brakes if the motor shuts down. This noise will eventually go away by itself, it will go away quicker if I let off the gas but this is working less and less as time goes on. If you turn the motor off with your foot on the brake you can hear the noise that the motor/pump makes. That's what it sounds like to me. I wonder if low vacuum could cause this this motor to come on, if so I may have a vacuum switch that is or is going bad. Don't know what turns this motor on. Anyone have any suggestions? Thanks in advance.
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Old 09-01-2013, 10:34 PM   #2
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sure it's not a vacuum leak? especially if it's getting worse. WOT should produce a decent amount of vacuum if the RPM is up.
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Old 09-01-2013, 10:49 PM   #3
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No I'm not sure if its a vacuum leak or not. I don't know if vacuum has anything to do with the electric motor/pump for aux brake system.
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Old 09-01-2013, 11:23 PM   #4
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The back up brake system with key off or engine off is probably triggered by a brake pedal switch similar to or part of the brake lite switch. That switch also sends a brake pedal activation signal to the ECM.

I would check engine fan blade. It may be rubbing on a part of the fan shroud. The shroud has been reported to have moved or interfere with the fan blade by other posters.
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Old 09-02-2013, 01:14 AM   #5
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Quote:
Originally Posted by Pete & Linda View Post
I think it sounds like the aux brake electric motor or pump (not sure what it is)
you said it sounded LIKE the motor for the brakes, not that it WAS the motor for the brakes.

If that motor was on, wouldn't the brakes be on as well? For that motor to actuate, you should need TWO things - a signal (or lack thereof) from the engine indicting it's not running, AND the brake switch. Two failures being more unlikely is the reason I suggested it might be something that sounds similar.

My 496 has an electric air pump for the emissions, at certain times it whines a bit.
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Old 09-02-2013, 10:07 AM   #6
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Pete & Linda,

I have a 2004 W22 and I have occasionally heard that motor sound too. Sometimes at or right after start up. I've had my rig for 10 yrs now and it's still a mystery to me. It must be normal. Maybe ED, Mike, Jon, Steve or Ohmy or someone with deeper knowledge of the W22 can comment.

Happy Trails,
Bill
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