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      07-16-2018, 08:29 PM   #1
neepertech
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Got a N55 noise I need help with

Turn up the speakers a bit. I've been having this Groan/hum/vibration that happens ever few seconds while running. It's the womp womp sound you can hear in the vid. It's an 2011 DCT with 90k on it, The water pump and t-stat was replace at 75k.

Any ideas? Thanks guys!

*Edit: I just checked for codes and there were none.


Last edited by neepertech; 07-16-2018 at 09:19 PM.
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      07-16-2018, 09:07 PM   #2
Havocsteve
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My first guess is belt related. But you'd have to check that first. After the belts, my next guess would the flywheel and trans area.
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      07-29-2018, 07:18 AM   #3
juld0zer
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Disconnect the large vacuum line to the brake booster and see if you can eliminate/change the noise.
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      08-05-2018, 03:59 PM   #4
OneWhite35
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I've had the exact same issue for the past few weeks... unfortunately I haven't been able to diagnose it. My windshield fluid reservoir has been empty for a while... wonder if it's the windshield fluid pump?

For reference, 2012 N55 DCT at ~90k KM (~55k miles). Water pump and thermostat replaced recently. No codes either.
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      Yesterday, 10:59 PM   #5
neepertech
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So I'm thinking it has something to do with the brakes. If I touch the pedal during the hum cycle it interrupts it. I have not gotten around to pulling the vacuum like from the booster but I will report back when I do.

So possible a bad booster, hard vacuum line, or vacuum pump. any other ideas?

Thanks!
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