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Old 11-28-2007, 08:13 PM   #1
Jeffros Spec V
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Find noise: Win case of beer: NOISE IS FIXED

So I have this noise. Hardly noticeable at idle, if I blip the throttle (while not in gear) you can hear it wind up and then when the RPM's drop it goes away. Kinda doesn't do it when under load.

I've searched Nasioc for "inlet noise" and "weird noise" and found a bunch of threads with what I think is the same noise but to no conclusions. To be honest it sounds like the ball bearings in the turbo are ****ed but I took it out and no shaft play and it spins nice and smoothly. The noise is coming from the turbo area (or so it seems.) This noise was not occurring until I did turbo inlet, catch can, new front (header) o2 sensor.

I need to figure this out, if you find it I'll buy you a case of beer, your choice (under $30)

Last edited by Jeffros Spec V; 12-10-2007 at 12:17 AM.
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Old 11-28-2007, 08:35 PM   #2
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Do a boost leak test and spray everything down with soapy water and I bet you find your boost/vac leak?
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Old 11-28-2007, 09:09 PM   #3
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throw out bearing?
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Old 11-28-2007, 09:12 PM   #4
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Is the noise a whistle, grind, exhaust leak? What does it sound like? It only happens when you just blip the throttle in neutral? Does it make it while driving?
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Old 11-28-2007, 09:17 PM   #5
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throw out bearing?
+1 that's what I was thinking.
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Old 11-28-2007, 10:37 PM   #6
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Turbo inlet? Is it a metal intake? If so You turbo will make a funny whistle whine noise when you blip the throttle. You here this now because your intake makes the sound reverberate(sp) or echo/amplify it.
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Old 11-28-2007, 10:41 PM   #7
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I don't think it is the throw out bearing cause that would be if your clutch is depressed and you would prob hear a little chatter as well when you are sitting there. The stock intake hides all the different noises for people who aren't turbo enthusiasts and intake mods get rid of the refinement stock airboxes and pipes try to conceal.
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Old 11-28-2007, 10:57 PM   #8
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oohh mee meee mee. Uppipe leak son.
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Old 11-29-2007, 10:09 AM   #9
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Quote:
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oohh mee meee mee. Uppipe leak son.
Tight and has new gasket.


I think it's coiming from my TGV's or that area....
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Old 11-29-2007, 10:25 AM   #10
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Hmm, is it whistling? How is your idle? If you are getting a leak after your MAF sensor you will have a bad idle depending on how much air is getting through.
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Old 11-29-2007, 11:27 AM   #11
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Quote:
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Hmm, is it whistling? How is your idle? If you are getting a leak after your MAF sensor you will have a bad idle depending on how much air is getting through.


Well I threw P0102 and P0113 and went and checked out my MAF. The two screws that held the maf into my intake were loose and I guess air was getting around. I tightened them and that went away.

I am however also getting a whistling that i'm not sure if the inlet makes it sound this way or something else.

The noise is driving me freaking crazy though.
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Old 11-29-2007, 06:28 PM   #12
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Quote:
Originally Posted by Jeffros Spec V View Post
Well I threw P0102 and P0113 and went and checked out my MAF. The two screws that held the maf into my intake were loose and I guess air was getting around. I tightened them and that went away.

I am however also getting a whistling that i'm not sure if the inlet makes it sound this way or something else.

The noise is driving me freaking crazy though.
Just go back through it and tighten everything and look for unevenly tightened bolts and flanges.
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Old 11-29-2007, 07:38 PM   #13
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Just go back through it and tighten everything and look for unevenly tightened bolts and flanges.
I'll be at the meet tonight for anybody that wants to figure it out.
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Old 11-29-2007, 08:05 PM   #14
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Sounds like you may be right with the turbo problem. Go rev the car up and turn the key off, good way to see if the turbo is making noise.
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Old 11-29-2007, 08:25 PM   #15
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find someone what will let you use a lift. put the car up on the lift. have one person listen and the other operate the car.
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Old 11-29-2007, 08:28 PM   #16
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.....Jeff, I think its time to let her go lol
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Old 11-29-2007, 09:57 PM   #17
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this may sound stupid(but u would be suprised what i see) if you plumed your catch can on the vacumn side of pcv(breather) system it will wistle pretty good
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Old 11-30-2007, 07:27 AM   #18
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I checked it out last night and gave him my diagnosis, hopefully I am wrong. Its not a whistle, its more or a metal shaking/scraping noise in my opinion.
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Old 11-30-2007, 08:55 AM   #19
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Quote:
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I checked it out last night and gave him my diagnosis, hopefully I am wrong. Its not a whistle, its more or a metal shaking/scraping noise in my opinion.
rod bearings!?
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Old 11-30-2007, 09:23 AM   #20
teh DIRT
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no, not rod bearings. thatd be super bad.
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