Loud air sound from timing belt area - Mazda Forum
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post #1 of 13 (permalink) Old 11-05-2012, 11:07 PM Thread Starter
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Loud air sound from timing belt area

So I have a really annoying problem. It just got worse bc the tempature has dropped but whenever I start the car I get this loud shhhhhhhhhhhhhh noise coming from the timing belt area. It quiets down as the engine heats up but you can still hear it inside the cabin. If i turn the car off, even when its warm, the noise will still be loud as if it were a cold start for a few minutes.For those who have a CAI, amplify that sound by 10 and that's the noise I'm getting. And keep in mind that it is coming specifically from the timing belt area.. Any thoughts??


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post #2 of 13 (permalink) Old 11-06-2012, 03:00 AM
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2.3 or 2.5 ?
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post #3 of 13 (permalink) Old 11-06-2012, 08:45 AM
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If it's a 2.3 millenia S then it's properly the Idlerpulley bearing

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post #4 of 13 (permalink) Old 11-06-2012, 08:46 AM
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Idler pulley bearing

Zoning
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post #5 of 13 (permalink) Old 11-06-2012, 09:47 AM Thread Starter
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2.5


19x8 ROH Fury Wheels with 225/35 continental extreme contact dws
4500k Phillips HID
Cold Air Intake (thanks to Yel-low)
Cross drilled rotors
35% tint
IT'S OKAY TO DROOL A LITTLE
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post #6 of 13 (permalink) Old 11-06-2012, 10:17 AM
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if the noise is still there when the car is turned OFF, it CANNOT be mechanical like a pulley. nothing is turning. where is the carbon cannister on this car? and is the noise there more with a full or empty fuel tank?
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post #7 of 13 (permalink) Old 11-06-2012, 10:20 AM Thread Starter
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The noise isn't there where the car is turned off, just when it's on. I have no idea where the carbon canister is but I do get a strong carbon monoxide smell at times. The amount of fuel in the tank makes no difference either.


19x8 ROH Fury Wheels with 225/35 continental extreme contact dws
4500k Phillips HID
Cold Air Intake (thanks to Yel-low)
Cross drilled rotors
35% tint
IT'S OKAY TO DROOL A LITTLE
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post #8 of 13 (permalink) Old 11-06-2012, 05:56 PM
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it's a bearing that has gone. all the grease has leaked out, so as it runs the bearing heats up and it makes less noise.

you basically have to start removing stuff until you find the one that is dead. it will be VERY evident which one it is once you pull the belts off as a dead bearing usually has to be pretty trashed to start making noise.

check the accessory belt tensioner first. I bet that's it.

if not take off the belts and just give everything a spin (alternator, AC, etc)

hopefully its not one of the timing belt pulleys because then its a bitch....
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post #9 of 13 (permalink) Old 11-06-2012, 10:00 PM Thread Starter
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Okay thanks. I'll have in the shop in the next couple of weeks. Hopefully she stays running until then.


19x8 ROH Fury Wheels with 225/35 continental extreme contact dws
4500k Phillips HID
Cold Air Intake (thanks to Yel-low)
Cross drilled rotors
35% tint
IT'S OKAY TO DROOL A LITTLE
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post #10 of 13 (permalink) Old 11-07-2012, 02:06 AM
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check your vacuum hose

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