Mechanical whine when cold
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This is a discussion on Mechanical whine when cold within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; 2002 WRX Wagon, 88k, no significant mods (r sway bar, grounding wires): It's developed a distinct, fairly high-pitched whine from ...

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    Mechanical whine when cold

    2002 WRX Wagon, 88k, no significant mods (r sway bar, grounding wires):

    It's developed a distinct, fairly high-pitched whine from the front of the engine, 100% synched to engine speed, somewhere down beneath the A/C pulley. The noise is somewhat suppressed below 2,000rpm, but it comes on strong at 2,000 and higher.

    It's only really bad when cold. It is much quieter after 20mins or so of driving.

    Removing the PS/Alt belt had no effect, I did not remove and test the A/C belt.

    I've read some threads about the A/C tensioner pulley making noise, and one about a small brass pulley on the cam belt system. I don't recall their authors stating that the noise goes away once fully warmed up.

    It's on its 2nd automatic timing belt tensioner.

    >>Has anyone had specific experience with the noise being prominent only when cold? What was the culprit, and how did you solve the problem?

    Many thanks!

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  3. #2
    Registered User Hold_Fast's Avatar
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    Quote Originally Posted by GM_WRX View Post
    I've read some threads about the A/C tensioner pulley making noise, and one about a small brass pulley on the cam belt system. I don't recall their authors stating that the noise goes away once fully warmed up.
    I had this problem last winter. Replaced the pulley that you mentioned and no more noise.
    ~Stan
    '04 WRB WRX Wagon (Build) - Hard Parked, AutoX Toy
    '08 WRX ~ Daily Beaten ~ '86 BMW 325es ~ "The Chump"

    "I was raised knowing there is a replacement for displacement, it's called engineering."

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    Thanks!!

    With your evidence that it's prob the A/C tensioner pulley, I did the test that I should have done yesterday (pulled that belt too and ran it).

    Sure enough, not a hint of the whine when it had been most pronounced. The darned thing grinds and makes noise just spinning it on my finger, and it won't spin freely, period. Off to the Subie dealer tomorrow for a new pulley.

    I couldn't find a torque figure for the two pulley bracket bolts in the shop manual - what would you suggest?

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