Some 2009 Mazda Tribute gasoline-powered 2.5L engines built from Oct. 27, 2008, and Nov. 28, 2008, may exhibit a high-pitched metallic whistle/whine noise during cold starts.

The noise is likely caused by the smooth idler pulley in the serpentine belt drive system. The noise will be most noticeable between 1,100-1,500 rpm and may be more noticeable during engine deceleration from 1,500 rpm.

Verify by removing the accessory drive belt (the noise should disappear).

The smooth idler pulley (A) may be the cause of a cold-start whistle or whine noise on Mazda Tribute 2.5L engines built from Oct. 27 to Nov. 28, 2008.

The smooth idler pulley (A) may be the cause of a cold-start whistle or whine noise on Mazda Tribute 2.5L engines built from Oct. 27 to Nov. 28, 2008.

Replace the smooth idler pulley assembly with P/N ZZC2-15-940.

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