I've recently been experiencing a high pitched whirring/whine when I start my '95 Tacoma 4x4 w/ AT in the morning. It's intermittent and doesn't sem to be related to how cold it is outside.

It sometimes sounds like a wimper, then today, it was back very loud when I start the truck, but dissipates after about 20 seconds. It wasn't terribly cold, maybe 30 degrees today. It sounds like, " wee, wee, wee..." kind of like air being let out of a balloon while stretching the opening, if this makes sense. It is consistent with the engine revs.

A/C idler pulley replaced 10,000 mi. ago; water pump recently replaced; T-case recently replaced. Should I be worried about the timing chain tensioner? Should I have the shop that did the water pump to back off the tension on something a bit? Is there anything I should follow up w/ on the T-case install? I had all of the belts checked, all good

Any help would be appreciated. I'm selling this truck but will only do that in good faith.

Thanks.

 

Is it the 3.4, could be your power steering pump, mine makes a lot of noise in the colder temps. Is your fan and alt belt tight.

 

It's a 2.7 and all belts are good, had them checked. It's consistent with the engine revs, which made me believe it was a belt.

Any thoughts appreciated, as I'm now trying to sell this and don't want to stick somebody with an intermittent issue.

Thanks