small squeak at start
 

I occasionally get a small squeak from engine at start and it last for about a few minutes. Any thoughts? Thank you.

belt slipping ?

i have no clue. its a subtle sound and most might not even notice it. high pitch sound though. but as mentioned, after a couple minutes its gone. maybe timing belts are just off?

I'd check the Secondary Air System pump.

i have no clue how to check that :) is it critical if its an issue there? should i get it check out? thank you

Belt
Beginning WP failure
Beginning alternator failure
Belt pulley getting loose.

Any of these things will make noise then go away when warm.

^^^^
+ a loose spark plug....

Belt slipping ?? I doubt it. Have you felt the pressure the tensioner exerts on the belt?

The Secondary air pump(SAP) runs at cold start for about 1-1/2 - 2 minutes (Sounds like small vacuum)
If your high pitch sound is during that and goes away when pump stops, indications are bearings in SAP are dry (They can be re-greased)

Obviously if the sound is not associated with SAP then check previous posters suggested components

ok Thanks guys I have it looked at. KK I think you your description is exactly what it sounds like.

I think I have the same issue, a kind of whistle for a few seconds at start-up...
Is it difficult to re-grease those bearings?
Thanks!

There is a write up some where. Not sure if it's this forum or another
It's not hard, the pump comes apart and the bearings are accessible.
I used a grease gun with a needle adapter. It is a bit difficult getting around the seals to get grease into the bearing but can be done

There are (3) rubber isolator fitting that attach the pump to the engine. I have one that tore so be careful removing and inspect.

I ordered 3 @ $ 9.70/each but was informed that only supplier now charged $27/each
Grainger sells for around $3-$4 each