1990 Ford F-150 • 4.9L 6 cylinder RWD Automatic • 180,000 miles

Hi I have a 1990 f150 xlt lariat 4.9 L. My engine squeals upon startup and gets worse if I turn on the ac when the engine is warming up. After that its fine. The power steering pump pulley has some give to it though. About 1/16". When the engine is running it doesnt seem to wobble at all. Have replaced the belt and the tensioner w pulley. Cleaned all the pulleys as well. Trying to fix this terrible sound and need help! It would be much appreciated my friend.
August 4, 2014.

Use a straight edge and check alignment of belt if the pump wobbles with the belt off see why a bent pulley can make the belt go bad and then check for oil on pulleys if any clean it all off and stop where it is coming from.

Aug 4, 2014.