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Old July 28th, 2018, 12:31 PM
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Herbie Herbie is offline

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Default 92 Ford f150 5.0 302 rough idle and squealing even when serpintine belts off

My truck just started squealing a very high pitch sound from engine. It has a new serpentine belt and pulleys are good. Here's were it gets crazy....took belt and ran the motor and still it squeals...it also dies while in idle...does anyone know whats going on?
Old July 30th, 2018, 08:47 AM
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Without a belt, the only things moving are the cam, crank, and the distributor. Can you tell if it's coming from the front or the back of the engine? Have you changed the oil since this has started happening? Notice any bearing material in the old oil?

Last edited by harrison28; July 30th, 2018 at 08:49 AM. Reason: typo
Old March 7th, 2019, 01:44 PM
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It sound like its from the front of the vehicle...no oil change since it started...the squealing stopped, but it still dies when at idle, also the truck jerks randomly after I drive it for a 10 minutes
Old March 7th, 2019, 02:51 PM
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Dying at idle can be a sticky idle air control valve. Jerking randomly could be misfires, which would be spark plugs, plug wires, cap, and rotor. All this can possibly be a bad MAP sensor. The squealing could be the harmonic balancer.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
Old April 19th, 2019, 06:42 PM
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This could also be the throttle position sensor. Is the check engine light on?

92 F150 XLT 2WD 5.0 302 E4OD long bed

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302 , belts , f150 , ford , idle , rough , serpintine , squealing

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