1990 Ford f-250, squealing when accelerating?
My dad has a 1990 Ford F-250 Lariat. When I drive it, I've noticed that when the gas pedal is depressed around 1/3 or 1/4 of the way, the truck makes a quiet squeal like noise. It's such a high noise that my dad can't hear it (he's in his 50's btw). Nothing really changes it, like revs, if it's actually accelerating, or anything. Just hoping it isn't something serious.
Nothing big on the truck has been changed. Recently we replaced the spark plugs and wires, and put on a new distributor cap and rotor (efi system though).
Probably a belt squeal, it happens when an accessory drive belt slips slightly on a pulley. Sometimes you can adjust them, but more often they should just be replaced. They are usually under 20 or 30 bucks and take about 30 mins to install. If you have a serpentine belt they are more expensive.
1990 Ford F-250 Lariat,
http://classiccars.com/listings/view/581223/1990-ford-f250-for-sale-in-calabasas-california-91302
http://www.wikipedia.org/..._Equipment
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squeak or high pitch squeal. May be belts slipping, and/ or pulley seized or starting to seize,
if noise is whistle and not squeak, may be vacuum air values leaking oe just working normal and sound is merely frequency of noise at the speed/ rpm.
if noise is from engine why not park, and have someone rev engine, to check for noise under hood, could be anything to do with moving parts and pulleys, or vacuum and air intake,
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if not engine and only while drive, that speed/ motion causes squeal, could be simple as wind noise through body, or some parts as brakes or transmission causing noise due to actions, or something needs oiling or lubricating, or frequency is metal part scraping and may be out of alignment with structure or frame as muffler, or wheels, or axle merely wearing at point linkage,
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if belt tension pulley seized, oil/ grease, or replace,
if belt itself slipping, tighten or replace,
if part cause while moving, check underneath for wear, or test at garage with tread mill rollers, /chassis dynamometer,
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First thing to do is check the serpentine belt for tightness & wear.
Take a look at the drive belt.
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