Question about 2003 Ford F150 Regular Cab

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I have a 2003 f150 45ooo mile / noise from engine when tepature is below 10 degrees, high pitch whistle , i i let off the gas it stops.

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Your alternator has to work harder in the cold weather.
I have heard many vehicles do the same thing.
Just to make sure, check the alt, but also a leaking vacuum line will make that kind of noise, check your lines make sure they are tight and not cracked or britle.

Posted on Feb 04, 2010

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Posted on Jan 02, 2017

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I have a 2003 Jeep Wrangler that has a high pitch SQUEALING sound when I release the accelerator. Any ideas what's causing it or how to fix it?.


I know i have the same problem, and i also noticed than when i open the Hood the whistle just stops, so i figure out it must be some air cycling in or out osmewhere, I found out my air intake connected to throttle body was misplaced a weird gap was left open allowing air to whistle. u might wanna check there

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2003 PT Cruiser turbo. Has just 67k miles on it. Just began making a low pitched loud whistle sound on acceleration or load/uphill. Gets louder with greater acceleration/load, no decrease in power.


I took my car to Keller's Auto Repair in Gettysburg PA, He specializes in Chryslers. I have 04 Cruiser with 2.4 Turbo that had the same whistle noise, and check engine light on. He found code P0301. The noise was caused by the #1 Cylinder injector O ring. Check them out on facebook. They will help you.

http://www.facebook.com/#!/pages/Kellers-Auto-Repair/158207620880499

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Facts:
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2. A whistling noise is created when air travels through a hole.

Check all air pressurized ducts for holes or leaks.
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you may have a tensioner or idler pulley starting to go bad. They make a high pitched whistle when the bearings are on thier way.

Simply have someone slowly bring it up to 2000 rpm and listen with the end of a wooden broom handle touching the center bolt on each. Be careful not to get caught.

If you're not used to this you may be able to hear it whithout use of the "hearing aid"

Your drive belt may simply need dressing. You can buy this at almost any auto parts store for about 4 bucks. (dont use anthing else as you will cause the belt to stretch creating more issues)

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When i give my car gas a whistle comes from the engine. It's a high pitch continual sound. When i let off the gas the whistle stops. It sounds like it's coming from the top of the block.70k miles...


Sounds like a vacume leak, chk. for a cracked or broken vacume line or maybe one came off. Does it idle ruff? With it running open hood and listen for a low pitch whistle you may have to rev it up a little.

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