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Old 07-08-2009, 01:34 AM   #1
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Question Chirp/Squeal Coming from Under the Hood

ok ive searched and havent found a similar chirp as mine. i live in georgia and it is chirping now so its not that its the cold chirp/squeal as some have mentioned.

My truck: 2005 SuperCab FX4 (5.4)

It chirps only at cold start (cold engine, not cold weather) and only for the first 5-10 minutes of driving until it warms up and then does not do it until the next day's first start. the weird part is that when i drive it, it only chirps when im laying OFF the gas. it stops when i am accelerating or holding constant speed, but then starts up again when i start to slow down or coast down a hill. that is the main thing that i have not seen anyone else have problems with.

there is no noticeable decrease in horsepower or any other change while its chirping. sometimes i think its only doing it when the engine is in that choke mode when you first start it up...

any help is appreciated!
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Old 07-08-2009, 04:10 AM   #2
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Could you be hearing an exhaust leak at the manifold to head joint. See alot of posts here about bolts being broken.
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Old 07-08-2009, 11:19 AM   #3
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I had the same problem with my 2003 Ranger Edge... only would chirp when it was wet (after a wash, after it rained) got worse and worse.. luckily I sold it after it had been dry a couple of days.
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Old 07-08-2009, 02:36 PM   #4
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well it does it when its dry as a bone outside.
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Old 07-08-2009, 02:38 PM   #5
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Has the surpentine (spelling?) belt been changed?
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Old 07-08-2009, 03:03 PM   #6
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Quote:
Originally Posted by Bucko View Post
Has the surpentine (spelling?) belt been changed?
nope i guess i could do that. do you think that when i press the gas it tightens up enough to stop sqealing and when i let off it lets pressure off the belt and starts sqealing again?

ive checked the belt for cracks and everything looks fine, maybe a pulley?
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Old 07-08-2009, 03:14 PM   #7
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An old (really old) trick for testing belts used to be to hold a bar of soap under the belt with light pressure; the soap would "lube" the belt for a few seconds and a squealing belt would become quiet for a minute, telling you the belt was glased.

I've never done this old trick on the new belts, as they are ribbed, so I'm not sure if it would work or not. If your belt has over 50K on it, I'd change it anyhow, and use the "gatorback" belt sold at NAPA and other parts places.

It could be a bearing in the alternator, or idler pulley, but I'd suspect the belt first. You should be able to pin point the noise with the hood open and engine running. I've also used a stick, placed on the alternator and the other end at my ear; if the bearing in the alternator is bad, the noise transfers through the stick and you'll hear it when you lightly press your ear to the stick. Another old trick if you don't have a stethiscope.
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Old 07-08-2009, 03:42 PM   #8
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ive got some plastic tubing my dad uses for similar under-hood noises.

guess ive got to wait til tomorrow as ive already started the truck today!

by the way, ive got 129k miles and never changed
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Old 07-19-2009, 12:11 PM   #9
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Did you find a fix for you problem??? I have a 2000 F150 4.2L. I have changed the serpentine belt and the belt tensioner. This didn't fix my problem! I had a friend lession and tell me it was my water pump but my truck isn't getting hot or losing power. Just that noise when I start my truck up. My truck had 140k miles on it.
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Old 07-19-2009, 12:57 PM   #10
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did u check into the cam phasers....i had mine replaced and all the weird noises disapeared
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Old 07-19-2009, 12:57 PM
 
 
 
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