2003 4.0l chirp noise video

[Bmf725]

http://www.youtube.com/watch?v=Ne8kg_3p2PY

Here is a video of my truck making a chirp noise. watch the entire video when i turn the truck off it will make a whistling noise any ideas as to what it may be thanks.

 

[xentris02]

one of your bearings mabey? dont hold me to that cause that is a complete guess but when the bearings went out on my bmx bike it would make that noise and all kinds of other noises as it got worse. i mean if it can happen to a bearing in in a wheel of a bike why cant it happen in a bearing in a motor?

 

[99RangerBoss]

i say some type of weird vacuum leak

 

[06RangerXLT]

sounds like vacum leak. thats why it keeps going for a bit after the trucks off. pop the hood and try to find what hose it is

 

[Bmf725]

It seems to be coming mostly from the rear of the motor and front of the transmission. Is there any kind of diagram of vacuum lines so i know what is what?

 

[Big Jim M]

Do that while watching the fan... see if the fan clutch is the villian..
Big JIm

 

[sholzy]

Brake booster check valve not sealing? Brake booster will still have vacuum after the engine is off and can suck air back through a defective check valve. Remove and plug the vacuum hose to the brake booster. Check again for noise.

 

[Bmf725]

I checked the brake booster check valve and that is definitely not the culprit. I am not sure what else to check. Are there any vacuum lines on the transmission or rear of motor?

 

[dos0711]

Take the belt off and run it for a few seconds...just long enough to verify if it is there or not.

 

[Bmf725]

just removed the belt and the noise is still there. Thanks for all the suggestions!

 

[Snurfer]

its for sure a vacuum leak. does it go away if you stand on the throttle while driving?? if it does i would look for a leak on the discharge side of the plenum. if its still loud when your on the throttle, check the intake side of the plenum for any bad vacuum lines

 

[Earl43P]

About the only thing over there is the vacuum reservoir.
Should be under the airbox, bolted to the fender liner. Check its connections.

Should be a black plastic sphere. Examine it for cracks too.