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Chirping Noise Coming From 4.0

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Old 10-26-2013, 09:35 AM
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Default Chirping Noise Coming From 4.0
I'm getting this exact sound:


Does anyone have a clue what would be causing this?

When you press the gas pedal, the chirping gets faster. It happens both when idling and when driving, and seems to be intermittent.
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Old 10-26-2013, 09:45 AM
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ac compressor or other pulley?
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Old 10-26-2013, 10:38 AM
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Originally Posted by VTJeep
ac compressor or other pulley?
It's coming from the motor itself. Sounds like it's coming from the rear of the motor.
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Old 10-26-2013, 10:50 AM
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check this video.
http://www.youtube.com/watch?v=cW_wpE3hG5k#t=84
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Old 10-26-2013, 10:51 AM
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Originally Posted by thatXJguy
It's coming from the motor itself. Sounds like it's coming from the rear of the motor.
from all i cn gather maybe the CPS or synchronizer for tranny. ax-15?
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Old 10-26-2013, 07:47 PM
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Here's what you need.
Attached Thumbnails Chirping Noise Coming From 4.0-mech-steth.jpg  
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Old 10-27-2013, 09:55 AM
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Originally Posted by prcherokee
No.. it's not a belt. The noise isn't coming from anywhere near the front... it's in the back like I said.

Originally Posted by VTJeep
from all i cn gather maybe the CPS or synchronizer for tranny. ax-15?
I've got the AW4.
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Old 10-27-2013, 02:26 PM
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sounds like the idler pully for the serp belt. remove the serp belt start the motor and see if the noise goes away. check for play in the pully when you have the belt off.
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Old 03-18-2014, 08:35 PM
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Ever fix this problem? Mine is doing same thing. 90% sure its a rocker arm making the noise due to something blocking oil flow through a pushrod...
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Old 03-18-2014, 08:38 PM
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This problem was fixed with a new distributor
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Old 03-19-2014, 02:41 PM
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Mine ended up being a rocker arm.

Took this video today.

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Old 03-19-2014, 05:09 PM
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Shut that sum***** off and find out why there's no oil coming up to the rockers!!!
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Old 03-19-2014, 05:33 PM
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That's what I was thinking, those rockers should be covered in oil. Something is wrong there.
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Old 03-19-2014, 11:38 PM
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Originally Posted by cruiser54
Shut that sum***** off and find out why there's no oil coming up to the rockers!!!
Originally Posted by scottmphoto
That's what I was thinking, those rockers should be covered in oil. Something is wrong there.
Agreed! Either your lifters are shot or the pushrods are plugged to where no oil is getting pumped up to the rocker fulcrum. Thats your squeaking problem.
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Old 03-20-2014, 12:07 PM
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Originally Posted by gs69350
Mine ended up being a rocker arm.

Took this video today.

https://www.youtube.com/watch?v=iTPQp_SF_rc
Interesting. That sounds very similar to the chirp I was having, but it's not the same tone pitch.
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