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Old 06-28-2009, 06:44 PM   #1
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Chirping noise from engine when warmed up

I'm getting a chirping noise from the engine once it gets warmed up. It is definitely temperature-related, because it takes longer to start chirping in the winter time. Anyways, once the engine is warmed up, the chirping starts. It isn't the power steering pump because I took that belt off and the noise continued. I tried belt dressing on the belt going to the alternator, but that didn't change anything. That leaves either the water pump or the vibration damper/harmonic balancer. Anyone else experience this, or might have any ideas on narrowing it down further? The pitch of the chirp does seem to change slightly with the RPM of the engine.

87 YJ with 258 I6 (reman with 3K miles on it).

Thanks for any help, this chirping noise is really annoying at stop lights...

Chad

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Old 06-28-2009, 08:49 PM   #2
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do you live on a farm?

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Old 06-28-2009, 09:14 PM   #3
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Would You have a video of the sound ?
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Old 06-28-2009, 09:26 PM   #4
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that would be a picture of sound waves
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Old 06-28-2009, 09:27 PM   #5
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No, not on a farm. Why???
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Old 06-28-2009, 09:29 PM   #6
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Would You have a video of the sound ?
Nope, no audio of the sound. Sorry.
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Old 06-28-2009, 09:37 PM   #7
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Have you checked the idle pulley, belt tensioner, and fan clutch? I think the chirp I had was cured with the idle pulley and it was more of a squeal that was coming from the fan clutch (the dealership thought it was the belt tensioner, but it didn't go away til the fan clutch was replaced).
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Old 06-28-2009, 10:29 PM   #8
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Have you checked the idle pulley, belt tensioner, and fan clutch? I think the chirp I had was cured with the idle pulley and it was more of a squeal that was coming from the fan clutch (the dealership thought it was the belt tensioner, but it didn't go away til the fan clutch was replaced).
Thanks for the input! I don't have an idle pulley or belt tensioner, as I don't have the serpentine belt setup. I have two belts, one runs out to the power steering pump and the other runs out to the alternator.

I also replaced the stock pulley fan with an electric fan, but had to put the pulley itself back on in order to get the belts right.

Chad
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Old 06-29-2009, 09:29 AM   #9
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Thanks for the input! I don't have an idle pulley or belt tensioner, as I don't have the serpentine belt setup. I have two belts, one runs out to the power steering pump and the other runs out to the alternator.

I also replaced the stock pulley fan with an electric fan, but had to put the pulley itself back on in order to get the belts right.

Chad
Well shoot . . . I sure struck out!!! Sounds like you need a new radio!!!
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Old 06-29-2009, 08:46 PM   #10
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I'm going to try a new water pump and see if that fixes it. I'll post my results...

Chad
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Old 06-30-2009, 06:52 AM   #11
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Not sure about your year, but some 4.2L YJ's had an intake manifold (electric) heater.
This comes on at startup & goes off after the sensor gets warmed up. It draws a lot of amps & can cause the alternator belt to slip if not tight enough.

But this causes belt squeal until warmup, not after.
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Old 06-30-2009, 07:04 AM   #12
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Buckshot500,

Thanks for your input! Greatly appreciated! I got rid of all sensors when I replaced the exhaust manifold/computer-controlled carb with a header and straight carb. Thanks for checking, though!

Chad
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Old 06-30-2009, 07:08 AM   #13
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Buckshot500,

Thanks for your input! Greatly appreciated! I got rid of all sensors when I replaced the exhaust manifold/computer-controlled carb with a header and straight carb. Thanks for checking, though!

Chad
That intake manifold heater will still work after the Nutter, & should be reconnected if possible. It's sensor is located just behind the carb base on the intake.
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Old 07-04-2009, 01:04 PM   #14
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OK, the water pump has been replaced and still with the chirp!

I took the alternator offline and it still makes the noise. The only thing left is the harmonic balancer/vibration damper. I did read online that someone had a chirp issue and it was fixed by replacing this. Anyone out there have any experience with this?

Chad
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Old 07-04-2009, 01:59 PM   #15
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if you spray the belt down with wd40 will it stop chirping?

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