Weird mosquito sound

A

Additive Bread

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Sep 16, 2023
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I have a 2006 TJ and the other day I noticed a weird mosquito sound (or high pitched noise) coming from the hood. It’s faint whenever I’m driving, but it’s really loud whenever I’m driving between 1000-2000 RPM at 40MPH. Usually, cruising RPH is around 1500, but he’s been riding at 2000 since the issue appeared. I have a RHD and the noise is coming from the general area of the computer. I’m hoping it’s not the manifold and the oil looks clean 🙏. Anyone have an idea on what it could be?
 
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Original PCM?

@Wranglerfix is "mosquito sound" on your list of signs of a failed PCM? =)

I think at the least I'd disconnect the PCM connectors and check them for corrosion.

Your HVAC fan motor is down under there too...might want to check that too.

-Mac
 
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macleanflood said:
@Wranglerfix is "mosquito sound" on your list of signs of a failed PCM? =)
Click to expand...

:LOL:

Additive Bread said:
the other day I noticed a weird mosquito sound (or high pitched noise) coming from the hood.
Click to expand...

Do you live in the American south, and could it in fact be mosquitos about to lift off with your Jeep? :unsure:

Tell me this, does the sound happen when the radio is off?
 
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macleanflood said:
Original PCM?

@Wranglerfix is "mosquito sound" on your list of signs of a failed PCM? =)

I think at the least I'd disconnect the PCM connectors and check them for corrosion.

Your HVAC fan motor is down under there too...might want to check that too.

-Mac
Click to expand...

I have heard of screaming monkeys, but not screaming mosquitoes! 🦟 🙈
 
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macleanflood said:
Original PCM?

@Wranglerfix is "mosquito sound" on your list of signs of a failed PCM? =)

I think at the least I'd disconnect the PCM connectors and check them for corrosion.

Your HVAC fan motor is down under there too...might want to check that too.

-Mac
Click to expand...

PCM is new. First thing I replaced 2 years ago when I got it because it’s known to have issues. The HVAC though… I’ll look into it..
 
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Additive Bread said:
We listen and we don’t judge 😭
Click to expand...

image.gif
 
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wv_kid said:
do weird mosquitoes sound any different than regular mosquitoes?
Click to expand...

Florida has over 80 different species of mosquitoes, though some sources cite the number around 90. These species include native and nonnative types, with a significant number being considered disease vectors (like the Asian tiger mosquito) or nuisance pests that can transmit serious viruses such as West Nile,dengue, chikungunya, and Zika.
 
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I have an 06 and I have heard this to! I can never pin point the issue. When I heard the sound I thought it was my radio so I turned that off. I haven’t driven my jeep in months 😞 the noise does end up going way.
 
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Checked the exhaust manifold bolts yet? The back one by #6 is famous for loosening just enough to be annoying.
 

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