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Old 04-17-2022, 12:35 AM   #1
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Default Why is there a cicada stuck in my KA24?

96 4wd D21 Hardbody. The truck started making a sound exactly like a cicada (sort of a loud metallic buzzing for those of you who haven't spent time in the southern states) which starts when the motor reaches a certain rpm. Here's the problem, I live in Alaska and it started this winter in below-zero conditions, so I'm pretty sure it's not just a big bug in there.



It begins suddenly (doesn't increase or decrease volume or change tone while it's going) and ends just as suddenly once you decrease engine speed. I have a base model with no tach, so I can't tell you what RPM it is, but it corresponds to about 52 mph in 4th gear, 63 mph in 5th gear. Doesn't seem to matter which gear you are in or if the truck is in 4H or 2H. Although I suppose I could just look at it as a reminder to shift up like those newer cars have, I'm worried it might be trying to tell me something. Also everyone behind me in the two lane road with a 65 mph speed limit is getting pretty sick of me going 63. Any ideas?
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Old 04-17-2022, 12:51 AM   #2
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Inside the cab, outside the cab, engine compartment, under the truck front/middle/back?

Piece of paper stuck in the blower motor can make that sound.
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Old 04-17-2022, 06:35 PM   #3
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One thing to check is the radiator fan -- see if it is loose, blades hitting the shroud or cracked, hub's shaft wobbly, ...
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Old 04-17-2022, 07:44 PM   #4
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Quote:
Originally Posted by dvdswan View Post
Inside the cab, outside the cab, engine compartment, under the truck front/middle/back?

Piece of paper stuck in the blower motor can make that sound.



Sounds like it's coming from the engine compartment or the front part of the drive train. Under-the-hood region generally.


It happens with the heater blower on or off (I assume that is the blower motor that you're talking about?
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Old 04-17-2022, 08:45 PM   #5
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Quote:
Originally Posted by LugNut1990 View Post
One thing to check is the radiator fan -- see if it is loose, blades hitting the shroud or cracked, hub's shaft wobbly, ...

hmmm... good idea. checked it though. hub feels solid, no play. no signs of cracked or deformed blades on the fan or damage or looseness in the housing...
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Old 04-17-2022, 09:12 PM   #6
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Something loose inside the muffler or cat?

My girlfriends crv makes some buzzing sounds at specific rpm’s… that’s my guess. Annoying with windows down, but not at the point yet where I feel like tackling it.
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Old 04-18-2022, 01:35 AM   #7
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Has your Hardbody been upgraded to electric fans?
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Old 04-18-2022, 01:39 AM   #8
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This is a video I put up on Tiktok for all of you who don't know what a cicada bug is.

https://vm.tiktok.com/ZTdCXEFKf/
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Old 04-19-2022, 10:42 AM   #9
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Cut yourself a length of broomstick about two feet long, and stick it against parts of the engine with the other side in your ear. Move it from place to place. It won't take you long to narrow down where the noise is coming from.
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