Strange 1998 4runner sound (video)

masphx

New member
Hey guys,

I bought a 1998 5speed a couple months back with 168,000 on her. Since then I have put 2,000 miles on the truck and everything seems fine. About 1,000 miles ago the truck started to make a strange sound. Can you help me diagnose it?

Here are the details...

-Normally makes sound after start up (first few miles of driving)
-Normally sound comes in at 2500 rpm (sometimes around 2000) and will only last a second unless I hover around 2500 rpm.
-Engine will not make sound while I just rev it.
-Comes from outside of vehicle (can hear it just as good from driver or passenger seat.)
-No power loss while sound happens. Truck accelerates the same.
-As far as I know sound appears throughout all five gears.
-After initial warmup and first few miles drive sound ceases to exist except for a few times.
-No vibrations or shaking. Stick does not shake any differently when sound appears.


Here is the video. You can hear the sound at :20 while truck is passing 2500 rpm in first. Sound again appears at :28-:30 in second gear. I hovered at 2500 rpm for a few seconds. Again in third gear at :39 but you can barely hear it. Rest of video is me revving the engine at a stop with no sound and then accelerating though a few gears with no sound.

Sorry about the sound quality. Have tried a couple of times to get this sound on video but seems elusive. It is pretty noticeable first hand.


1998 4runner sound - YouTube

Hopefully someone can help me out. I just want to know what is going on with the truck and if something should be looked at before it fails.

Thanks in advance for the look and the input,

Mason
 
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