High pitched whining at 50MPH+ when accelerating (1 Viewer)

Joined
Oct 13, 2020
Messages
5
Location
Michigan
Car specs:

  • 1992 FJ80
  • 4.0L
  • Auto
  • Gas
  • 180K Miles

It's the first time I've taken the car on the freeway, it was not running before but I got it working at this point so it's my first time on the freeway.

I noticed when I hit 50-55 a noise kicks only when I am accelerating, as soon as I take my foot off the pedal, it goes completely away. It sounds like it's coming from the front suspension. I've been able to find a few threads on this topic but really no suggestions on what I should start looking at first. Any help appreciated..
 

LandLocked93

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Jun 11, 2018
Messages
644
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Colorado
Low hanging fruit, as it's been sitting:
1) top off front diff fluid.
2) top off center diff fluid.
3) grease front shaft u/js and yoke.
4) check your knuckle balls for dryness. You typically want 2/3rds of the ball to show a thin film of grease (bottom to top). Add moly into inspection port on the knuckle if necessary. I do 50 pumps of the grease gun (with zerk connector off) and re-eval.

As you describe, the noise is impacted when you're on and off the accelerator. This points to drive line components - everything from the center diff out to the knuckles.

Mine whines at certain speeds, but it's slight and not concerning in the least. I kinda like the mechanical orchestra, as it were.
 
Joined
Feb 28, 2012
Messages
996
Location
N. Phx
Is it a whine or is it a whistle? If its more like a whistle and only under 1/2-2/3 throttle at that speed, it's the exhaust collector doing the classic "80 whistle".

Don't be offended, I noticed you only have 4 posts here, and its a simple thing if its just the stock whistle,
 

leonard_nemoy

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Jan 19, 2005
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2,203
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South west utah
Jack up the front end and forcefully try to rock your tires. Do this twice, once with your hands in the 12 and 6 o'clock position. There should be no play or looseness, if there is it would indicate loose wheel bearings. Wheel bearings can make all sorts of noises at speed.

Do the same thing with your hands at the 9 and 3 o'clock position. Again there should be no play. This is how you check tie rods. Worn tie rods aren't going to make a noise like you described, but you should still check them if you have the front tire in the air.

You might also want to check your pulley's and belts. Belts and seized or worn out pulley's can make high pitched noises also.

Goodluck
 
Last edited:

leonard_nemoy

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Is it a whine or is it a whistle? If its more like a whistle and only under 1/2-2/3 throttle at that speed, it's the exhaust collector doing the classic "80 whistle".

Don't be offended, I noticed you only have 4 posts here, and its a simple thing if its just the stock whistle,
Does the 3fe suffer from this "stock whistle"
 
Joined
Feb 28, 2012
Messages
996
Location
N. Phx
I've never owned a 3FE, but it's still a straight 6 with the same header-collector design as any other 80-series. Can anyone confirm?
 
Joined
Oct 13, 2020
Messages
5
Location
Michigan
Is it a whine or is it a whistle? If its more like a whistle and only under 1/2-2/3 throttle at that speed, it's the exhaust collector doing the classic "80 whistle".

Don't be offended, I noticed you only have 4 posts here, and its a simple thing if its just the stock whistle,
No offense taken, I am always open to learning. Unfortunately my mechanic got COVID, I was intending to get a video recording of the sound but it's sitting in his shop till he's better. In terms of the exhaust, it's not a stock system, twin pipe with cat delete. I have some experience with bad bearings on a wheel, sounds similar to that whining but not quite grinding.
 

Squash

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Joined
Dec 8, 2006
Messages
1,525
Location
Sudbury, Ont. CA
Check driveline slip yokes!
Hydrolocking turns the driveshft into a straight piece of steel vs something which allows movement. If locked she makes noise and puts pressure on the rear pinion seal.
 
Joined
Jul 17, 2018
Messages
1,186
Location
KN4YJE LUGOFF, SC
For months, when I first brought mine home, I thought a faint whine I was hearing up front was actually directly behind me.... the fuel pump.
It will make a high pitched whine as the high flow circuit kicks in when accelerating.
 

Tachycardic

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Joined
Nov 2, 2019
Messages
479
Location
Nevada
Low hanging fruit, as it's been sitting:
1) top off front diff fluid.
2) top off center diff fluid.
3) grease front shaft u/js and yoke.
4) check your knuckle balls for dryness. You typically want 2/3rds of the ball to show a thin film of grease (bottom to top). Add moly into inspection port on the knuckle if necessary. I do 50 pumps of the grease gun (with zerk connector off) and re-eval.

As you describe, the noise is impacted when you're on and off the accelerator. This points to drive line components - everything from the center diff out to the knuckles.

Mine whines at certain speeds, but it's slight and not concerning in the least. I kinda like the mechanical orchestra, as it were.
Definitely do this! It didn't eliminate my truck's whine, but it did improve it by about 50%. I believe that the whine that we are experiencing is related to fuel delivery. I like Rusty Marlin's post about the fuel pump. I may change that at some point, but first, it's time to replace the fuel filter...joy.
 

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