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1994 Toyota Pickup whirring noise appearing to be coming fr

Tiny
RUSTYBOY
  • MEMBER
  • 1994 TOYOTA PICKUP
  • 6 CYL
  • 4WD
  • MANUAL
  • 164,000 MILES
While driving in all gears there is this noise seeming in all gears and is more pronounced when under accelerating/pulling and in decelerating. One can quiet the noise between accelerating and decelerating. You may have answered this type of question, but I could not find one. First thought is wheel bearing, axle bearing or rear end (differential). Is there a diagnostic method to pin point the noise w/o tear down?

thanks
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Monday, October 25th, 2010 AT 9:17 PM

4 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
A chassis ear that can be randomly placed throughout the vehicle while it is driven can isolate the noise. If it can be reproduced with the wheels of the ground and run up, you may be able to locate it as well. The fact that it is present on accel and decel suggests possibly a differential type noise, pinion bearing or side bearing. If this is a manual transmission, it could be within that as well. Does the vehicle have a canopy, and sliding windows? Sometimes when it is driven with the window open, the sound can be amplified from the rear and determined. Draining fluids and inspecting may also give an indication.
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Monday, October 25th, 2010 AT 9:47 PM
Tiny
RUSTYBOY
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  • 3 POSTS
Gstacey,

A chassis ear. What is that? Am taking truck to dealer for diagnosis Thurs & wanted to get a handle on possible problems and resoultions.
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Monday, October 25th, 2010 AT 10:30 PM
Tiny
RUSTYBOY
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  • 3 POSTS
Gstacy,

what is a "chassis ear". Presume something like a stethoscope? Will try driving with the rear slider open to see is that enhances to sound. Thanks, rustyboy
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Tuesday, October 26th, 2010 AT 10:14 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Chassis ear is a device made by a company named steelman. It has sensors that can be mounted throughout the vehicle that report to a central switchbox, and through the use of headphones you can switch to each sensor and listen to the noises.
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Tuesday, October 26th, 2010 AT 5:47 PM

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