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High pitch humming sound

My 1991 Daihatsu Hijet 4x4 Van makes a fairly loud high pitched humming sound when accelerating in 4th gear(4 speed manual). It only makes the sound when pushing on the gas in 4th gear.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: High Pitch whine during acceleration

well it could be a few things but most likely you belt is sliping. That is very common and happens to all cars over the years if the belt is not changed. You should check it out. The belt could be bad but it could also be a bad pully. If you dont know what these parts are look them up on google. its very simple

Posted on Nov 21, 2008

freetek
  • 5568 Answers

SOURCE: A high pitched whining noise in the engine.

Some questions:
- Does it happen when standing if you raise the RPMs up to 2-3,000? If yes, listen closely to the alternator.
- Is it related to road speed?  If so, then you should put it on a chassis lift, wheels free, then cause it to happen by putting it in gear and raising RPMs to road speed.
I suspect it isn't the acceleration that causes the pitch to change but rather engine RPMs.
You could check this while on the road by starting in a lower gear and noting when the whine is very noticeable, then slip into the next higher gear to see if the whine changes or remains the same. If it remains, it probably isn't related to the engine but to some rotating part(s) outside it (for example, wheel bearings.) If it changes, then the noise is coming from some engine component and alternators can do this when the amperage load is high; it's also a part that turns at a fairly high speed and will 'whine' rather than 'growl.'        

Posted on Jan 14, 2009

  • 132 Answers

SOURCE: sounds like some type of motor running (high pitched) with 4x4

it is the fuel pump this is normal

Posted on Jan 30, 2009

  • 232 Answers

SOURCE: High pitched electronic/dentist drill sound when accelerating.

Probably the front differential, your probably hearing the famous differential gear whine. Change the oil, put Lucas for gears in it. You can get a hand operated oil pump to **** it out through the dip stick if it has one. Then fill it with the recommended amount.

Posted on May 06, 2009

  • 333 Answers

SOURCE: 2004 honda odyssey making whistle noise

Could be the squeler on the brakes. Does that to let you know it's time for brake job. Have your brakes checked

Posted on Mar 28, 2010

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'91 daihatsu hijet 4x4 van 4 speed manual


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