Question about 1999 Chevrolet Silverado 1500
Yes its quite possible p[ump is going out, get the pressure for the pump checked.If the pressure is checked low then pump is the issue.Also it can be possible that transmission is causing the problem.
Accelerate the car to speeds at which the whining noise is the loudest, switch to neutral gear and kill the engine. If the noise still persists, then the problem lies somewhere in the drivetrain or transmission. If the noise goes away, then it may be the engine or clutch assembly that is causing the problem. ------
Also other possibility can be wearing out of gears in the rear differential or front, may be causing whining sounds.----------
also check condition of the drive belt and the pulleys.If pulleys are getting worn out or belt is getting loose or stretched then this noise can come.-----------
This should help.thanks.helpmech.
Posted on May 24, 2011
First take a screwdriver and place the tip of the screw driver to each accessory that runs off the serpintine belt. The handle part you will place your ear to that end. Having the engine running with the emergency brake on in park have someone raise the RPM's while you listen to each item running off the belt. You should hear a definet whine on one of these accessorys such as the power steering pump for they are prone to whinning quite a bit. Ifnone seem to be the same noise heard as you drive this truck think of the pitch it makes while you drive. With the screwdriver as a test the noise will be much lower of a pitch although in the same pattern with the RPM's as heard through the screwdriver
Posted on May 24, 2011
There is already a technical bulletin issued for the same.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:The vehicle may exhibit a whine Noise P/N, gone when in Drive when not moving.
Recommendation/Instructions:The suggested diagnosis is to shift to drive, apply brake and raise engine RPM. Noise should diminish (may not go away).
If noise is diminished or eliminated, suspect drive or driven sprocket support bearings, or gear bearing (most common is drive sprocket support bearing).
Visually Inspect Drive Sprocket Support Needle bearing for spalled needle roller.
Replace Drive Sprocket Support item #522 (includes 521/523).
Follow appropriate SI repair steps to access drive and driven sprocket supports for inspection if attached condition is found replace appropriate parts.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
Unfortunately, this is not an easy fix. I wish i could have a better news.
Let me know,if needed further assistance.
Hope i helped you.
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Posted on May 22, 2011
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Posted on Jan 02, 2017
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