Car starts fine runs good but when running it has a whining noise coming from the engine somewhere that revs and slows with engine. While idle it is not bad but as you speed up or rev the enging it will get a little louder until cruise speed is achieved or at an idle. Could this be the ac unit, a belt tensioner or something of that nature? Please help.
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Re: Engine whine noise
Most likely a belt tensioner or pulley take some penetrating oil and spray the center of each pulley one at a time if the noise stops you got your bad pulley if not take the belts off the motor and spin everything by hand to feel or hear any grinding noises if you still don't feel anything run the motor (not for more then a minute) with the belts off and if the noise is still apparent your timing belt needs to be checked right away! it may be on its way out and if that goes your motor is toast good luck and please rate -jeff
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Is the engine turning over with the key in the start position? If the engine is not spinning over and you hear a whining noise, the starter is not engaging the flywheel. If the engine is turning over with the starter engaged, the engine has most likely jumped time that creates low or no compression which results in the whining noise.
Check your transmission fluid level, as recommended in the Owner's Manual. Also, if your car is equipped with power steering, check the fluid level in the power steering reserve.
If all fluids are at recommended levels, see if you can locate the noise. If it is in the engine compartment, try to determine if the noise is coming from any of the serpentine belt pulleys.
Sometimes the bearings on air injector pumps fail in higher-mileage vehicles, first causing a "whining" noise, and ultimately resulting in the serpentine belt "chirping" or squealing on acceleration. Best you can do is make sure all fluids are at recommended levels, then try to pinpoint the source of the whining noise for further diagnosis.
The basics, your battery is used to provide power to the starter. Once the engine is running the alternator then provides current to recharge the battery and run all of your electrical components. so I would suspect the starter is not working to start the engine.
the noise happens running down the road or parked? Is the car a four wheel drive? The alteanator can go bad and whine, the wheel bearings can go bad and whine, windows not fitting right can make a whine The altenator will stop whining if it's unplugged, if this fixes it the battery and the altenater need tested and a bad battery can make the altenator whine and it still be OK. Don't run the engine with the battery disconnected as this can blow alot of expensive stuff and the altenator.
Run the car from the top of a hill and let it coast at your whining speed. Put it in Neutral, does the whine disappear?
If not its in the drivetrain (wheels, driveshafts, tranny)
Very unlikely to be the timing belt. If it appears at a fixed speed then its drivetrain, if it whines at fixed revs its the engine.
Most likey the transmission I fear....Tires will also make loud whining noise too though...