could very possibly be a broken belt in tire.
it would depend on what kind of humming sound you are referring too. If you are over due on a transmission service or what not it will humm at higher speeds and as you slow down the humming slows with it, or if your brakes have gone bad it will make a humming sound once you hit over 30 mph. it could be a lot of things but those are some options to check out
it would most likely be the bearings but in some cases sometimes the axle make a humming noise when traveling at high speeds.(front wheel drive)
The Mitsubishi Galant is only available ina four cylinder engine. There is no option to upgrade to a higher end model with six cylinders.
For JUST an alignment $50 - $60. If parts are required, could be alot higher.
the engine the engine
YOU MIGHT CONSIDER GETTING THE WHEEL BEARINGS CHECKED, IF IT SOUNDS LIKE IT'S COMING FROM THE WHEELS (PARTICULARLY WHEN YOU ARE TURNING). THE TENSIONER WHEEL AND BOGEY WHEELS ON THE SERPENTINE BELT (FAN BELT) SOMETIMES DO THAT, TOO.
Blood coming from the lungs has lower pressure while that from the heart has higher pressure. Blood coming from the lungs also has higher oxygen content and lower carbon dioxide content compared to that coming from the heart.
Their wings beat (flap) so fast, they make a noise that sounds like humming. It's a bit like a higher note version of a bee buzzing.
Dark Horse
get a bolt on body kit, 2-12 kicker, exhaust, 18'' rims or higher, or a new whip
Ultrasonic. Or do you mean what causes them : all types of electrical machinery including TV sets, humming birds, mice (singing) insects.
The cause of your 97 Galant idling fast and then slow is a high idle system, either electrical or mechanical. Basically works like this: when the car is cold, usually in the morning, the system will cause the idle to be higher than normal to help heat the engine to normal operating temperature. Once that temperature is reached it will then kick down to a slower idle. Both idle speeds are preset by the factory. This is common on all vehicles, not just the Galant.