My chevy impala is making a ticking noise under the hood. 1st thing in the morning does not happen. After I drive it for two miles or so I hear a ticking noise from under the hood. When the rpms go up noise goes away however as soon as I slow down to a stop the ticking noice comes back louder . Any thoughts ?

SOURCE: noise in transfer case or front differential

i had the same problem.. it is the vacuum switch on the transfer case. the switch is stuck open and supplying vacuum to the vacuum diaphram under the battery box. the switch is located on the upper side of the transfer case ( not the front differential) which is located driver side of the transmission. the switch cost me about $25.00. I replaced it myself. if you do your own mechanical work you can get it done just be patient.

SOURCE: change alternator on 2003 chevy impala

here is a trick. While it is running, use a yardstick or wooden broom hande, and place it on the casting of the alternator or object you suspect is growling. You can hear the bad bearing amplified through the wood if you put your ear to it. It is a great way to pin point bad bearing noise

SOURCE: There is a loud noise at 45mph.

Find a quiet empty stretch of road. Go 50 mph, put the trans in NEUTRAL and shut the engine. If noise is still there, swing car left and right to detect noise differences. Could be hub or axle bearings. Not engine or trans if noise is still there. Hope this helps

SOURCE: Ticking on '05 Chevy Equinox

THE TICKING NOISE IS VALVE LIFTERS.MOST OF THE TIME WHEN ENGINE OIL GETS DIRTY NEEDS OIL CHANGE.DIRT GETS IN LIFTERS THEN CAUSES THEM TO BE NOISEY.IF LIFTERS STAY NOISEY ALL THE TIME.THEY OR WORN AND NEED REPLACING.ITS NORMAL FOR CAR TO SMOKE A LITTLE WHITE SMOKE IN MORNING ON START UP.LONG AS IT DONT KEEP SMOKING IF SO.YOU HAVE HEAD GASKET LEAKING.

SOURCE: high squeal noise coming from rt front end. only

it's the hanger bearing between the 2 driveshafts midway down the vehical had the same problem