When the engine is cold and I start the car I get a noise like a jet engine. Metal rubbing against metal. This lasts for about 45 seconds then stops. GM dealer replaced the air pump and fixed problem. Is this a common problem with a 2001 DeVille? Vehicle only has 8000 miles. Doesn't seem like that should fail at that mileage.
AIR PUMP NOISE WHEN STARTING ENGINE on 2001 Cadillac DeVille
by Navyrocket in Fort Myers, FL on May 19, 2010
ANSWER by Bret Bodas , May 19, 2010
Sometimes the age plays a part too, especially with a part like this. This pump will operate only when the engine is started cold (for a minute or so), and the amount you drive after that is irrelevant. So with this part, it may actually be worse to take a lot of short drives, which is often the case with low mileage vehicles. I've seen many of these pumps fail, and I would make sure that the air pump check valve is OK. This valve prevents exhaust gases from getting to the pump and damaging it, so I would ask the shop if they checked that part for proper operation.
ANSWER by 773mtech , May 19, 2010
common problem with these cars but usually fail due to water damage because of a missing splash sheild driverside front of car