Mister Hand

iTrader: (1)

I have a 2002 Z28 MT with about 35k miles. Recently it has developed a strange high-pitched whine that happens when I start the car cold.

It whines consistently for about two minutes and then stops and doesn't happen again until the next cold start. It seems to be coming from the area around the driver's side of the engine up nearer to the firewall than the front bumper, but it doesn't seem to be coming from the engine itself. It is almost like some kind of compressor or pump noise, but I really have no idea.

Can anyone help? It is annoying and I would like to fix it.

2001NBMZ28

I'm thinking it's the AIR pump, under the drivers side headlight area - or maybe just a loose air hose if it's coming from somewhere else. To verify if it's the AIR system you can pull the AIR PUMP fuse under the hood while it's making the noise and see if it stops. It might throw an SES light for P0412 but turn itself back off after replacing the fuse and a few cycles. If it's the pump itself and abnoxiously loud you'll probably need to replace it, or disable the secondary air system.

xXSilencerXx

iTrader: (4)

Mine is loud. But since it turned off after awhile I assumed nothing was wrong.

transamws6_97

iTrader: (5)

Yeah since the only time the air system is at work is when your car is cold and it goes to heat up the cats so it definitely sounds like your AIR system

Omec

iTrader: (2)

def sounds like the air pump. mine makes noise every now and again and my girl friends is well, its seen better days lol.

2_wacko

iTrader: (2)

By anychance have you painted your pulleys or installed a new pulley.

transamws6_97

iTrader: (5)

what does that have to do with it? If it was a pulley then it would always do it not just at startup

2001 White Ws6

iTrader: (1)

I have something similar but I have removed my AIR system so that is not it on mine.

Jglisson

iTrader: (1)

The EGR makes a whine as well when it is going.

2001NBMZ28

'01 and '02 don't have EGR....

MrEddie

Mine would do it in the summer during startup and would then quit - I could hear it cuttoff with the hood up and no more squeal. It stopped doing it after the first 2 years of owning the car though.