2K2 LS1

iTrader: (2)

What could it possibly be? I thought maybe a vacum leak but it is only at start up in colded weather and under 2k rpms, and only seems to be when the motor is under load? BTW the weather is in the upper 20's and 30's. Any ideas?

hodiec

is your air lid closed snuggly?

2K2 LS1

iTrader: (2)

Mmmm I did actualy have it off recently. I will check.

Ragtop 99

iTrader: (7)

Does it go away when the motor warms up?

2K2 LS1

iTrader: (2)

yes

Y2K_WS6_T/A

notice if any belts are squeeking?

2K2 LS1

iTrader: (2)

Checked belts are fine. Only things that could whistle might be the intake lid, ported maf, or prted tb, or the cuppling. Although psj mentioned the airm pump. Anyone had this problem?

Y2K_WS6_T/A

although i didn't have a distinct whistling sound, i found out that i had an exhaust (header) leak, which was fixed and the noise has since subsided. you didn't install the headers yet did you?

2K2 LS1

iTrader: (2)

[quote]Originally posted by Y2K_WS6_T/A:
<strong>although i didn't have a distinct whistling sound, i found out that i had an exhaust (header) leak, which was fixed and the noise has since subsided. you didn't install the headers yet did you?</strong><hr></blockquote>

Nope they are at the shop still. Maybe this weekend.
<img src="graemlins/fluffy.gif" border="0" alt="[Fluffy]" />

WhiteRhino

iTrader: (6)

More than likely its your air pump.It should run for a couple of minutes till the car warms up.Then it shuts off.

Z2802

I have a 2002 Z28, it whistles also when it's cold, after a minute or two it stops. I don't think it's a problem, it started when I got my air lid. Sounds like the air pump or something, also once the whistling stops there seems to be noticably more steam coming out of the exhaust, thats just an observation.

2K2 LS1

iTrader: (2)

Well that thing is loud. It sounded like a cop siren. <img src="gr_stretch.gif" border="0"> <img src="graemlins/gr_guns.gif" border="0" alt="[guns]" />

2000Firehawk

iTrader: (248)

Don't know if this might be the answer, but there was a whistling problem with the LS6 intake, which is now on the f-body cars. Maybe it is the reason that GM stopped production on the intake, to redesign it <img src="images/icons/confused.gif" border="0">

Dave

2K2 LS1

iTrader: (2)

[quote]Originally posted by 2000Firehawk:
<strong>Don't know if this might be the answer, but there was a whistling problem with the LS6 intake, which is now on the f-body cars. Maybe it is the reason that GM stopped production on the intake, to redesign it <img src="images/icons/confused.gif" border="0">

Dave</strong><hr></blockquote>

Nope my 01' had the LS6 intake as well; no whistling for 26k miles before I traded it in.

Dope

iTrader: (2)

I have it too. Not sure what it is. It goes away after 2k rpms because the engine/exhaust drowns it out I think. However, cruising at a steady 60mph or so (just under 2k) produces the whistling sound pretty loudly. With the cutout closed it's pretty annoying. It's always done it, but it's gotten pretty loud recently. No changes made either. I got FTRA/K&N/LID. Free EGR mod, TB bypass. I picked up a bit of a whistle initially from freeing up the intake, but this is just weird. Maybe the cold air just makes a diff noise being denser?

Dope

2K2 LS1

iTrader: (2)

Now the tb bypass has more of a chance than the colder dense air IMO.

gator's 99TA

iTrader: (2)

i would certainly think it is the air pump, especially if it goes away after about 5 min. also when you take a aftermarket lid, there is less silencers (none actually). i would not worry about it. sounds very normal.

jpolser

iTrader: (3)

I'm almost positive that it is the air pump. I had a loud *** whirring sound which sounded like it was coming from everywhere, and could not pinpoint the exact location. It also didnt do it every time I did a cold start, but 75% of the time. I put headers on the car, took the air pump out, and wallah..no more sound <img src="gr_grin.gif" border="0">

WICKED SS

iTrader: (36)

I have the same problem with my car doing that! To me it sounds like it could be th belts, I notice it more in the morning but after driving to work and the car has warmed up it still does it unless I drive it more through out the day then it kinda goes away? Could this be cause my ASP pullies?

DanZ28

iTrader: (5)

Yep, mine does it to till it gets warm and it's the air pump. Easiest way to tell is to pop your hood and put your ear near the little air filter you installed on your air pump hose when you put the new lid on. You should hear that loud sort of whistle sound coming from there.