Whistling Noise around 4000 rpm [Archive] - GrandAmGT.com Forum

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murph2003
08-09-2004, 03:39 PM
For about 2 weeks now when im accelerating my engine makes a high pitched whistling noise from about 4000 rpms till it shifts. A friend of mine told me a whistling sound means a vacuum leak but i checked all the vacuum lines that i see and they are all fine...So far i havnt noticed a performance difference besides my 15 mpg that i get but thats been like that since i bought the car...any ideas?

Gold99HO
08-09-2004, 06:29 PM
mine makes the same noise, its just the Air box sucking air

Hexx
08-09-2004, 06:46 PM
15mpg....that sucks. How hard do you drive your car? City or highway?

murph2003
08-09-2004, 10:04 PM
Pretty much 50/50 on city/highway driving and no im not hard on the gas either...I dont know if the previous owner changed the computer or what but its pretty hard on my wallet...

xxbackhillxx
08-09-2004, 10:07 PM
and no im not hard on the gas either
if youre not hard on the gas what are you doing at 4000 rpm?

murph2003
08-10-2004, 07:21 AM
What i meant is that every time i take off im not flooring it. Even at half or so throttle it still doesnt shift till about 4000

Alkaholik
08-10-2004, 09:33 AM
maybe you have a supercharger

GAGTSCTGuy
08-10-2004, 09:36 AM
Mine whisstles when I'm hard on the gas but let off at about 4k, I thought it was from the CAI. If I stay on the gas it doesn't do it.

15MPG is pretty bad :thumbsdow

Hexx
08-10-2004, 11:48 AM
I find driving at 4K RPM "hard" with our cars. I try and keep the needle under 3K but during takeoff it goes to 3K-3.5K rpm.

How is your belt and air filter? It sounds like it might be a filter thing. Are there any holes cut into the airbox?

Mine whistles with my CAI all the time (not that loud but you can hear it).

I dont know what else it could be.

kse73
08-10-2004, 12:14 PM
Ive always driven my car exceptionally hard. But still never experienced any whistling before my cold air intake. I would check all of the couplers leading to your MAF and TB. Make sure everything is tight and whatnot. Even if there was something loose, I dont think that would account for that poor of gas mileage.

carsarecool
08-10-2004, 08:36 PM
i know what ya mean, mine doesnt do that but my buddys 3100 malibu makes a whine/whistling noise around 3.5-4k rpm's, its kinda cool. he DOES drive it hard but he got it w/ 84k miles and has 97 or so, no problems or anything yet and it drives pretty hard for a 3100 so theres no performance loss

preed4962
08-11-2004, 07:49 PM
Could be the fuel pressure regulator....

dynamic9812
12-27-2005, 12:39 PM
I have this same high pitched noise, but mine starts at 2600rpm. It makes the noise when I'm in neutral and when I am driving. It sounds like its coming from just under the intake manifold. I checked the accessories and replaced the tension pulley, so I'm pretty sure its not coming from the belt. Has anyone figured out what it is?

atc3434
12-27-2005, 02:12 PM
I had a alternator that sounded just like a S/C on my old Buick Century. Can you pinpoint the noise by holding the the throttle open some while looking under the hood? My CAI always whistled, but the stock airbox has never made any noise.

2002AmSE
12-27-2005, 02:20 PM
Ever since I changed to a cogged belt(gatorback) the thing has sounded like there is a super in there. I know other people have got the noise and supposedly it's normally short lived, but perhaps yours went away and came back if you have a cogged belt... What kind of belt do you have?

videoman
12-27-2005, 07:08 PM
If you are getting such poor mileage I would also consider changing the O2 Sensor and checking the PCV. A friend of mine had his PCV come off and he had a mild whistle sound.

dynamic9812
12-29-2005, 07:39 AM
I had my brother take it to pep boys while I was at work yesterday and they said I have a leak in the exhaust system. I didn't review the paperwork yet, but from what it sounds like when the air started flowing over the leak/crack it would whistle. It makes sense because the higher the rpms the louder the noise.