whistling noise from engine compantment
Thread Starter
Instructor
Joined: Aug 2004
Posts: 139
Likes: 0
From: statesboro ga
whistling noise from engine compantment
ever since I bought the 98 its had a whistling noise at acceleration in the engine compartment. I always hear it at 1800-2000 rpms and it goes away when the gear changes and the rmps go down but comes back when the motor is under torque...I have noticed that it sounds like its sucking air causing the whistling noise sort of like a turbo. I cant find the source...Its not the trans because it will do it in park... and I sprayed around the maifold to check for leaks with cleaner and no change in idle. The mods are a vortex air box, halltech bridge and a fast intake. any suggestions would be great....
Racer
Joined: Feb 2005
Posts: 270
Likes: 8
From: O'Fallon Illinois
I had this problem on my 2003 Tahoe and I have it to a lesser degree on my 2001 Vette now. On the Tahoe it was the intake manifold. It is a different gasket setup than the Vette though. The Vette intake is sensitive to the torque on the intake maniford bolts...they don't take very much. It is common to over torque them. I think I did that when I changed out my oil pressure sensor on the 01.
If it really bothers you, I would try replacing the intake o-ring type gaskets. It's not that hard. And don't over-torque them!
Just mu $0.02.
Rick
If it really bothers you, I would try replacing the intake o-ring type gaskets. It's not that hard. And don't over-torque them!
Just mu $0.02.
Rick
Pro
Joined: Aug 2004
Posts: 651
Likes: 1
From: Janesville WI
I know exactly the noise you're talking about. I intalled a vortex air box when I first got the car. Shortly after I noticed the high pitched whistle at maybe 10% throttle and at about 1900-2000 rpms. I never did find it, but assumed it was the air box. I drove for 2 years like that until I had a supercharger (with different air box) installed. It never hurt anything. My guess is the noise comes from right where the vortex narrows. Probably a hard plastic edge in there somewhere. I just didn't want to take the vortex off again.
Ada
Ada
Racer
Joined: Apr 2008
Posts: 319
Likes: 7
From: Rochester NY
Funny, I posted this same question a few weeks ago. I have a 2000 with the Vortex ramair box and I get the same whistling noise at acceleration in the engine compartment. I also get it from 1800-2000 rpms and when I push it hard, and then when the gears change it goes away pretty quickly. What I found out is that it is the ramair system, when it suck up air that's just the sound you get when you're accelerating hard the system really works hard to pull air in at 30-40 MPH and then again sometime at 50-60.
