03 Cobra Whistle problem...HELP!

[SmoknCobra03]

I have an 03 Cobra...had the motor rebuilt with all new internals bout a yr ago. Recently its started making a high pitch whistle noise once the car gets up to temp. Ive checked all the pullies and no luck also have good vac so this noise has me puzzled. It starts once the car gets up to temp at idle and while cruising at a steady speed. Once it starts while cruising if u give it a little throttle it goes away then comes back once I start goin steady. It also does it when i come to a stop at idle accept when i rev the car it keeps goin. Once the car is turned off it keeps going for a good 10-15 secs once the car is off which is what has me stumped... Any suggestions? thanks in advance :bowdown:

 

[Jefe]

Gonna have to pin point it. Any video of it? Ummm hellraiser? Why have you been holding out on us? :rolling: How is it? How much boost?

 

[2003_svtcobra]

it could be your fan.

 

[Digital]

I have an 03 Cobra...had the motor rebuilt with all new internals bout a yr ago. Recently its started making a high pitch whistle noise once the car gets up to temp. Ive checked all the pullies and no luck also have good vac so this noise has me puzzled. It starts once the car gets up to temp at idle and while cruising at a steady speed. Once it starts while cruising if u give it a little throttle it goes away then comes back once I start goin steady. It also does it when i come to a stop at idle accept when i rev the car it keeps goin. Once the car is turned off it keeps going for a good 10-15 secs once the car is off which is what has me stumped... Any suggestions? thanks in advance :bowdown:

For the life of me I forget the name of this part. But check it. I had a similar issue on the dyno when it got bumped some how.

 

[SmoknCobra03]

its comin from the front of the motor right around the water pump...its not the pump tho...im wonderin if it could b the line that comes out of the bottom of the lower intake and runs through the valley...it deff sounds like a vac leak but i have no idea what else is up there

 

[SmoknCobra03]

ill try to get a vid uploaded today...

 

[Jefe]

Do you have an aftermarket boost/vacuum gauge? that would tell you its a leak somewhere

 

[SmoknCobra03]

yah according to the gauge i have good vac...20lbs

 

[Jefe]

AC on? Vac should be at 21-22 with AC off, unless your gauge doesnt sit right at 0 with the key turned to Acc

 

[SmoknCobra03]

well it used 2 b 21-22 with the old motor...but now the compression is 7.9 so idk if that has anything to do with it er not.

 

[346CamaroSS]

does it sound like "Woo woo"?
http://i.t.com.com/i/lumiere/2005/07/21/1138-1138-20050721_125751-320x240.jpg

 

[Jimmysidecarr]

High boost will pop vacuum lines off of cars that normally never have that issue.

Check every single vacuum connection and line from start to finish. Hard lines can rub through or split.

An unlit propane torch is a great way to locate difficult to find vacuum leaks. The idle will raise up when the nozzle gets close to the leak.

The whistle after shut down for a few seconds is a dead give away that it is a vacuum leak.