Car whistles!
 

When I put a certain amount of pressure on my accelerator during lower gears my car whistles, it has me baffled because it only happens when I'm going less than 45ish MPH. Anyone have any suggestions? If I hold the same pressure while it's whistling it will continue to do so, until it changes gears than I have to release some of the pressure for it to do it again. :confused:

Where does it sounds like the whistle is coming from? Engine bay, under car, outside, inside?

I have a whistle in mine..but that due to a header leak at the collector. GRRRRRRRR

Could it be your intake? Check your filter.

It's not my air filter, it sounds like it's coming from the engine though.

A vacuum leak will tend to whistle more then a exhaust leak, but the exhaust can whistle as well.

Why would it only happen at certain pressures of my foot on the accelerator and not at higher speeds..

If it's just a small crack it may only open at certain amounts. You might have to wiggle the vacuum lines a bit.

Where are they at, I've never had to mess with a vacuum line before.

:bwantpics:

See if this helps.

https://www.gmforum.com/t278867/

I don't have the L67, is it generally the same set up still?

It could be your throttle body. There was a member a while back that had the very same 'whistle' he described as you did to the T

He ended up installing a throttle body from another 3800 motor and it went away.

Yes, I do remember reading that a few months back. Wasn't it because it didn't line up right or something like that?

I should also mention I had a 2 new engines put in it for a total of 3 altogether, and it still does it...

Welcome our newest 3 Motor Club member!

Well than I would say it has to be one of your accessories your transferring over from all 3 motors. Your throttle body probably.

and your car is black to....huh

ok found the post
https://www.gmforum.com/t278613/

I know I know
3 posts in a row....

How much is a new TB? I don't really feel like paying for another repair after my side mirror...

4

https://www.gmforum.com/t278500/

It has to be the TB, because I have the new APN UIM, nothing wrong there!

you don't have to go new. hit up your local salvage yard for one and save money.

Is this a different whistle than you were talking about in the lounge thread about your car sounding like a supercharged one?

no that thread is a spoof of this one.

But the one in 'general chat' looks to be close to this one.

They're completely different, I think my L36 has a desire to be an L67!

When I get the time I'll check out what the whistle is.

It also does it when I use the Cruise control to speed up, so it has to be from a hole, there's not really any other explanation...

check for vacuum leaks around the cruise control actuator... that might be it... possibly

How would there be a hole, was it my fault? How do I prevent from happening again if it is?

Check for hose leaks or rotten hoses to the actuator motor, which is controlled by vacuum like TL said. The CC motor is connected to the TB by a cable, so follow the cable to find the CC motor. Sometimes hoses just wear out and other than replacing them all, there's not much you can do to prevent it.