Squeal at back of engine (vacuum?) VIDEO INCLUDED

[aperseghin]

ok here is the squeal and where i think it is

click pick for video

 

also anyone know what those 2 connectors go to? the ones that are not connected to anything

[ComancheKid45]

Definently sounds like a vaccum leak.

 

1 of those plugs should goto the Coolant sensor and the other I'm unsure, ill take a look later if no one chimes in.

[aperseghin]

That makes snse, I have an aftermarket coolant temp sensor installed, as for the vacuum line, where is it? Where should I be looking, is it a major issue or what?

 

-Posted from my blackberry

[carnuck]

Sounds like a crack in the MAP sensor hose (mine made horrible noises and ate double the gas it should have.) Other possibility is CPS may be set too low or intake gasket sucking air and making the gasket act like a reed valve

[aperseghin]

i don't understand any of that.. can you give me more detail?

[carnuck]

There is a plastic line that goes from the intake to the MAP sensor (on the firewall above the motor) that can crack. (I'm doing this on a phone from Canada so pics aren't easy to link. Search for MAP sensor if you don't know what that is)

If the bolts holding the manifold to the head are loose, the gasket that is supposed to seal between them will allow air past it and the noise will come from the gasket vibrating (like the reed valve in a saxophone)

If the crank position sensor is set too far down, it will touch the flywheel.

 

Try taking a can of sensor safe cleaner ( for Throttlebody) and spray it around that area a bit at a time (not when the motor is very hot though!) and listen for any changes in the motor running or the sound. That's how you find vacuum leaks.

 

Oh! There is also a valve in the cap of the throttle body that can make noise when it gets gummed up. You'll feel the vibes with your fingers (just avoid really hot areas!)

[aperseghin]

resolved.. valve cover gasket