I've ran across a thread before that was about this same problem but i had no luck searching. not sure what this part is call but it's located on the driver side of the throttle body cover. looks like it has 2 vacuum lines going into it. after the truck runs if i turn it off there is a somewhat hissing noise coming from that part? is this a problem? if so what is the solution.thanks

 

here is the part i am talking about

 

No problems - It's working as it should. Some just get noisy after awhile.

The "noise" proves it's working. You can clean the filter under the solenoid cap if you like , but don't expect the noise to stop.

It's alright

 

could you tell me the name of the part just for my own knowledge?

 

my truck has made the noise that you describe since the day i bought it almost two years ago. nothing bad has happened yet........

im interested if this is bad also.

 

It's called the - Electronic Vacuum Regulator (EVR)

However, Ford calls it - EGR Vacuum Regulator

 

thanks, jbrew

 

No Problem -

The EVR regulates the vacuum to the EGR valve and is controlled by a pulse-width signal to open and close the EGR valve. As the duty cycle pulse width signal increases, the EVR increases the vacuum to the EGR which opens further and admits more gas into the inlet system.

{{{Vacuum not directed to the EGR valve is vented to atmosphere}}}. Even at zero duty cycle (no voltage) some vacuum will still pass the EVR, but this is not enough to overcome the spring pressure. It is not until the EVR is at 40% duty cycle that the vacuum is enough to overcome the EGR spring pressure.


That's what your hearing - ie, in bold

 

Did you ever try opening the throttle after you shut the engine off. My truck makes noise to. If I punch the throttle after the engine is off, the noise stops instantly.