[Que pasa t]

I'm replacing my valve cover and have open access to my EGR Combo Valve.

After I removed the hose to the EGR Combo Valve, by just looking at it I can see a build up of rust and dirt at the inlet port. But I'm not getting any codes. I'd like to replace it since I have access.

And also because I picked up a used combo valve from the junk yard for practically nothing, because it looked really good, almost new like it had been replaced before the car went to the scrap yard.

Anyways, is there a way to test the valve to check if it's good. I'd hate to install it to later find its stuck closed.

Your help, advice and suggestions are needed and appreciated.

Thanks.

 

[AndreasPassat]

Are you referring to this?

The best way is to use a vacuum pump. $20 - $50 price range.

Apply vacuum to to the Kombi valve. The valve should open and continue to hold vacuum.
When releasing the vacuum the valve should close.
If it doesn't hold vacuum then diaphragm is no good which in turn will make the Kombi valve useless.

 

[cchief22]

The metal pipe that comes from the SAIP pump ,runs along VC, and attaches to the combi with the rubber hose is more than likely clogged. You need to clean that as well. The combi should no allow any air to pass thru it unless when vacuum is applied at the actuation nipple/port.

 

[cchief22]

It is also a common problem to have the vacuum applied at the actuation to hold a vacuum (diaphragm good) but valve itself is stuck partially open with crap not allowing it to seal.