When the combi valves stick open slightly (from age / carbon build-up), warm exhaust enters the SAI System and the warm air then condenses when the engine is off, forming water in the pump and rust on metal components.
You can test the valve just like I did in the above video, by applying vacuum to the vacuum port and blowing through the valve. The valve should pass air when vacuum is applied, but no air when vacuum is off,
If you can blow through it with no vacuum applied, replace the valve.
Make sure that the gasket is not blocking the flow of air between the head & combi valve.
As long as you can hear the SAI pump run (on cold starts), the pump should be ok.
Sunday, July 27th, 2014 AT 6:09 PM