Secondary Air Injection Check Valve 3.2

I doing some routine inspection and I decided to reorient the hose clamp on the easily accesssible air injection check valve. I ended up removing the hose to inspect the valve, even thought I had replaced both the original check valves at about 40,000km. But lo and behold only 20,oookm later they had indeed started to rot and fail. Not completely but enough that some exhaust was passing through. The corrosion on the item is also obvious, but only when you remove the hose to inspect. Just confirms these items should be viewed as routine replacement items, I mention this as others with the 3.2 probably have valves that are failing too, it is easy to overlook as they rot from the inside out, they always look fine on the outside.

The Standard brand pn AV7 is the readily available replacement, on they went, the one towards the front of the car requiring a bit of work to access and replace. Used ceramic anit sieze to ensure that future replacement is in fact "routine".

I also had an old spare of the disc like check valve that I replaced as why not, who am I saving it for, and inspected all the hoses, so now the air injection system is all in top shape as it should be.

The car did not run better one way or the other, so I suppose the plastic disc like check valve that the hoses from the air valves attach to must prevent back washing exhaust right into the air intake (I presume that is what the plastic disc like valve is for?). Just want to understand how the system was designed.




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Great explanation, is it the main computer that is using a specific sensor to detect cold verses warm running? Amazing that all these emmissions systems still work as well as originally intended 30 years later.