Hi, My 2004 c230 1.8 kompressor sedan sets a code p0410 when I try to clear the monitors by performing the drive cycle. I replaced the vacuum switching valve and the vacuum hoses. The air injection valve is working; it opens and stays open when bench tested with a hand vacuum pump. Changed both O2 sensors. I even pulled the exhaust manifold and blew compressed air into the air injection port and could feel air escaping through the exhaust ports though it doesn't seem like a lot. I feel a good amount of air coming from the supercharger to the injection valve for a short time when cold starting but I don't know how strong it should be. I'm a bit stuck right now and could use some advice/ suggestions/ expertise. Thanks RH

Comments

Hi! 

There is a check valve between air injection valve and exhaust. It can get stuck. Try blowing into the hose after the air injection valve. It should be easy. If it is not, check valve is stuck. 

Boki

Hi, thanks for getting back to me. The check valve in this case is a reed valve that is in good shape. The tube from the injection valve/ check valve to the exhaust is also clear. The passages in the head that lead to the exhaust ports are really small and not accessible, but I do get a bit of air from each exhaust port when I use compressed air.

I hooked up a vacuum gauge between the switching valve and injection valve and can see there is vacuum actuation for a short time after cold start. I don't know how long the actuation should be. Where would I find info on details like that? I thought about getting a Haynes manual but it seems unlikely to have that level of detail.  Thanks again RH  

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