2012 international prostar maxxforce 13 air leak

soap ans water ando check for bubbles

 

It is normal to have some air leaking, as there is an air pressure regulator in the air control valve near the turbos. The wastegate and exhaust back pressure valve are air pressure controlled by this valve. If the leak goes away with the key off, it is probably just air out the regulator you are hearing.

 

Ok, no, that is different. The amount the valve leaks is very very little and you would never be able to notice any pressure loss. I recommend someone who knows Maxxforces to have a look at this.

 

I have this same problem on two of my maxxforces. I have replaced the ACV on both of them once already because they where originally leaking and never had them leak before. Now with a new ACV on both truck they still leak with key on, not only is the air leak audible which makes it technically not DOT compliant but its draining the primary air tank not the secondary air tank. the leaks are coming of the exhaust ports on it, which there are two. I have been inside and looking at i thought maybe i should do a pin out to check if there was a small amount of voltage from the ECM holding the valve open but no such luck. I have no idea why it leaks but there is no way that it is DOT compliant in my mind. I guess if its designed that way it is ok??

 

It is definitely designed that way and will leak a very small amount with key on.

 

Anybody ever fully resolve this issue to their satisfaction?

 

If it leaks only with the key on, that is normal. What are you experiencing?