Image Unavailable, Please Login I am hoping someone can explain this diagram. I think most of us understand the secondary air injection system but how does this system Create vacume. From what I can tell the secondary system would work first when you first start the car but after The pump shuts off is that when it starts to create vacume in the tank?
If you mean the #6 vacuum tank for the exhaust valves and secondary air valve. It gets vacuum through a vacuum port on the throttle body housing. All of the throttle bodies have it but there is a dedicated vacuum port/source on one of the rear throttle bodies. The vacuum tank will get vacuum in just a few seconds of engine running. Source vacuum is one of the rear throttle body port, it will be a port after/below the throttle plate. The flexible vacuum line connected from the throttle body is then connected to a thin vacuum metal vacuum line that is welded to the secondary air pipe #36. From that thin metal vacuum line connects another flexible vacuum line to the vacuum tank #6. Flexible line from the tank and splits to both solenoids #8. Computer controlled solenoids then goes to the secondary air valve #13 and one goes to the exhaust bypass valve. vacuum is generated in seconds when the engine is first started, if the system has no leaks. The vacuum system for the F355 is considered the control side of the secondary air system and the exhaust bypass valve. When the secondary air pump is on, the vacuum/controls responsibility is just to open valve #13 to let the air pump air through the exhaust.
