1999 silverado

[Perandall]

any one have any diagrams of the entire air system for the engine on a 1999 silverado with the 4.8l. still trying to diagnose p1416 trouble code and need to locate valves and things?

[GM-Tech]

It's not difficult to find the components. The air pump is in the right (passenger) rear corner, right where the fender/firewall meet.

 

Follow the hose from the pump over to the pipe that feeds air, and you'll find the check valves. They're on the ends of the pipes that come out of the exhaust manifolds and they have a short section of hose that connects each valve to the main pipe that's fed by the air pump.