B Series Truck L4-2000 1998cc (1986)
Air Injection Control Valve: Testing and Inspection
1.
Run engine until normal operating temperature is reached, then turn engine off.
2.
Remove air filter cover and air filter.
3.
Start engine and run at idle.
4.
Place a thin piece of paper over No. 1 air control valve inlet port and ensure secondary is drawn in.
5.
Disconnect and plug No. 1 air control valve vacuum line and ensure secondary air is not drawn in.
6.
Place a thin piece of paper over No. 2 air control valve inlet port. Ensure secondary air is not drawn in until engine speed is increased above 1400
RPM or the idle switch closes.
