The EGR valve is located between the air cleaner and the bank of solenoid valves
on the engine.
- Run the engine to operating temperature, then shut it off.
- Disconnect the vacuum sensing tube from the EGR valve, and connect a vacuum
pump to the valve.
- Start the engine and run it at idle. The engine should operate smoothly.
- Apply a vacuum of 15.7 in. Hg (399mm Hg) for 1980 models, or 3.9 in. Hg
(99mm Hg) for 1986–89 models to the EGR valve. The engine should stall
or experience a sharp drop in speed if the valve is working properly.
