Exhaust Gas Recirculation: Testing and Inspection

22R, 22R-E & 22R-TE ENGINES

1. Inspect EGR vacuum modulator filter and clean or replace as needed.
2. Connect vacuum gauge in line with EGR valve vacuum hose using suitable fitting.
3. Start engine and ensure engine runs properly at idle. If engine runs rough or stalls, check for improperly seated EGR valve.
4. With coolant temperature below 86°F, or 113°F, on 1987-88 22R engine, operate engine at 3000 RPM for 22R or 3500 RPM on 1985-88 22R-E and 22R-TE engines and observe vacuum gauge. If gauge reading is not zero, BVSV is defective.
5. Warm engine to normal operating temperature and observe gauge reading at 3000 RPM for 22R engines or 3500 RPM on 1985-88 22R-E and 22R-TE engines. Gauge should indicate low vacuum for all except 1985-88 22R Calif. models, where high vacuum should be indicated. If gauge reading is incorrect, check for defective modulator or BVSV.
6. Disconnect vacuum hose from port R of EGR vacuum modulator and apply intake manifold vacuum to the port. Vacuum gauge should indicate high vacuum at 3000 RPM on 22R engines, or 3500 RPM on 22R-E and 22R-TE engines.