EGR Function Testing - Isuzu: Other Isuzu Trooper II

Amigo, I-Mark, Pickup, Rodeo & Trooper

1. Check vacuum lines for correct routing. Disconnect vacuum hose at EGR valve, and plug hose end. Connect vacuum pump to EGR valve. Start engine. Apply 4.7 in. Hg to EGR valve and hold.
2. Engine speed should drop at least 100 RPM or engine should stall. Vacuum should not drop greater than one in. Hg in 30 seconds. Reconnect EGR vacuum hose. With engine warm, increase engine speed. Ensure EGR valve stem moves up.

Backpressure Transducer

Remove hose from exhaust fitting at backpressure transducer. Blow into fitting and ensure transducer holds pressure.

Impulse, Stylus & Trooper II With Gasoline Engine

1. Check vacuum lines for correct routing. Disconnect vacuum hose at EGR valve, and plug hose end. Connect vacuum pump to EGR valve. Start engine. Apply 6-10 in. Hg to valve and hold.
2. Engine speed should drop at least 100 RPM or engine should stall. Vacuum should not drop greater than one in. Hg in 30 seconds. Reconnect EGR vacuum hose. With engine warm, increase engine speed. Ensure EGR valve stem moves up.

Disconnect all vacuum and exhaust pipe hoses. Blow into Black hose. Apply vacuum to fitting from ported vacuum source. Vacuum should pass to other side until pressure at bottom fitting is released.