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  1. Disconnect Green-striped hose from injection mixer and connect vacuum pump to hose end. When engine is cold, 140°F (60°C) or less, and at idle, apply vacuum to hose. If idle does not change and vacuum leaks from EGR control solenoid valve, system is okay.
  2. When engine is hot, 185-205°F (85-95°C), and at idle, apply 2.4 in. Hg of vacuum. If idle does not change and vacuum holds, system is okay.
  3. Apply 6.8 in. Hg of vacuum. If idle becomes unstable or engine stalls (and vacuum holds), system is okay.
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