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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. If idle does not change and vacuum holds, system is okay.
  3. Using a vacuum pump, apply 6.8 in. Hg. If idle becomes unstable or engine stalls (and vacuum holds), system is okay.
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