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System Testing (Federal)

  1. Disconnect Green-striped hose from throttle body and connect vacuum pump to hose end. Plug nipple where hose was connected to throttle body. When engine is cold, 122°F (50°C) or less and at idle, apply vacuum to disconnected hose. If idle does no change and vacuum bleeds down, system is okay.
  2. When engine is hot, 205°F (95°C), and at idle, apply 1.8 in. Hg vacuum. If idle does not change and vacuum holds, system is okay.
  3. Using a vacuum pump, apply 7.7 in. Hg vacuum. If idle becomes unstable or engine stalls (and vacuum holds), system is okay.
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