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PAIR System Test

  1. Check hoses and tubes for cracks, kinks, damage or loose connections. Ensure engine coolant temperature is less than 86°F (30°C). Disconnect No. 1 air hose from air cleaner case. See Figure.
  2. Start engine and allow to idle. Ensure bubbling sound is heard from No. 1 air hose.
  3. Operate engine until engine coolant temperature is greater than 104°F (40°C). Ensure bubbling sound is not heard from No. 1 air hose with engine idling.
  4. Increase engine speed and quickly close the throttle. Ensure bubbling noise at No. 1 air hose momentarily stops. If system does not operate correctly, check individual components.
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