1979 Ford FiestaFACTORY OEM SERVICE PROCEDURE

Air Pump

  1. Remove air cleaner. Check all hoses and connections for proper condition. Check air pump belt tension and adjust as necessary.
  2. With transmission in Neutral and parking brake set, start and warm engine to normal operating temperature. Stop engine and detach hose(s) from air pump to air by-pass valve at the by-pass valve.
  3. Insert Pressure Gauge (T75L-9486-A) into end of hose disconnected from by-pass valve. Clamp pressure gauge in place. Connect tachometer and start engine.
  4. Slowly increase engine speed to 1000 RPM while observing pressure gauge. Pressure should be 2.25 psi (15.8 kg/cm2 ). If air pressure is incorrect, replace air pump and repeat test.
NOTE: If pressure gauge is not available, raise engine speed to 1500 RPM and place hand over open end of hose. Air pressure should be felt and heard.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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