1989 Ford Probe GL, StandardFACTORY OEM SERVICE PROCEDURE

Testing Dual Orifice Valves

  1. 1.9L engine is equipped with a Dual Orifice PCV system. Periodic inspection is required. Check for proper hose routing and/or blocked, cracked or broken hoses. Clean as required.
  2. Place transmission in Park or Neutral set parking brake, block wheels. Turn A/C to "OFF". Bring engine to operating temperature.
  3. Remove vacuum control hose at throttle body port. Apply manifold vacuum to port. If there is significant change in engine RPM, go on to step 2). If not replace dual orifice assembly.
  4. Remove crankcase vent connector from side of air cleaner. Hold a stiff piece of paper over open end of vent connector for one minute. If vacuum holds paper in place PCV system is good. If not go on to step 5).
  5. Remove vacuum hose (small) at crankcase vent connector. Place stiff paper over vacuum hose. If vacuum holds paper, replace crankcase vent connector. If not go to step 6).
  6. Remove dual orifice valve and check that valve is clear. If not, clear or replace as necessary.
Fig 1: Dual Orifice PCV (1.9L)
G106127Courtesy of FORD MOTOR CO.
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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.