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Air Leak Detection Test Method

WARNING: This page is about a different car, the 2015 Fiat 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the fresh air make-up hose from the oil filler neck. Cap or plug the make-up air hose nipple.
  2. Remove the PCV hose from the PCV valve. Cap or plug the PCV valve nipple.
  3. Attach an air hose with a pressure gauge and regulator to the dipstick tube.
    CAUTION:

    Do not subject the engine assembly to more than 20.6 kPa (3 PSI) of test pressure.

  4. Gradually increase air pressure from 7 kPa (1 psi) to 17 kPa (2.5 psi) maximum while applying soapy water at the suspected leak source. Adjust the regulator to a suitable test pressure within this range that provides the best bubble generation which will pinpoint the leak source. If the oil leak is detected and identified, repair per service information procedures.
  5. If the leakage occurs at the rear crankshaft oil seal area, follow the procedures for rear seal area leaks. Refer to REAR SEAL AREA LEAKS WITH AUTOMATIC TRANSMISSION .
  6. If no leaks are detected, turn off the air supply and remove the air hose and all plugs and caps. Install the PCV valve and make-up air hoses.
  7. Clean the oil off of the suspect oil leak area using a suitable solvent. Drive the vehicle at various speeds approximately 24 km (15 miles). Inspect the engine for signs of an oil leak by using a black light.
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