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Home >> Pontiac >> 1979 >> Phoenix Base, 2D Hatchback, 3.8L Eng VIN A, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computer Controlled Catalytic Converter >> Testing & Diagnosis >> Distributor Advance/Retard System Tests (1979 3.8L Engine) >> Functional Test

Functional Test

  1. To check proper operation, connect timing light and check timing at normal operating temperature. Adjust if necessary. See appropriate article in TUNE-UP PROCEDURES section.
  2. Detach connector from temperature switch at water outlet housing. Engine timing should remain at specification.
  3. Ground temperature switch connector. Timing should decrease by about 6 degrees. If not, check hoses and wiring for proper condition and connections. If hoses and wiring are okay, test solenoids, relay and distributor dual diaphragm vacuum advance unit.
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