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Home >> Plymouth >> 1980 >> Horizon Base, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Electronic Spark Control System >> Trouble Shooting >> Poor Performance Tests >> Start Advance Timing Test
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Start Advance Timing Test

  1. Connect an adjustable timing light to engine. Use a jumper wire to connect carburetor switch to a good ground. Make sure vacuum hose is connected to vacuum transducer on computer.
  2. Look at timing mark on crankshaft (located on crankshaft damper on V8 and 6 cylinder engines or on clutch housing of 4 cylinder engines). Remove plastic plug on 4 cylinder manual transmission models for access to timing marks.
  3. Start engine and adjust timing light so that crankshaft timing marks are set at basic timing. Meter on timing light should show start advance timing. Refer to Distributor Specifications in this Section. 
  4. If timing is not as specified, replace computer and retest. If timing is correct, proceed with next test.
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