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Home >> Geo >> 1989 >> Metro L3-61 1.0L >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Ignition Timing >> Adjustments >> Timing Measurement Parameters
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Timing Measurement Parameters


Set timing at slow idle and Before Top Dead Center, unless otherwise specified. 1.0L 2V, 1.5L leave all distributor hoses connected.
1989-90, 1.0L TBI ex. LSI: Jumper terminals "C" and "D" of diagnostic connector by ignition coil.
1.6L Nova, Prizm FI: Jumper terminals "T" and "E1" of diagnostic connector underhood.
All others: Disconnect and plug distributor vacuum hoses. 1.0L LSI, when vacuum hose is connected timing will increase to check specification.




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