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Ford
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1990
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F 150 2WD Pickup L6-300 4.9L
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Repair and Diagnosis
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Maintenance
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Tune-up and Engine Performance Checks
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Ignition Timing
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Testing and Inspection
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Computed Timing Check
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With Analog Volt Meter
With Analog Volt Meter
The computed
ignition timing
check is performed in the same manner as with the STAR tester, except that the self-test sequence is activated by connecting the jumper wire between the two electrical connectors.