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Home >> Buick >> 1987 >> Somerset Custom, 3.0 L >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - Direct Ignition System (Dis) >> Operation >> Reference Ground
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Reference Ground

The EST system is grounded through the DIS ignition module to ensure that ground circuit does not have an excessive voltage drop between ignition module and the ECM. An excessive voltage drop in system could affect engine performance.

Fig 1: 2.0L Direct Ignition System (DIS) Components
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