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Home >> Pontiac >> 1990 >> Grand Prix SE, 3.1 T, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Basic Testing >> Basic Ignition System Checks >> HEI-Est Distributor >> Notes
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HEI-Est Distributor: Notes

NOTE: The only adjustments that can be made to HEI/EST ignition system are basic ignition timing and spark plug gap.
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