FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM
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Car repair manuals for everyone.
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Buick
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1990
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LeSabre Estate Wagon V8-307 5.0L VIN Y 4-bbl
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Ignition Control Module
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Description and Operation
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Distributor Reference Signal
Distributor Reference Signal
Ignition Module:
The "B" terminal on the 7 pin ignition module provides reference pulses to the ECM indicating engine rpm and crankshaft position.