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Home >> Chevrolet >> 1991 >> APV >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Ignition System >> Timing Control Systems >> Electronic Spark Timing (All Engines)

Electronic Spark Timing (All Engines)

An open or short to ground in the Electronic Spark Timing (EST) or by-pass circuits will cause ECM to turn on SERVICE ENGINE SOON light and confirm fault causing Code 42 is present. Refer to appropriate article below:

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