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Home >> Ford >> 1981 >> Econoline E150, Van Display Extended, 4.9L Eng VIN E, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MCU Engine Control System >> Diagnosis & Testing >> Non-Code Tests >> Spark Retard Solenoid Check

Spark Retard Solenoid Check

Remove vacuum gauge from canister purge hose and reconnect hose. Remove filter from spark retard solenoid and connect vacuum gauge to port. Turn engine off, then restart it and increase RPM to initiate Self-Test. If gauge pulses 3 times, system and MCU are O.K. If vacuum remains high or low, go to test  13, Spark Retard Solenoid test.

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