FixVault
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GMC
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1990
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Forward Control 3.9 L
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/O Codes
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Symptoms (Diesel)
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Engine Will Not Shut Off With Key
Engine Will Not Shut Off With Key
ENGINE WILL NOT SHUT OFF WITH KEY
Possible Cause
Correction
Injection pump fuel solenoid doesn't return to off position
Check solenoid operation, see SYSTEM/COMP TESTS