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Ford
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1990
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Bronco II RWD, Automatic
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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/Codes
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Test H - Fuel Control
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Code 86
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Code 42
Code 42
Intermittent HEGO signal (SIG or GND circuit).
Excessive fuel flow, pressure regulator vacuum supply disconnected or blocked fuel return line.
Excessive fuel flow, damaged or stuck open injector(s).