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1990
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Bronco II 4WD, Standard, M5OD-R1
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Repair and Diagnosis (Single Page)
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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 85
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Code 85
If Code 42 also displayed, service it first.
Excessive fuel pressure, check regulator vacuum line and fuel supply line.
Excessive fuel flow, check for damaged injector pintles or injector stuck open.