LEMON Manuals
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1990
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Bronco II RWD, Standard, M5OD-R1
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Engine Performance
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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
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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).