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Ford
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1991
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Bronco 4.9 Y, Standard, M5OD-R2
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Basic Testing
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Idle Speed & Ignition Timing
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Idle Mixture Adjustment
Idle Mixture Adjustment
NOTE:
No idle mixture adjustments are possible on any models. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section for diagnosis of incorrect idle mixture.