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BMW
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2012
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335i 2D Convertible, Automatic Trans
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Repair and Diagnosis
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General Information
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OEM General Information
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Functional Descriptions - F25 - Cooling System, Engine Performance
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Engine Performance - Functional Description
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Detection of engine speed variations
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Engine speed variations
Engine speed variations
Fig 1: Engine Speed Variations Curve
Courtesy of BMW OF NORTH AMERICA, INC.
Y axis engine speed
Y axis actuator position feedback
x-axis time
Measured engine speed with excessive fluctuations indicating a sooted intake area.