E 450 V8-5.4L (2009)
the source of the vibration.
NOTE: The following is a list of common vehicle concerns that have been misdiagnosed as TCC shudder. For diagnosis of the following items, refer to
the appropriate systems of the diagnostic/repair information and Computers and Control Systems Information.
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Spark plugs - check for cracks, high resistance or broken insulators
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Ignition coil-on-plug - short or open circuit
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Fuel injector - filter may be plugged
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Fuel contamination - engine driveability concerns
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EGR valve - valve may let in too much exhaust gas and cause engine to run lean
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Vacuum leak - engine will not get correct air/fuel mixture
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Manifold Absolute Pressure (MAP) and Mass Air Flow (MAF) sensor - incorrect air/fuel mixture
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Heated Oxygen Sensor (HO2S) - too rich/lean air/fuel mixture
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Fuel pressure - may be too low
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Engine mounts - loose/damaged mounts can cause vibration concerns
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Axle joints - check for vibration
Torque Converter Road Evaluation Form