Ford Focus 2003

Question Description

What would potentially cause a fairly loud vibration in a 2003 Ford Focus when the motor starts up and continues to vibrate even when warmed up?

Final Answer

The problem might be caused from a dirty/defective Idle Air Control valve.
The next time the engine's idling rough at operating temperature, locate the IAC valve on the throttle body, and tap on it with a handle of a screwdriver. If doing this causes the idle speed to change replace the IAC valve.

jkmondia (6)
University of Virginia

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