Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Engine running very rough
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Old 03-06-2013, 11:36 AM   #6
FocusRus
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Dan, what is the condition of the up stream 02 sensor? This could very well be the issue if the ecm is seeing a 0v signal from the sensor, so in return the ecm thinks the engine is running lean. Do you have access to a scanner? I'd bet that your ecm is in open loop status. Lets start here and see if the 02 sensor is the problem.
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