Ford Focus Forum, Ford Focus ST Forum - View Single Post - Engine running very rough
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Old 03-06-2013, 02:14 PM   #7
danny42984
Focus Jr. Enthusiast
 
Join Date: Feb 2013
Fan#: 110560
Location: bristol, TN
What I Drive: 2001 maroon focus

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Quote:
Originally Posted by FocusRus View Post
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.
Thanks for the reply. I don't own a scanner but I will buy one in the next couple of days or possibly rent one for now. What scanner would you recommend buying? I have been wanting to get one for a while anyways. Of course I'd like to get by expensively but I don't mind spending a little more for something that's going to be as useful as the scanners probably are. Thanks again for the reply.
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