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, 09:43 AM   #5
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Location: bristol, TN
What I Drive: 2001 maroon focus

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Originally Posted by FocusRus View Post
Have you detected any vacuum leaks? The ecm is trying to richen up the system in what is prehaps a lean condition on a cylinder(s). Who installed the head....used, new, rebuilt..etc ?
I don't see or hear any obvious vacuum leaks and I checked it over pretty well. The head is a rebuilt and looked like they did a really good job. I installed the head and did use new bolts. Like I said it ran great for a couple days..the engine ran better than it ever had and so quiet you can barely tell its running. Whatever happened seemed to be all of the sudden. Thanks very much for your reply.
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