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Old 04-01-2013, 11:04 AM   #18
Focus Rookie
Join Date: May 2012
Fan#: 99593
Location: Springfield, OR
What I Drive: 2003 Focus SE

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For the benefit of anyone trying to work through a stall issue, my solution to this problem ended up not having anything to do with O2 sensors or vacuum. Thanks to a "pending" code in the ECU (which I can't remember now) I started looking at the ignition. The wiring harness the carries the wires that run to the coil run adjacent to one of the exhaust re-circulation pipes (I think that's what it is - it has a braided insulation wrap) and it had melted through the harness and exposed some of the wire. I spliced in a new piece ... I thought that hadn't done anything (idle sounded off), so I gave up and finally took it to a shop. They drove it 30 miles and told me everything was running fine (fuel trims, etc), and I've been driving with no issues. The idle still doesn't sound as stable as I would expect, but it's running fine and - most importantly - no stalls.
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