Focus Fanatics - View Single Post - Help! 2003 Ford Focus ZX5 - O2 sensor
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Old 09-29-2012, 04:30 AM   #9
sleepyboy
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Join Date: Nov 2004
Fan#: 15335
Location: SW Houston, TX, United States
What I Drive: 01' Yellow ZX3 euro, 04' ZX5 SVT

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The Idle Air Control valve would be my next guess. You can try removing it and cleaning it. That may help or even fix it. They are kind of pricey so that's why a lot of us clean them. Most of the time it works. You can clean it with Brake Cleaner and a little brush. Here is a how to on replacing it. You don't have to take the intake manifold off but it's a tight squeeze. LINK
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