Ford Focus Forum, Ford Focus ST Forum - View Single Post - SVT with sudden rough idle, power loss
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Old 02-02-2013, 06:27 PM   #70
swansong
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What I Drive: 2008 Saab 9-3 Aero SportCombi XWD

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It is possible the ECU is bad, and I've had it suggested before. However, being an electrical engineer, I find it very unlikely that an ECU would just "go bad". They should be one of if not the most dependable electronic component on the car. I would be inclined to suspect many other parts before giving in and replacing the ECU as a last resort. In my case, I don't have any strange codes to suggest it, just strange operating characteristics.

All that said, strange things happen and it very well could be the ECU.
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Mine: 2008 Saab 9-3 Aero SportCombi XWD: 88k, Black, Manual, JZW Stage 1. 320hp/400tq.
Gone: 2002 SVT, #1654

Hers: 2010 Focus SES: 80k, Ebony, Auto, Moon and Tune
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