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post #9 of (permalink) Old 2nd September 2009
Technical Supremo

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Over or underfueling can cause a rough idle but so can many other things unfortunately. For instance a faulty coolant sensor can have th esame affect. Unplugging the IAT can make the ECU go into default mode so it is possible something else may be the cause.

Have you checked the colour of the spark plugs - too dark will denote over-fueling and too white denote under-fueling.

P.S. Does the engine idle rough when bot cold an dhot or is there any difference??
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