1993 Fiesta1.1 engine revving at idle?

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Wed 14 Jun 2006 09:24
1993 Fiesta1.1 engine revving at idle? - fiesta1.1
We have just bought a CFI fiesta 1.1 1993 with a genuine 21800 miles from new.It drives as new but has an intermittent fault. The car occasionally 'drives itself', lifting your foot off the throttle doesnt slow the car, and if you dip the clutch the engine is racing. Sometimes when you stop at a junction it will be racing, sometimes the revs surge violently up and down before settling. I dont really know where to start looking, so any pointers would be great. Cheers.
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Wed 14 Jun 2006 10:11
1993 Fiesta1.1 engine revving at idle? - Collos25
Stepper motor on the throttle body or its sensor is a good place to start.
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Wed 14 Jun 2006 15:47
1993 Fiesta1.1 engine revving at idle? - fiesta1.1
Thanks. What stepper motor and sensor do you mean, the ISC? Where is it on the throttle body? Is there any info on the CFI system that you know of? Finally, what are your thoughts on it being a lambda sensor or coolant temp sensor as it is doing around 30 mpg... i guess it should be a bit better than that.
thanks
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Wed 14 Jun 2006 16:58
1993 Fiesta1.1 engine revving at idle? - Galaxy
My late father owned a Fiesta 1.3 CFI.

There seemed to be very little information around about the CFI engine. Amazingly it isn't even covered in the Haynes Fiesta manual, which for Haynes is pretty unusual. Their manuals usually cover all model variations.

His car did at one time race like crazy when releasing the accellerator pedal. We never did find out why this was, only that turning the ignition off and then on again cured the problem completely, until the next time.

Eventually the fault cured itself, we never did find out why.
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