Food & Drink2 mins ago
Fiesta auto problems (again!)
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For more on marking an answer as the "Best Answer", please visit our FAQ.On older Fiesta's, there is a device called an anti-dieseling valve. it cuts off the fuel supply when the ignition is switched off and stops the engine running on (like a diesel). I say older: mine is a Mark 3 1990 and it has one: the engine is called an HCS engine, they may be fitted on newer models, and other engine types too
I had a lot of hassle with one of these, until I found I had knocked the connector off the carburettor! it was a cylindrical push-on connector, went onto a connector on the carb which looks like a screw thread.
probably worth a look for a bit of wire that goes nowhere, hanging around somewhere near the engione (almost certainly in a place thats not obvious!)
I spent ages tinkering with the idle speed and mixture, it did run ok for some of the time after fiddling but after a while it would not idel (ie cut out when you take your foot off the accelerator)
good luck!