Fiesta Idling too fast
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Anyone got any ideas?
___________________ if ain't broke don't fix it
Thanks for the info. There are no leaks in any pipes as far as I can see. If you slow the engine down by going into gear and gently releasing the clutch with the handbrake on to drag the engine down to about 1K revs then it will stay there, until you press the gas pedal and take it above 3K say, then it will stay there at that speed. Makes driving difficult and uses a lot of petrol! Any way, if you remove the plug from the Throttle position pot it behaves itself, and the engine behaves as normal. So the other day at work, I made up a 1K variable pot and a 100 ohm resistor and encapsulated it in epoxy. I then connected this between ground and the wiper of the throttle pot. At idle the throttle pot measured 0.9v. By adjusting my new pot I could vary the idle voltage fed to the engine management. I found by trial and error that if I set it to about 0.4v then all my problems went away and the engine idled correctly and the revs didn't "hang on" at all. I have used it quite a lot with the mod on and can't fault it, hot or cold. Apparently the correct voltage is 0.9v: my throttle pot was completely predictable and measured 63 or so ohms when shut. Simple maths, with 5v at the top of the pot give 0.9v as expected. Anyway, at 0.4v it all works fine! It may be that disconnecting the engine management would sort it all out, force a reset. Unfortunately I don't have the code for the radio, so I will need to remove the fuse to the unit....do you know what the fuse is called? Is doing this reset likely to cause any grief? If this is a problem known to Ford, what is the official fix? Thanks for your help Tony Taunton
Messages 1 to 4 of 4.
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