Ford Fiesta (1995 - 1999) - 1999 1.25 eratic idle when cold

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Wed 1 Oct 2008 23:27
1999 1.25 eratic idle when cold - dieselpower
My girlfriends 1.25 fiesta has started to idle poor when cold it nearly dies out then tries to revive itself by reving slightly! possible a idle controll valve but whats throwing me off is it seems to improve when the engine warms up. Any ideas cheers.

One more thing ive only cold air inside the car when the engine is running at normal temp the water is circulating through the heater matrix as both pipe are hot, would this be most likely to be the control switch on the dash?

Edited by Dynamic Dave on 02/10/2008 at 00:27

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Sat 4 Oct 2008 21:13
1999 1.25 eratic idle when cold - Screwloose

Normally more likely to be the heater control valve.

Make sure that you haven't got an air leak or split breather hose for the idle fault.
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Sat 4 Oct 2008 22:17
1999 1.25 eratic idle when cold - DP
I would agree on the heater control valve. A common problem on Fiestas.

The two heater hoses are on the engine side of the valve, and the valve has a bypass channel which allows the coolant to circulate when the valve is closed off. Therefore these hoses will get hot regardless of whether the valve is open, closed, faulty or working.


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