punto_td

my neighbours got a n reg (mk6) escort with 1.6 zetec engine, it is an automatic.

within the first 1-2 minutes of it running it runs rather lumpy, engine shakes about like the revs are too low (only slightly though) and just sounds poorly, and if you put it into reverse, then drive, it will just cut out, (starts straight back up) after 2-3 mins of running it runs normally, engines runs smooth and doesnt cut out.

do these have some sort of auto choke system or what controls the extra fueling when cold? cos its like it runs like you havent got the choke out enough if you get me, but obviously it doesnt have manual choke.

combivan

there is a sensor on top of the thermostat housing that controls the fuel for hot cold running

tabetha

It could well be the CTS, coolant temperature sensor, this is what tells the ecu, electronic control unit what to do fuelling wise based on temperature throttle other sensor input etc.
This is to be found on the thermostat housing, you'll easily know if you have the right one as unplugging it with the engine running will cause the fan/s to come on.
There is another in the same area which is also a temp sensor, but this is for the gauge and nothing to do with the engine's running.
It could be a number of other things though, particularly with it being an auto, there is so much more load on the engine at idle from the auto box they are very sensitive to running lean, so I'd also get the co checked and look for the usual suspects like air leaks, especially on the dreaded "T" connector rear of head underside linked into the pcv system.
tabetha

punto_td

ok cheers people, il have a play about with it and go from there.