Xantia – Idle problem

[lancia58]

I have a Citroen Xantia 2.0 16V SX make year 2000. Recently the when I stop or depress the accelerating pedal it takes time till the revs falls back to 800. When I stop ( and engine is running ) the revs are at 1100 – 1200 and then slowly it may fall to 900 but it take time. Any suggestions

Thanks
Zohar

[addo]

That sounds like a vacuum leak; there is more air getting in so the motor asks for more fuel - revs go up in response. At idle the computer recognises there is no accelerator being applied, so it gradually cuts back the step count for your idle controller.

[citronut]

could also be the idle stteper motor startting to fail,

remove it from the throtle body, blast it out with carb cleaner, then give it a blast with duck oil or a very light oil, but DO NOT USE the W stuff (WD40) crap,

i used to find useing carb cleaner would sort them long enough to proove it was at fault, but then they would almost certainly die,

till i found i could recover one that had died in thois way by giveing it a shot of duck oil,

obviously the carb cleaner dry's it out inside which causes it to stick/bind,

regards malcolm