Idle problem

1. Vtralex Regular Poster Joined: Jan 2010 High wycombe Posts: 435 Mk1 saxo vts

   #1 8th July 2010, 21:46

   Had to have a new engine fitted in my mk 1 vtr, since then idling hs been quite high, was revving up to 2500. So swapped off the original icv, inlet manifold, throttle body and its now stopped revving as high, tends to sit around 1500. Any ideas what the problem might be? they wont do my emissions test because of it so cant get a mot. Also checked for any air leaks and there was none.
2. Sparco_Tom Saxperience Addict Joined: Jan 2007 Aylesbury, Bucks Posts: 12836 Yeaaahh Fiesta

   #2 9th July 2010, 01:22

   map sensor, ecu coolant temp, idle control, throttle pot sensor?
3. Vtralex Regular Poster Joined: Jan 2010 High wycombe Posts: 435 Mk1 saxo vts

   #3 9th July 2010, 12:14

   So presumeably the easiest way is to get it on a diagnostic thing and find out what the sensors are all doing?
4. iSlayeR Established Member Joined: Aug 2009 King's lynn Posts: 2073 Turbocharged vtr

   #4 9th July 2010, 12:17

   Check the thottle cable isn't sticking.
5. Vtralex Regular Poster Joined: Jan 2010 High wycombe Posts: 435 Mk1 saxo vts

   #5 9th July 2010, 13:18

   Thats what i thought... Being as it idled at about 1200 when we swapped over all the other bits, then as soon as it comes to testing the emissions, it shoots back up to about 1600 and they complain about the idle being too high