saxo revs up on its own.help?

1. chippa L-plater Joined: May 2008 walsall west mids Posts: 34 mk1 citroen saxo vtr

   #1 30th May 2008, 18:43

   hi there just wondering if anyone can help sort my saxo out .for the last couple of weeks when car gets hot. at a standstill it revs up to just under 2000 revs then it will go down to about 1400 then all of a sudden it will go ok.also last 2 times ive started it small amount of black smoke comes out exhaust's.and it seems as though it dont want to start.its a 99[s] reg vtr mk 1 as anyone else had this prob
2. fossie Saxperience Forum Bum Joined: Oct 2004 Spennymoor, United Kingdom (England) Posts: 3742 Saxo MK2 VTS

   #2 30th May 2008, 19:10

   idle control valve......possibly
3. frankie Saxperience Addict Joined: Apr 2006 Frome, down deepest, darkest zummerset Posts: 12971 VTRallye

   #3 30th May 2008, 19:12

   idle control, sparks coilpack.
   
   changed first 2 and its loads better.
4. Ashleyp Saxperience Hardcore! Joined: Apr 2008 Bedford & Manchester Posts: 17504

   #4 30th May 2008, 19:15

   http://www.saxperience.com/forum/showthread.php?t=51637
   
   read this mate
   
   hope it helps
5. chippa L-plater Joined: May 2008 walsall west mids Posts: 34 mk1 citroen saxo vtr

   #5 30th May 2008, 21:02

   thanks to all of you for your reply's and i am going to check that thread out now.i took car back to garage i brought it from [only had it 1 month]and they said it was the idle valve' so they said they had fixed it and showed me the old one so i thought it would be sorted untill on the way back when it started warming up it was still the same. so dont know whether they changed it or its not the idle valve.i have got it booked in tomorrow for full service and to be lowered 40mm so i will get them to look at it thanks again guys.
6. Ashleyp Saxperience Hardcore! Joined: Apr 2008 Bedford & Manchester Posts: 17504

   #6 30th May 2008, 21:11

   yeah.. could be spark plugs or coil pack.. ive got same kinda problem developing at the min.. but cant afford to get it fixed for a month
7. chippa L-plater Joined: May 2008 walsall west mids Posts: 34 mk1 citroen saxo vtr

   #7 2nd June 2008, 23:12

   just like to say a big thanks to the people who tryed to help me solve me problem. it was green coolant sensor the one for the ecu not temperture gauge.if anyone else has same problem try taking plug off green coolant sensor then try it. my car sounds and drives perfect now with plug off got to get one tomorrow.if anyone does take plug off to test drive make sure you warm car up before you drive.its to do with engine thinking that it is colder than it is and it puts choke in. also runs very rich'not sayin this is answer to every revving problem but its worth a try first as i had my car booked in at citroen monday coming to change idle valve which is 80to100£ so saved a bit of money as green sensor only round about tenner. my car was idling very irratic all the while now its ok sorted......big up the saxo's