Vtr revving itself when hot?

  1. Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project
    #1
    title explains it really.. Ive tried:

    ICV
    Coolant sensor
    Map Sensor
    Crank sensor

    It only does it when hot, when car is 1st started up its fine.. Im really confused about this don't know what else it could be?
  2. Infrequent Poster Joined: Sep 2010 Heathrow Posts: 172 1999 Saxo VTR, 1983 Mercedes 250 LWB Lowrider.
    #2
    It has got to be coolant temp sensor, goes in the thermostat housing(green plug).
  3. Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project
    #3
    Ive replaced it for a new one and still doing it, could it possibly be a vacuum pipe problem?
  4. Established Member Joined: Sep 2010 Portsmouth Posts: 1936 Scirocco
    #4
    idle control valve?
    sometimes after doing a motorway journey and coming to a stop, my rev counter on my vtr bounces... its annoying, but unless something goes wrong, im not paying to fix it lol
  5. Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project
    #5
    I have changed the idle control valve which kinda helped for a bit but I think its something more than that. Sometimes the car will just keep climbing revs and the only way to stop it is to turn the car off and restart it.
  6. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #6
    Check your vacuum pipes for a split,it could be sucking in air.Coil packs that are faulty can act up when hot too.

    Steve.
  7. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #7
    Quote:
    Originally Posted by nut2010 View Post
    sell it
    You`ll go a long way on here lol.


    Steve.
  8. Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project
    #8
    Still having this problem and its definately only when hot, doesnt matter if its the engine thats hot or if its just a really hot day, If its a cool day it won't start doing it until the engines warmed up and I sit in traffic or whatever, if its a hot day it will just do it as soon as the cars started up. I've checked the vacuum pipes allover and I can't find anything wrong with it. Is there any way of checking the coil pack without replacing it as this is getting expensive now lol does any1 have any other ideas its driving me up the wall!
  9. L-plater Joined: Jul 2011 Hampton Posts: 89 02 Ice Grey Saxo Furio/VTR
    #9
    Quote:
    Originally Posted by stevo67 View Post
    Check your vacuum pipes for a split

    Steve.
    +1 Check for air leaks
  10. L-plater Joined: Feb 2011 Birmingham Posts: 58 Citreon Saxo VTR Citreon Saxo VTS
    #10
    proberbly a complete long shot but i once bought a new sensor for my saxo it was a temperature sensor and that didnt work either so i bought another new part and it worked so it could still be your coolant sensor.
  11. Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project
    #11
    I have had a look at the pipes on the inlet and can't see any visible signs of a leak, is there a better way of checking it? I tried listening for a leak but to be honest can't really hear alot when the engines running lol. was wondering aswell, with the coolant temp sensor does the ecu need to be reset or anything or should it just cure the problem by swapping it if its that? just a thought
  12. Saxperience Forum Bum Joined: Mar 2009 Stoke-on-trent Posts: 2640 Mk5 Golf GTTDI Mk2 VTR Project
    #12
    finally getting to the bottom of this can hear a slight leak when idling like its sucking air but can't find where exactly, it must be opening up more when the car is hot, well thats my thinking anyways so gonna get some carb cleaner/brake cleaner tommorrow and try find the leak