lumpy and misfiring when cold?

  1. Frequent Poster Joined: Mar 2009 High Wycombe / Portsmouth / Canterbury Posts: 703 Mk1 Vtr & Mk2 Vtr
    #1
    Just a quick one, when its cold sometimes it runs lumpy and misfires, but once hits temperature it runs perfectly. I asume it would be the MAP sensor, but could it be the coolant temp sensor, even though the coolant dial works perfectly?

    sorry its for a 2002 vtr mk2, (i no its defintly a mk2 ph2 just not sure on the year as its my brother in laws.)
  2. Frequent Poster Joined: Jul 2010 gateshead Posts: 807 vw golf GTI citroen saxo forte 02 plate vw polo
    #2
    whats the plugs like mate
  3. Infrequent Poster Joined: Jan 2011 Newcastle upon Tyne Posts: 171 1.1 MK2
    #3
    Same problem. Wild goose chase Mine cuts out sometimes... engine light has been on and off once or twice too and diagnostics have come back at different times as being bothThrottle Position Sensor and some kind of "Oxygen Enrichment". Still haven't had it sorted because will cost a lot to pin point the problem (IMO).

    How old is yours? I am starting to think that mine might just be problems with fuel pump... it seems to run a treat when there is more petrol in the tank... but saying that, even if the tank is empty, a lot of weight in the boot also seems to solve the problem... bloody frenchcars
  4. Frequent Poster Joined: Mar 2009 High Wycombe / Portsmouth / Canterbury Posts: 703 Mk1 Vtr & Mk2 Vtr
    #4
    when you say whats the plug like what do you mean exactly?
  5. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #5
    Quote:
    Originally Posted by hammy105 View Post
    Just a quick one, when its cold sometimes it runs lumpy and misfires, but once hits temperature it runs perfectly. I asume it would be the MAP sensor, but could it be the coolant temp sensor, even though the coolant dial works perfectly?

    sorry its for a 2002 vtr mk2, (i no its defintly a mk2 ph2 just not sure on the year as its my brother in laws.)
    Your getting confused mate,theres 1 sensor for the gauge & 1 for the ecu its the coolant temperature sensor that often plays up both located on the thermostat housing.


    Steve.