Random multiple misfires on cold starts.

  1. Infrequent Poster Joined: May 2009 York-Hull Posts: 222 Saxo VTR MK2
    #1
    Was ok on some warm days but has been misfiring on startup all winter doesn't always do it instantly, takes about a second or two to start judering, therefore ruling out starter motor etc. Cant work it out realy. Simple fix is to turn it off and on again in about 8 seconds, then it appears to clear it except the engine management lights still on.

    Any suggestions on what to replace/test? Did do it once while i was driving along, but only once. Was thinking maybe crank sensor or temperature sensor?
  2. Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0
    #2
    My money is on dampness. Mine was doing it so I sprayed WD40 on the alternator and all the sensor connections, to disperse any water, it's been fine since.

    Older engines used to suffer from this alot.
  3. Infrequent Poster Joined: May 2009 York-Hull Posts: 222 Saxo VTR MK2
    #3
    Well i swapped the coild pack (forgot to say) on a warm day, spraying wd when doing so to stop dampness, would you say this would help? What other sensors etc would do it?
  4. Frequent Poster Joined: Nov 2009 Hull Posts: 983 01' Ph1 VTS
    #4
    Quote:
    Originally Posted by stured View Post
    Well i swapped the coild pack (forgot to say) on a warm day, spraying wd when doing so to stop dampness, would you say this would help? What other sensors etc would do it?
    WD40 every sensor/plug you can see and remove especially the multiplug that connects to the coil pack, i took my car to citroen and all they did was spray some WD down where the spark plugs go onto the coil pack apparently its a cache22 subject with it. some agree others dont. i havent had a single miss since.
  5. Saxperience Post Whore Joined: Oct 2009 Basildon And Corringham, Essex Posts: 5179 MK1 Focus RS, Discovery TD5, Renault Trafic 2.0
    #5
    Quote:
    Originally Posted by JonCarter View Post
    WD40 every sensor/plug you can see and remove especially the multiplug that connects to the coil pack, i took my car to citroen and all they did was spray some WD down where the spark plugs go onto the coil pack apparently its a cache22 subject with it. some agree others dont. i havent had a single miss since.
    I always WD40 before I take anything off. 8/10 times it'll fix it

    Did they charge you for that?
  6. Frequent Poster Joined: Nov 2009 Hull Posts: 983 01' Ph1 VTS
    #6
    Quote:
    Originally Posted by Bikekid450 View Post
    I always WD40 before I take anything off. 8/10 times it'll fix it

    Did they charge you for that?
    No since im pretty much a regular visitor i might as well as have my own space
  7. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #7
    If your EML is on then get it scanned that way you won`t be paying out for parts you don`t need.

    Steve.