Saxo VTS: Fine - Misfires - Doesn't start

  1. Newbie Joined: Sep 2013 Posts: 18
    #1
    My Saxo VTS (02) has a peculiar problem.

    Firstly, the engine management light comes on (usually after 9 miles of driving.) and it begins to miss fire, this gets worse as i drive, by this i mean if i stop at the traffic lights the revs drop and the car stalls and refuses to start. The engine turns but doesn't hold revs to keep it at idle.

    The only way the car will start is by clearing the faults, this is a temporary fix as after 9 miles the fault occurs again and we're in the cycle of clearing faults etc.

    When the faults are cleared it drives perfect until it reaches the 9 mile barrier.

    Crankshaft sensor?
  2. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #2
    Well it would help if we know the fault codes lol.
  3. Newbie Joined: Sep 2013 Posts: 18
    #3
    Here's the image, bear in mind once the faults are cleared it drives fine and after 9 miles of driving the engine management light comes on then. Once faults cleared it starts fine so the faults occur whilst driving.



  4. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #4
    New coil pack for starters & unless you fix the problems the codes will come back along with the eml.
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  5. Newbie Joined: Sep 2013 Posts: 18
    #5
    Cheers. Looks like I'll start with that.

    Would the coil park be intermittent? As in, the car runs fine until the eml makes it's appearance. I thought the coilpack was just a problem with starting per se.
  6. Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.
    #6
    Map sensor!!
  7. Newbie Joined: Sep 2013 Posts: 18
    #7
    Okay, changed the crankshaft sensor (cheapest first) which didn't resolve the issue. So, as suggested I'm trying new coil pack within next few days. Then it'll be MAP sensor.

    Realised why it runs fine up to 9 miles, that's how long it takes to heat up. So once I clear the codes and let it cool down it will start & run fine for 9 miles. If I don't let it cool down it will not start even if the codes are cleared.

    Will update with results.
  8. Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182
    #8
    What about the coolant temperature sensor too?


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  9. Newbie Joined: Sep 2013 Posts: 18
    #9
    I shall bear that in mind too. Thanks.
  10. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #10
    Quote:
    Originally Posted by McAbsent View Post
    I shall bear that in mind too. Thanks.
    When a coil pack is breaking down they often do it when hot,hence letting the car cool down then starting the car.mine did the exact same thing.
  11. Newbie Joined: Sep 2013 Posts: 18
    #11
    Okay so, crankshaft sensor changed, coil pack now changed, yet problem persists.

    Next suggestions appear to be MAP sensor & coolant temperature sensor.

    This is getting ridiculous. Anyone want to buy a VTS? Drives fine for 15 minutes the EML comes on then begins to miss. Then it goes into limp mode before breaking down and doesn't restart until it's cool and faults are cleared.
  12. Saxperience Hardcore! Joined: Dec 2007 smurfland. Posts: 17346 Ex saxo owner.
    #12
    Get a compression test done.