Do I need a new thermo time switch, or is it something else?

Discussion in 'K-Jetronic OEM injection' started by ClassicCompetition, Oct 20, 2012.

  1. CLASSICCOMPETITION

    ClassicCompetition Forum Member

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    My 1.6 mk1 starts from cold on the first turn of the key and runs well as if the cold start system is working perfectly. After about 5 seconds revs drop and splutters, droping on to 2 or 3 cylinders and the car required coaxing for a minute or two before it smooths out. Car is well serviced and runs well when warm.

    Thanks
     
    ClassicCompetition, Oct 20, 2012
    #1
  2. GAZ37

    Gaz37 The Grouch. Paid Member

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    May be the warm up regulator, but when mine was playing up the car just cut out with no misfiring.

    I think you can test the WUR using a resistance meter thingy, electrics are beyond me
     
    Gaz37, Oct 20, 2012
    #2
  3. JOESOAP

    Joesoap Forum Member

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    What he said mate it will be your warm up reg :thumbup:
     
    Joesoap, Oct 20, 2012
    #3
  4. ALANBE2

    alanbe2 Paid Member Paid Member

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    You can test the resistance to check whether it's caput or not. Can't remember what it should be, but the figures are quoted in the Haynes/Bentley manual (all my copies are in boxes, in middle of moving!)
     
    alanbe2, Oct 20, 2012
    #4
  5. Brian.G

    Brian.G Forum Member

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    Thermo time switch 158euro too, :o

    Brian,
     
    Brian.G, Oct 20, 2012
    #5
  6. JOESOAP

    Joesoap Forum Member

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    10 here [:D] + post
     
    Joesoap, Oct 20, 2012
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  7. MUSHY 16V

    MUSHY 16V Moderator Staff Member Moderator

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    aye not cheap the price sounds a bit better in pounds thuogh about 75
    just as well i have a few in the tool box
     
    MUSHY 16V, Oct 20, 2012
    #7
  8. MUSHY 16V

    MUSHY 16V Moderator Staff Member Moderator

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    the 5 injecor stays on for 3 to 5 seconds when the engine temp is below 30c if it's working right

    see the thread below

    http://www.clubgti.com/showthread.php?189586-16v-temp-sensors&p=1708096&viewfull=1#post1708096
     
    MUSHY 16V, Oct 21, 2012
    #8
  9. Brian.G

    Brian.G Forum Member

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    You sure on that Joe, for a genuine Bosch? Maybe I shouldnt have said it was for a Porsche then.

    Brian,
     
    Brian.G, Oct 22, 2012
    #9
  10. rubjonny

    rubjonny Administrator Staff Member Admin

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    if you suspect the cold start system is to blame simply disconnect the plug to the 5th injector straight after the car has started. if the problem still occurs, its not the cold start system (unless the 5th injector is stuck open, but this is unlikely)

    as above the 5tgh injector will only spray if the engine is cold, and only when cranking. once its started the system is no longer required :) the above test will rule out some kind of wiring fault causing the 5th injector to spray when it shouldnt
     
    rubjonny, Oct 23, 2012
    #10

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