Wiring up Idle Control Valve

Discussion in 'K-Jetronic OEM injection' started by Breadfan83, Jun 25, 2019.

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  1. rubjonny

    rubjonny Administrator Staff Member Admin

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    can check fuel pressure as per the picture I put up on last page, that'll help you narrow down the issue. check the return line isnt blocked first of all that would be one way pressure is too high even with new fpr. make sure the vacuum line is correctly hooked up as well it should be on the nipple closest to the inlet manifold
     
    rubjonny, Mar 3, 2021
    #41
  2. ANDREW POWELL

    Andrew Powell New Member

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    Hello can I check the vac line I have two nipples :oavailable the one closest to the crank case breather pipe is not attached to anything and is open to air the one next two it heading towards the fuel return is connected to the fpr is this correct
     
    Andrew Powell, Mar 3, 2021
    #42
  3. rubjonny

    rubjonny Administrator Staff Member Admin

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    on the throttle you have 3 vacuum nipples, the one round the back and the one nearest the rubber boot are both capped off and the one nearest the inlet manifold goes direct to the FPR (originally theres a T piece to also feed warm air feed flap in airbox but this can be deleted)
     
    rubjonny, Mar 4, 2021
    #43
  4. ANDREW POWELL

    Andrew Powell New Member

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    Quick update we have put a jubilee clip on the main fuel line feeding the rail and reduced the pipe to simulate lower pressure fuel entering the fuel rail and this has confirmed high fuel pressure is causing the hot start problem so now its a case of identifying root cause and fixing that and hopefully sorted :thumbup:
     
    Andrew Powell, Mar 5, 2021
    #44
  5. H8V

    h8v Forum Member

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    h8v, Mar 5, 2021
    #45
    Simon Peter Dodgson and Andrew Powell like this.
  6. SIMON PETER DODGSON

    Simon Peter Dodgson Forum Member

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    Would love to know why my pb starves at 4k. Could you put gauge in car when driving to see what happensdo you think?
     
    Simon Peter Dodgson, Mar 6, 2021
    #46
  7. H8V

    h8v Forum Member

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    I guess you could. The gauge is connected to the nipple at the end of the fuel rail (having removed the end screw plug) by a length of 7mm fuel hose.

    It's just a case of using a suitable length of hose to have the gauge on view in the car. Do make sure all the connections are firmly fixed..you wouldn't want fuel under 3 Bar pressure spraying in either the engine bay or the inside of the car!
     
    h8v, Mar 6, 2021
    #47
    Simon Peter Dodgson likes this.
  8. SIMON PETER DODGSON

    Simon Peter Dodgson Forum Member

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    I think I'm going to try this. Already set fire to it once emptying cylinders full of petrol (ecu bad earth) and forgot to disconnect coil when cranking. Not something I want to repeat!
     
    Simon Peter Dodgson, Mar 6, 2021
    #48
  9. ANDREW POWELL

    Andrew Powell New Member

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    OK fuel pressure has tested fine so all my magic jubilee clip is doing is reducing fuel flow to injectors. We think the ecu is sending a cold fuel map to the injectors rather than understanding the engine is hot. To help advice we have fitted a hella temp sensor and ecu plug reading back to sensor is ok so not sure what could be causing it now so any ideas greatly received as drawn a blank again!
     
    Last edited: Mar 19, 2021
    Andrew Powell, Mar 12, 2021
    #49
  10. ANDREW POWELL

    Andrew Powell New Member

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    HI sourced a replacement ECU and this fixed fault however despite me asking about earths to engine and getting assurances it is ok it appears my earth is not and I have blown my second ECU so in need of another Digifant II Bosch 0261200298 037906022N if any one can help me replace I would be most grateful
     
    Andrew Powell, May 13, 2021
    #50
  11. SIMON PETER DODGSON

    Simon Peter Dodgson Forum Member

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    Why not just resoilder blown track?
     
    Simon Peter Dodgson, May 14, 2021
    #51
  12. ANDREW POWELL

    Andrew Powell New Member

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    Don't have those skills
     
    Andrew Powell, May 14, 2021
    #52
  13. NateS2

    NateS2 Paid Member Paid Member

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    I can do it for you if you need, it normally takes some MOSFETS out too which I can replace. Would be interested to take a look at your old ECU to see if I can find what was wrong with it, seems like you had a really odd fault so it would be nice to see if I can diagnose it!
     
    Last edited: May 14, 2021
    NateS2, May 14, 2021
    #53
  14. FRANCISCO JAVIER BELMONTE

    Francisco Javier Belmonte New Member

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    Hi, I have the same problem, I’m Spanish my English is very bad, I need the diagrams, but I can’t see this, the page said “you haven’t permission” what’s the problem? Thanks
     
    Francisco Javier Belmonte, Jan 19, 2023
    #54
  15. rubjonny

    rubjonny Administrator Staff Member Admin

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    fixed them, the problem was becasue they were so huge the forum put them as attachments rather than normal image (6000 pixels wide :lol:)
     
    rubjonny, Jan 19, 2023
    #55
  16. FRANCISCO JAVIER BELMONTE

    Francisco Javier Belmonte New Member

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    Hi my problem is, I don’t have 12v in the isv, if you have a mail, send me a private message for send you a video with a problem
     
    Francisco Javier Belmonte, Jan 19, 2023
    #56
  17. rubjonny

    rubjonny Administrator Staff Member Admin

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    first check would be you have ignition live to the black wire on your isv controller, and earth on the brown/white :)
     
    rubjonny, Jan 20, 2023
    #57
  18. FRANCISCO JAVIER BELMONTE

    Francisco Javier Belmonte New Member

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    Yes I have 12v in the wire 5 (white and brown) and 14 (black)
     
    Francisco Javier Belmonte, Jan 20, 2023
    #58
  19. FRANCISCO JAVIER BELMONTE

    Francisco Javier Belmonte New Member

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    I can’t upload pics :(
     
    Francisco Javier Belmonte, Jan 20, 2023
    #59
  20. rubjonny

    rubjonny Administrator Staff Member Admin

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    once you get more posts this option will become available, so thats all good. have you checked both wires from isv to the controller are good as per the 1st post? the black/yellow wire on the controller is the idle switch closed feed, you should see ignition live here with throttle closed then 0v when throttle is open. the green/red goes to the temp sensor on the side of the head, to check the sensors on the head swap the yellow/red dash temp wire to each one and take the car for a drive to make sure the dash temp readings are roughly the same on all 3. Alternatively you can check the resistances:
    -20°c - 6.5k ohm
    -15°c - 5k ohm
    -10°c - 3.8k ohm
    -5°c - 3.05k ohm
    0°c - 2.5k ohm
    20°c - 1000 ohm
    40°c - 450 ohm
    60°c - 250 ohm
    80°c - 140 ohm
    90°c - 102 ohm
    100°c - 75/100 ohm
    110°c - 50 ohm
    120°c - 47.5 ohm
     
    rubjonny, Jan 20, 2023
    #60
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