HOW TO: Check, repair and tune your MK2/Corrado 1.8 16v

Discussion in '16-valve' started by rubjonny, Jul 16, 2009.

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  1. rubjonny

    rubjonny Administrator Staff Member Admin

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    updated with fuel injector test info :)
     
    rubjonny, Nov 29, 2013
    #41
  2. STEREOFLAVER

    stereoflaver New Member

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    stereoflaver, Jan 29, 2014
    #42
  3. KARMANNSKI

    karmannski New Member

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    Hi I wonder if there is other link with the guide for the 2.0 9a engines for corrado of how to tune it
    this one is not worrking
     
    karmannski, Apr 7, 2015
    #43
  4. rubjonny

    rubjonny Administrator Staff Member Admin

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    rubjonny, Apr 7, 2015
    #44
  5. PINGMAN

    pingman New Member

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    I have both these problems; odd occasional random miss/hold-back and my tacho drops straight past 2/3k down to ~1000 (occasionally dies) with a fast fall.

    No leaks on the the over-run valve piping that I can see.
    I've electrically charged it and it audibly clicks.
    I have good ign live on the yellow/black wire.
    As far as I can tell; no switched earth on the brown/black (BUT i'm not sure in what situation it should have a signal?? at idle from cold start?)

    Is it likely my ISV control unit is dead?
    Presumably that would be the likely culprit for the hunting and rich idle I have too?
     
    pingman, May 13, 2018
    #45
  6. rubjonny

    rubjonny Administrator Staff Member Admin

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    the brown.black is triggered when you lift off from high rpm by the isv controller, have a look at the red/black wire from the controller to the spade connector near the coil and check the brown/white wires to the head as one of them is for the isv module
     
    rubjonny, May 14, 2018
    #46
  7. PINGMAN

    pingman New Member

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    So If I rev it up to 5000 and let off the throttle I should see continuity with body earth on the black brown?
    could you advise what/how should I check the other two?
     
    pingman, May 14, 2018
    #47
  8. rubjonny

    rubjonny Administrator Staff Member Admin

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    yep. easy to check the brown/white is good just check for ignition voltaghe between the black wire and the brown/white on the isv controller plug, for the red/black check for continuity between the isv pin and the coil negative :)
     
    rubjonny, May 15, 2018
    #48
  9. WONE

    wone New Member

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    thank you
     
    wone, Sep 23, 2021
    #49
  10. GVK

    GVK Paid Member Paid Member

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    Rubber Jonny is mentioned here :p

     
    GVK, Aug 26, 2022
    #50
    rubjonny likes this.
  11. rubjonny

    rubjonny Administrator Staff Member Admin

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    Finally! My big break, I have arrived :lol:
     
    rubjonny, Aug 26, 2022
    #51
    costel1969, GVK and AKAeddypeck like this.
  12. GVK

    GVK Paid Member Paid Member

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    Check the comments, in a moment of confusion he thought that I was Rubjonny lol
     
    GVK, Aug 26, 2022
    #52
  13. ZACMK2

    Zacmk2 New Member

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    hey guys hope everyone is well.

    Read this thread thoroughly an is very helpful.

    when i disconnect the black and red to the isv. my kr wont start one bit. any ideas. only just bought the old girl the other day and she is low on power and idling poorly.
     
    Zacmk2, Mar 9, 2023
    #53
  14. rubjonny

    rubjonny Administrator Staff Member Admin

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    wind out the idle screw a bit that should hopefully get it going
     
    rubjonny, Mar 9, 2023
    #54
  15. BEN225

    ben225 New Member

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    hi i'm trying to set up my valver, however when i disconnect the red lead from distributer and there is no drop in revs. My idle screw is also all the way out and the engine is still sitting at 1k.

    Any ideas?
     
    ben225, Jul 25, 2024
    #55
  16. rubjonny

    rubjonny Administrator Staff Member Admin

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    Check the ignition timing, also do all the other checks top to bottom
     
    rubjonny, Jul 25, 2024
    #56
    ben225 likes this.
  17. BEN225

    ben225 New Member

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    car also running very rich
     
    ben225, Jul 25, 2024
    #57
  18. BEN225

    ben225 New Member

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    Done all checks and timing done, everything looks good.... except I noticed the thermo time switch for cold start system was unplugged. The brown plug i believe it should have was plugged into the WUR. Therefore i'm missing the plug for the WUR, ive found the wires and now awaiting for a new 2 pin connector to arrive.

    Just wondering with WUR unplugged could this be causing my engine to run rich?
     
    ben225, Jul 26, 2024
    #58
  19. rubjonny

    rubjonny Administrator Staff Member Admin

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    it could run a little rich during warm up, but eventually engine heat will do the job of getting it to normal running mixture
     
    rubjonny, Jul 26, 2024
    #59
    ben225 likes this.
  20. BEN225

    ben225 New Member

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    perfect thank you, I think having the thermo time switch unplugged could have caused some richness?

    Also to double check, whilst i wait on my plug arriving in the post can i still drive with WUR disconnected? Engine seems happy enough only on cold start is it a bit spluttery
     
    ben225, Jul 26, 2024
    #60
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