Exhaust system for mk1 caddy 1.8l 16v

Discussion in 'Mk1' started by _E_, Jun 14, 2022.

  1. rubjonny

    rubjonny Administrator Staff Member Admin

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    I believe so actually, IIRC the original one was replaced by the 9a one which has an extra outlet you block off with a bung. on that note, a 9a boot will work on a KR if you block the extra outlet with a bung :lol:
     
  2. _E_

    _E_ Forum Member

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    Hi RJ

    Just wanted to thank you for all your help over what feels like a eternity lol.

    Just outside the mot station.

    Thanks
     
  3. rubjonny

    rubjonny Administrator Staff Member Admin

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    no problem, let us know if it passed :thumbup:
     
  4. _E_

    _E_ Forum Member

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    All passed.

    Just need to tweek the injectors i think.

    Thanks mate
     
  5. rubjonny

    rubjonny Administrator Staff Member Admin

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    great news :)
     
  6. _E_

    _E_ Forum Member

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  7. _E_

    _E_ Forum Member

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    Hi RJ,

    I hope you are well.

    I've taken the caddy out a good couple of times now. When the engine is cold and warming up, runs and idles good. When the engine gets to temperature pulling up to junctions and lights it will cut out when it trys to idle. Any ideas?? I guess the isv is working as its fine when cold.

    Thanks
     
  8. rubjonny

    rubjonny Administrator Staff Member Admin

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    first thing I'd check idle switch is making good strong contact when throttle closes, the upper linkage can get sticky or jam if its dirty or the return spring has been pinched when reassembling. once thats been checked over double check the base idle is good. to confirm idle switch probe the black/yellow wire at isv module, it should have ignition live. check this on a cold and hot engine as well in case something is expanding with heat or whatever
     
  9. _E_

    _E_ Forum Member

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    Ok will check wiring, the throttle is nice and free to activate isv switch. If that's all OK , could it be air fuel mixtures not right? As when cold it uses 5th injector.

    Have you got any tips on adjusting the injectors?

    Thanks
     
  10. rubjonny

    rubjonny Administrator Staff Member Admin

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    the 5th injector is only fired while cranking over or hard throttle input when engine is stone cold, so it wont be down to that
     
  11. rubjonny

    rubjonny Administrator Staff Member Admin

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    could be the warm up regulator though, but you need pressure gauges to test that
     
  12. _E_

    _E_ Forum Member

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    The wur is extremely old, all I've done is a resistance test. If it is wur could I just get a repair kit off ebay?
     
  13. rubjonny

    rubjonny Administrator Staff Member Admin

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  14. _E_

    _E_ Forum Member

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    Hi RJ,

    I've ordered the below kit for the WUR.

    Once I have rechecked the resistance, is there anything else I need to look out for to spot to determine whether its been working correctly?

    Thanks Screenshot_20230221-080815_eBay.jpg
     
  15. rubjonny

    rubjonny Administrator Staff Member Admin

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    just anything obvious really, its pretty simple bimetalic strip with extra heater to help it warm up as well as it using engine heat
     
  16. _E_

    _E_ Forum Member

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    Ok thanks mate
     
  17. _E_

    _E_ Forum Member

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    Hi RJ,

    Just a quick question, if the wur was not functioning properly, would that effect the fuel flow through the injectors when testing with relay swapped for testing purposes?

    Or is it only active when the engine is running?

    Thanks
     
  18. rubjonny

    rubjonny Administrator Staff Member Admin

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    what the wur does is adjust the control pressure inside the metering head, in a nutshell this changes how much the air flap can move the pin inside the fuel metering head for any given flow of air

    so if it failed it would mess up how much fuel is injected either all or some of the time depending on the state of it. it couldnt block fuel flow out of the injectors altogether as even when closed off entirely the injectors can still spray but obv this would mean the fuel delivery would be totally messed up
     
  19. _E_

    _E_ Forum Member

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    Thanks mate, will get on rebuilding the wur.
     
  20. _E_

    _E_ Forum Member

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    Hi mate, hope you are well.

    I'm in the process of sorting my horn out.

    I've put the spacer so the horn isn't constantly on so I know the horn works.

    I wired up the switch and nothing happens.

    Sorry this might sound dumb, when I bridge the spade connector for the switch to the body earth the horn sounds. But nothing happens when plugged into the switch.

    Am I missing something stupid?

    Thanks
     

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