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Thread: Cabrio carb

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  1. #21 Re: Cabrio carb 
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    Probably not relevant to the carb version but I had an idling and hunting problem with my DOHC Efi engine and I assumed it was the idle control valve. Took it off and cleaned, no difference. Replaced it with a new one and again no difference. Based on a tip I changed the throttle position sensor and the problem was solved. No idea if the carb on the later engines with an ECU had a similar device.
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  2. #22 Re: Cabrio carb 
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    I'm just repeating what I've read so apologies if info is incorrect. You have the engine , I do not.
    Still like to know if car was in regular use or not etc etc
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  3. #23 Re: Cabrio carb 
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    If you play around with the idle speed screw to the extent that the throttle flap is moved beyond the idle circuit [ie uncovering the progression hole] then adjusting the mixture screw will have no effect whatsoever. Throttle flap needs to be shut for mixture to be adjusted then idle speed screw adjusted if necessary.
    Sorry if that sounds like I'm trying to teach my Granny to suck eggs!
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  4. #24 Re: Cabrio carb 
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    Hi,
    No throttle position sensor on the carburetor.
    I have tried gravity feeding the carburetor and that hasn't had any effect.
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  5. #25 Re: Cabrio carb 
    frequent forum contributor Club Member greyV8pete's Avatar
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    I still don't understand, has this hunting / idling always been a problem and just got worse, or has it reared its head suddenly and if so when? Peter.
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  6. #26 Re: Cabrio carb 
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    I've asked the same question Peter, but no answer so far!
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  7. #27 Re: Cabrio carb 
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    Hi,
    This problem has been with me for the last few months. Gradually getting worse over the period.
    I'm as frustrated as yourselves.
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  8. #28 Re: Cabrio carb 
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    Could the timing be slightly out?
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  9. #29 Re: Cabrio carb 
    frequent forum contributor Club Member greyV8pete's Avatar
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    Quote Originally Posted by Mickaleen View Post
    Hi,
    This problem has been with me for the last few months. Gradually getting worse over the period.
    I'm as frustrated as yourselves.
    Ah that narrows it down a bit! To me gradually worsens equates to gradually failing or wearing out. So being convinced that it is over fuelling at tickover I would then suspect the following.


    Diaphragms - Done
    Gaskets leak - Done
    Jets esp idle - ???
    Worn throttle spindle - ???
    Needle valve - ???


    If the throttle spindle is badly worn then so much air is going in that the mixture screw cannot compensate. A refurb / replacement is then required.


    However if the spindle is ok then I would put my money on the needle valve. Get a replacement viton tipped needle and new jet. Reset the correct fuel level and see what happens.


    A final thought is to check that the fuel pump is correct delivery pressure for that carb. I would expect 3-4 psi max to be sufficient for a 2L engine. Peter.
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  10. #30 Re: Cabrio carb 
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    Hi Peter,
    I am unable to check the delivery pressure so I ordered an after market fuel pump which I should have by Friday or Monday the latest. Webcon also suggested I check the delivery pressure they suggested 2 psi at least.
    The pump I have ordered is a universal one off ebay. Will hopefully know if it's successful once set up.
    There has to be some wear the carburetor is getting on a bit, 25 year old. ( a bit like myself).
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