Click here to sign up  Click here to go to the galleries  Click here to go to the code of conduct  Click here to go to the video page  Click here to go to the SW Meets page

Thread: Cabrio carb

Page 1 of 5 1 2 3 ... LastLast
Results 1 to 10 of 45
  1. #1 Cabrio carb 
    frequent forum contributor
    Join Date
    Feb 2013
    Location
    Kidwelly Carmarthenshire
    Posts
    55
    I hv a Ford 2ltr Dohc carburettor engine which is not ticking over very well, its hunting to a point of stalling. The Carburetor is a 2v tldm. I have taken the following steps to try and fix this....
    1).* Replaced the inlet manifold gasket.
    2).* Checked the electric fuel pump by disconnecting the pipe from the carburetor.
    3).* Taking the carburetor apart and cleaning using compressed air and replacing the various gaskets and diaphragms.
    4).* Checking the vacuum where vacuum connections are, manifold, brake servo, engine and carburetor.
    5).* Replaced the spark plugs.
    6).* The insulation block was also checked for cracks.
    7).* New gaskets used either side of the insulation block
    The engine has only completed 76000 miles.
    Lastly having carried out the work the mixture screw does nothing, screw it in or out makes no difference to the tick over, it remains hunting.
    Out on the road under load it accelerates really well but will not tick over but remains hunting.
    Can anyone help me please.
    Reply With Quote  
     

  2. #2 Re: Cabrio carb 
    Moderator Club Member
    Join Date
    Nov 2011
    Location
    Derby
    Posts
    1,394
    Are you sure that the carb's float valve isn't sticking causing it to flood?
    Reply With Quote  
     

  3. #3 Re: Cabrio carb 
    frequent forum contributor Club Member greyV8pete's Avatar
    Join Date
    Nov 2011
    Location
    Exeter
    Posts
    1,215
    Check and clean the EGR valve / crankcase breather system? Also as per above, check that the float isn't holed and sinking. Remove it and give it a shake. You will hear any fuel sloshing around inside if it is holed. Peter.
    Last edited by greyV8pete; 15-03-2020 at 11:32 AM.
    Reply With Quote  
     

  4. #4 Re: Cabrio carb 
    frequent forum contributor
    Join Date
    Feb 2013
    Location
    Kidwelly Carmarthenshire
    Posts
    55
    Hi,
    Thank you for your replies both of the suggestions were part of carburetor cleaning nothing wrong there.
    Reply With Quote  
     

  5. #5 Re: Cabrio carb 
    frequent forum contributor Club Member greyV8pete's Avatar
    Join Date
    Nov 2011
    Location
    Exeter
    Posts
    1,215
    Check wiring connections to and serviceability of the idle cut off valve. If thats failed the idle valve will stay shut. Usually wont run below a fast tickover but may just cause your symptoms if the carb is set rich enough. Peter.

    If you need parts Gower & Lee are very helpful:

    http://www.gowerlee.dircon.co.uk/TLDMtype.html
    Reply With Quote  
     

  6. #6 Re: Cabrio carb 
    frequent forum contributor
    Join Date
    Feb 2013
    Location
    Kidwelly Carmarthenshire
    Posts
    55
    Hi Peter,
    The wiring was also checked. Cut off valve is functioning correctly.
    Reply With Quote  
     

  7. #7 Re: Cabrio carb 
    frequent forum contributor Club Member greyV8pete's Avatar
    Join Date
    Nov 2011
    Location
    Exeter
    Posts
    1,215
    And is the 12v supply from the ignition switch ok too? Clutching at straws here. Peter.
    Reply With Quote  
     

  8. #8 Re: Cabrio carb 
    frequent forum contributor
    Join Date
    Feb 2013
    Location
    Kidwelly Carmarthenshire
    Posts
    55
    Hi Peter,
    Yes the electrical system is fine. I appreciate your help.
    I am at a loss as to what to next, a new carburetor I suspect.
    Reply With Quote  
     

  9. #9 Re: Cabrio carb 
    frequent forum contributor Club Member greyV8pete's Avatar
    Join Date
    Nov 2011
    Location
    Exeter
    Posts
    1,215
    A carb wouldn't suddenly fail unless ...... I fitted a recon exchange carb for my classic once and during a club tour in France it had the same symptoms at yours. The idle jet had a speck of dirt in it which kept making it idle poorly and backfire on overrun, a classic weak mixture symptom. So as I had already cleaned the idle jet I assumed (incorrectly) that it couldn't be the same problem so in Castellane, suspecting an air leak, I fitted a new inlet manifold gasket in a car park, much to the entertainment of the locals. Fine for 20 miles and then a recurrence of the fault. The actual cause was again a blocked idle jet! The reason was that the recon carb had only been stripped to replace the usual parts, jets spindle bearing etc. The blockage was caused by small specks of scale that were flaking off the walls of the drilled fuel ways in the carb body that supplied fuel to the jets. Through having stood on a shelf for a while and then being subjected to the heat of a lot of mountain passes in the south of France the scale started to fall off. The idle jet being the smallest became blocked, whereas the main jets being huge in an old classic were ok.

    Soo initially remove all the jets and give it a good blast through with a high pressure air line. If that doesn't do the trick I would look for somewhere that has ultrasonic cleaning equipment. Its used to clean fuel injectors on moderns so search for them first. Ideally you need to carefully drill out any small lead plugs so you can look right down the fuel ways. Of course you need to use a flat ended punch to fit new lead balls afterwards. Hope this is helpful. Peter.
    Reply With Quote  
     

  10. #10 Re: Cabrio carb 
    Moderator Club Member
    Join Date
    Nov 2011
    Location
    Derby
    Posts
    1,394
    Seal /gasket between servo and brake master cylinder. Sometimes gets left out when working in this area and will cause poor running.
    Had you being working on the vehicle prior to the problem and if so on what?
    Like Peter I also experienced partial idle jet blockage on Cortina GT years ago. Took me ages to find and was the remains of a small insect causing all the issues
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •