Section : Engine

Carbon Coated Spark Plug

Posted By : Peter Churchill, 11-Jul-2006, 02:43pm

• Carbon Coated Spark Plug

  Posted By : George Ralph, 11-Jul-2006, 03:42pm

  Bit difficult to say (although some of the gurus on the site will probably know), without knowing: what carb set-up you have, standard 1973 emmision strombergs? What is the condition of the carbs? Which air filters are fitted? And which plug is sooting up? Do you have a brake servo fitted, if so where's the take off? It sounds like you are a bit rich on one cylinder and it is isn't possible to adjust individual cylinders. The standard set up has one carb per group of three cylinders and the GT6 inlet manifold is not that well balanced so it is always going to be a compromise. Check out these things. Oh, and one last thing, if you are using Champion plugs, chuck them in the bin and get some NGKs.
  
  To be honest it's never a good idea to fiddle with it if it's running fine ("if it ain't broke , don't fix it"). First off I would give it all a good check over and install some NGKs and try like that for a while.

  • Carbon Coated Spark Plug

    Posted By : David Beer, 12-Jul-2006, 05:51pm

    Hi Peter,
    
    I have had a similar sounding problem but on several of the plugs. Finally traced it down to poor ignition firing, which was solved by replacing the points and the main HT lead from the Coil to the distributor. As one lead has been changed I am now replacing them all.
    
    As you only have a problem with one Spark Plug it's possible that the HT lead to the spark plug isn't transferring enough power to give a big enough spark.
    
    

    • Carbon Coated Spark Plug

      Posted By : Peter Churchill, 15-Jul-2006, 12:22pm

      Many thanks George, I do have Champions on the car and I will now try NGKs. As you said, if ain't broke, don't fix it ! So I will start with the eay stuff first ...will post a note to say how I'm getting on.
      
      David, also many thanks I will take acloser look at the ignition.
      
      Peter