allinger Posted November 13, 2012 Share Posted November 13, 2012 To the point - '74 Series runs fine while cold. Then after a stop (or after getting warm) it sort of loses momentum. To the point where I have to revv it hard to keep all 4 fireing. At, for instance, a stoplight... And once it drops, it drops to two or at best, three cylinders. Then, as it gets revved up in first gear (clutch out) it sort of kicks in. Until it doesn't... Now, I'm starting to work through the fuel-electricity-air equation and so far I've: - Rebuilt the carb. With proper Zenith parts - Gone from points to electrical breaker - Gone from mechanical to electrical fuel pump - New coil, contacts and wires - Cleaned the air filter and replaced the oil - Replaced all the hose clamps to all the pipes. All of them... And still it's giving me this "#¤&¤%/&/. I'm at the end of my wire here! What's next? Plugs? Plug wires? Firebomb? Any and all input appreciated! Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted November 13, 2012 Share Posted November 13, 2012 Is it fuel vaporisation in the line/carb? I know some carbs can suffer this - my Holley did. Quote Link to comment Share on other sites More sharing options...
allinger Posted November 13, 2012 Author Share Posted November 13, 2012 To quote Mr Manuel, of Fawlty Towers fame - "I know naathin!" How would one go about checking fuel vaporisation? Quote Link to comment Share on other sites More sharing options...
blatherskite Posted January 1, 2013 Share Posted January 1, 2013 <blockquote class='ipsBlockquote'data-author="allinger" data-cid="683021" data-time="1352811746"><p> To quote Mr Manuel, of Fawlty Towers fame - "I know naathin!" How would one go about checking fuel vaporisation?</p></blockquote> Could be fuel vaporisatipn as it passes through under the bonnet; maybe your pump is tired & isn't shifting the fuel like it should, or the filter gauze is plugged or maybe damaged diaphragm? Test by taking fuel line off at carb & cranking the engine over. Catch the fuel in a can, and ideally make sure the dizzy isnt sparking! Quote Link to comment Share on other sites More sharing options...
dave88sw Posted January 2, 2013 Share Posted January 2, 2013 I would put money on the plugs breaking down as they get hot. for the cost of them, id stick a set in to try, they are a service item anyway. Quote Link to comment Share on other sites More sharing options...
Tanuki Posted January 3, 2013 Share Posted January 3, 2013 When you get the wobbly issues, feel the coil. If it's hot - worry. You may have a ballast-resistor-type coil fitted but the ballast-resistor may be shorted/bypassed-by-a-previous-owner. Equally - replace the condensor in the distributor: if this is breaking down it will play havoc with the spark and make starting a ++ pain-in-the-sphincter. Quote Link to comment Share on other sites More sharing options...
santalars Posted January 4, 2013 Share Posted January 4, 2013 sounds like electrical / spraking problem to me too. I would try new plugs and leads after you have confirmed that you are using the right coil type. Quote Link to comment Share on other sites More sharing options...
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