Pete Lewis Posted August 1, 2023 Report Share Posted August 1, 2023 its looking more like rotor dizzy cap , i cant dream up why up a ramp would create this misfire its the joys of classics Pete Link to comment Share on other sites More sharing options...
foshi Posted August 1, 2023 Author Report Share Posted August 1, 2023 hi 49 minutes ago, Iain T said: Surely it can't be a carb or fuel problem as with a single carb all four cylinders would be effected. It must, and I use that word cautiously, be an electrical fault on 3 and 4 only. Try swapping leads and plugs? Iain been on it a couple of hours now swapped leads around changed leads cleaned plugs swopped around cleaned points swopped coil for a known one , has no ballast running a 12v coil so i thought would try and bypass the ignition switch in doing so the engine starts fine but shuts off dead after a few seconds , so back to running from switch ,if left running for around 15 min the engine will just shut off dead got to be electrical my thinking but what. does take a couple of cranks to start again though , thinking as you said can not be carb what next though , just to add engine does not overheat starts on the button from cold little choke although only running on 2 pots Link to comment Share on other sites More sharing options...
Iain T Posted August 1, 2023 Report Share Posted August 1, 2023 I had a dodgy spade connection on my coil that caused a lot of head scratching before I tracked it down. It looked fine it was a bit loose on the male so I cleaned it up and tweaked it with some pliers and to date it's been fine........🤞 However why only the back two cylinders but worth checking. Iain Link to comment Share on other sites More sharing options...
trigolf Posted August 1, 2023 Report Share Posted August 1, 2023 Am I right in thinking that in the early days of alternators you had to disconnect the alternator when welding to avoid damage to the diodes in it? Or is it dynamo fitted? Just a thought. Link to comment Share on other sites More sharing options...
foshi Posted August 1, 2023 Author Report Share Posted August 1, 2023 17 minutes ago, trigolf said: Am I right in thinking that in the early days of alternators you had to disconnect the alternator when welding to avoid damage to the diodes in it? Or is it dynamo fitted? Just a thought. i always where possible disconnect the battery , working fine Link to comment Share on other sites More sharing options...
foshi Posted August 1, 2023 Author Report Share Posted August 1, 2023 my thoughts are let it run the when it shuts off disconnect the fuel pipe from the carb and pump ,if it then firs up at least i can eliminate fuel flow as the problem although sure its not fuel related now Link to comment Share on other sites More sharing options...
trigolf Posted August 1, 2023 Report Share Posted August 1, 2023 Another what if thought... Have you replaced the condenser to eliminate it? Link to comment Share on other sites More sharing options...
foshi Posted August 1, 2023 Author Report Share Posted August 1, 2023 (edited) first thing i tried i dont want to start swopping parts as some of the new stuff has problems ,so using my stash of used where i can , hoping someone will come up with a answer as running out of ideas ,makes no sense goes up ramps like a rocket then after a week runs like a bag of nails paul Edited August 1, 2023 by foshi Link to comment Share on other sites More sharing options...
foshi Posted August 2, 2023 Author Report Share Posted August 2, 2023 success went out this mourning usually starts on the button not today though turning like the timing was out strange, ok last night , so went through my pile of old spares found a complete dizzi took the rotor arm out swopped it with the new red type i fitted yesterday she fired straight up running great, now to get rid paul Link to comment Share on other sites More sharing options...
foshi Posted August 2, 2023 Author Report Share Posted August 2, 2023 (edited) just to add spot on again pete same as you no idea why going on the ramp and off could cause the problem still the carbs had a good clean now , still learning after 50 years messing with cars paul Edited August 2, 2023 by foshi Link to comment Share on other sites More sharing options...
johny Posted August 2, 2023 Report Share Posted August 2, 2023 And how a rotor arm can affect just cylinders 3 and 4 is incredible but such is life🤪 Link to comment Share on other sites More sharing options...
foshi Posted August 2, 2023 Author Report Share Posted August 2, 2023 48 minutes ago, johny said: And how a rotor arm can affect just cylinders 3 and 4 is incredible but such is life🤪 no idea all i know its running fine, not even tempted to fit the old one back just to see in case it all goes wrong again pauil Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 2, 2023 Report Share Posted August 2, 2023 just love the simple fix but the headache of getting there can be very painful Pete Link to comment Share on other sites More sharing options...
foshi Posted August 2, 2023 Author Report Share Posted August 2, 2023 2 hours ago, Pete Lewis said: just love the simple fix but the headache of getting there can be very painful Pete just got back from him tacking the car only for it to cut out 4 miles down the road my heart sank , time i got to him car was running again the idiot i am only put the coil wires back the wrong way round quick swop and he reported drove him 20 miles home no problems . Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 2, 2023 Report Share Posted August 2, 2023 we have enough coils back to front without you testing that it doesnt work Ha! Pete Link to comment Share on other sites More sharing options...
daverclasper Posted August 4, 2023 Report Share Posted August 4, 2023 On 01/08/2023 at 14:39, Iain T said: Surely it can't be a carb or fuel problem as with a single carb all four cylinders would be effected. It must, and I use that word cautiously, be an electrical fault on 3 and 4 only. Try swapping leads and plugs? Not the case here, though inlet manifold could have leaks?, affecting individual cylinders? Link to comment Share on other sites More sharing options...
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