misfire then breakdown

Tips and help requests for your cars mechanics. points gaps, timming settings all those sorts of things

Re: misfire then breakdown

Postby hbr341 » Sat Feb 20, 2021 6:54 pm

Hi All
I have got the viva out and fully warmed up sure enough after 35mins running seamed to misfire and cut out but did start up straight away but running a bit uneven so i checked the voltage at the coil I got 13v-13.5v at the ballast and 11volts after the ballast and 10v coil to points this is with the engine at tick over. I think the next thing will be to book the car in for a rolling road test as I have no Idea I think I have done all I can.

Regards Chris.
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Re: misfire then breakdown

Postby droopsnoot » Sat Feb 20, 2021 7:10 pm

Isn't that quite high for the figure after the ballast? I thought it was supposed to drop further than that, but then I'm only thinking of HC, which might be different.
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Re: misfire then breakdown

Postby Johnboy HB » Sat Feb 20, 2021 7:21 pm

Could be fuel evaporation, or maybe valve clearances too close, but that would have been ruled out as rizzo says by compression test hot
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Re: misfire then breakdown

Postby hbr341 » Sun Feb 21, 2021 6:59 pm

Hi
Thanks for your replies Its not fuel evaporation last summer I thought it was so I fitted a plate under the carb and it keeps the carb cool tomorrow night i will check the valve clearances Thanks

Regards Chris.
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