AllenWConrad Posted June 5, 2021 Share Posted June 5, 2021 Just got a cooling issue in my 1923 Chevy supreme fixed. Now it backfires and spits while driving down the road. Can someone put me in the right direction to solve this issue. Link to comment Share on other sites More sharing options...
BearsFan315 Posted June 5, 2021 Share Posted June 5, 2021 (edited) beautiful car... and as a Chevrolet Owner 1929 & 1930 i live over on VCCA, they are the GURUS and can solve most any issue, i would post your issue 1921-1928 Forum does it do so while idling, or only under load ?? I would start by making sure the timing is on, check point gap, spark gap, valve settings, set all cold then go from there. even if you have NOT touched it since it ran last. that is where i start. May also want to make sure carb is not clogged or gummed up !! may be starving for fuel or float stuck. updrafts are picky My 1930 was having a slight miss, and i had to tweak the timing a degree or two and now runs smooth again. they are simple machines but still peculiar 😛 Edited June 6, 2021 by BearsFan315 (see edit history) 2 Link to comment Share on other sites More sharing options...
BearsFan315 Posted June 5, 2021 Share Posted June 5, 2021 (edited) FYI it is a Chevrolet Superior aka Series B not Supreme Edited June 5, 2021 by BearsFan315 (see edit history) 1 Link to comment Share on other sites More sharing options...
nickelroadster Posted June 5, 2021 Share Posted June 5, 2021 (edited) It is probably trying to tell you that it is running too lean. Are you running gas with alcohol? A fix may be nothing more than to start using alcohol free gas. How did you fix the cooling issue? Edited June 5, 2021 by nickelroadster (see edit history) Link to comment Share on other sites More sharing options...
Dave39MD Posted June 5, 2021 Share Posted June 5, 2021 As a test you might try easing the choke out a small amount when it is running rough. If that cures it running lean is at least one of the problems, find out what is causing the condition. Dave Link to comment Share on other sites More sharing options...
Flivverking Posted June 6, 2021 Share Posted June 6, 2021 Is this backfire a bang explosion out the exhaust pipe or is it a loud snapping popping, blow back out the carburetor? Link to comment Share on other sites More sharing options...
Flivverking Posted June 6, 2021 Share Posted June 6, 2021 Worse case after simple common reasons are eliminated ,look toward burnt exhaust valves! one or all.. Link to comment Share on other sites More sharing options...
AzBob Posted June 6, 2021 Share Posted June 6, 2021 If it has a vacuum tank, is the vacuum tank pulling gas from the gas tank and cycling properly? If it is malfunctioning, a vacuum leak here would cause similar problems. Link to comment Share on other sites More sharing options...
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