flattiefreak Posted February 2, 2009 Report Posted February 2, 2009 hey guys. i have solved a problem on my 58 plymouths 230 flattie and another one arises. it has been completely rebuilt in summer of 2008. i have only driven it about 20 miles all together. i do let her idle nearly everyday. now that i have solved the brake issue the car goes in both directions without stalling. but everytime i let the engine run a little while, ill turn off the engine and ill get one loud pop. its coming from the exhaust pipe. does this sound like an exhaust leak or timing? im not good at troubleshooting. Quote
Niel Hoback Posted February 2, 2009 Report Posted February 2, 2009 It sounds like you may be getting raw gas in your exhaust, running too rich? Too high an idle speed? Quote
flattiefreak Posted February 2, 2009 Author Report Posted February 2, 2009 i think it may be running lean. ill have to check the carb Quote
Niel Hoback Posted February 2, 2009 Report Posted February 2, 2009 If its running lean, it will backfire through the carb, and gas would not be running raw into the exhaust. Quote
Don Coatney Posted February 2, 2009 Report Posted February 2, 2009 You are running rich and you have an exhaust leak near the manifold. The exhaust leak allows fresh air to enter the exhaust system and ignite the unburned fuel. You should hear my Briggs and Stratton lawn mower pop about 10 seconds after I shut it off. Scares the hell out of my wife:D Quote
flattiefreak Posted February 2, 2009 Author Report Posted February 2, 2009 You are running rich and you have an exhaust leak near the manifold. The exhaust leak allows fresh air to enter the exhaust system and ignite the unburned fuel. You should hear my Briggs and Stratton lawn mower pop about 10 seconds after I shut it off. Scares the hell out of my wife:D yes, mine is just like that. a few seconds after i shut the engine off i get a loud pop like a gunshot. Quote
flattiefreak Posted February 2, 2009 Author Report Posted February 2, 2009 i should also mention that it will not pop if i only run the engine briefly (3 minutes or so) Quote
Norm's Coupe Posted February 2, 2009 Report Posted February 2, 2009 Doesn't matter how long you run the car. It's still one of the problems mentioned. Quote
flattiefreak Posted February 8, 2009 Author Report Posted February 8, 2009 i know that i should turn the rich lean screw in to lean out the carb but how far in? Quote
Norm's Coupe Posted February 8, 2009 Report Posted February 8, 2009 Who knows where that set screw is set right now. The best way to do it is to start from scratch. Turn the screw all the way in, then immediately turn it about 1 1/2 turns out. Then start the car up, let it warm to operating temperature and finish adjusting the mixture. Don't forget, you may have to also slow down or speed up the accelerator adjustment too. Again, start at the bottom then turn 1 1/2 turns out prior to starting the engine. Quote
flattiefreak Posted February 9, 2009 Author Report Posted February 9, 2009 i adjusted the carb and there are no longer backfires. thanks for the advice. Quote
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