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Onan 18hp B48M-GA018 engine
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Posted by fletcher on June 07, 2005 at 22:04:26 from (206.62.11.5):
Hello, I have a Case/Ingersoll garden tractor with a 18 hp Onan engine. The engine is hesitating/misfireing during idle and open throttle operations. This condition is noticeable from near start-up and get worse under longer operating periods. At first it would take 20 to 30 minutes for the misfireing to start, followed by back fireing. I have replaced the ignition coil with two different used coils but still have the same problem. The engine has 544 hrs on it with the original points and condenser installed. I replaced the plugs last fall when I was having this problem but I am not sure if I set the plug gap. I think maybe I can rule out an ingition coil problem. That leaves a condenser, points, or plug gap problem! If anyone has an more insight or comments on this problem, I would like to get your thoughts! Thanks, Dan
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