Onan 18hp B48M-GA018 engine

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

Follow Ups:

• Re: Onan 18hp B48M-GA018 engine Giles 16:09:41 01/16/06 (0)
• Re: Onan 18hp B48M-GA018 engine chris sweetland 19:29:55 06/10/05 (0)
• Re: Onan 18hp B48M-GA018 engine Big Bo 09:06:36 06/08/05 (0)
• Re: Onan 18hp B48M-GA018 engine old 08:11:09 06/08/05 (0)
• Re: Onan 18hp B48M-GA018 engine hlc 04:07:37 06/08/05 (0)

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