dsoly 2 #1 Posted May 16, 2016 Hi all, I have a 416-8 with an Onan. This tractor is driving me nuts. Starts and runs excellent, but randomly stalls. No surging no loss of lights or charging , nothing. But it starts right back up every time. I've changed fuel pump,filter, fuel line, new fuse block and did the battery wire mod on the 9 pin connector. It's totally got me stumped. I've also bypassed seat switch. Share this post Link to post Share on other sites
daveoman1966 3,841 #2 Posted May 16, 2016 What you describe is how a bad condenser would act. When cold, the condenser is ok, but when it gets up to engine temp, it begins to fail....resulting in no engine spark. Now, I don't know if the Onan engines have the condenser like a Kohler has, but it is just a thought. Dave 2 Share this post Link to post Share on other sites
cleat 7,263 #3 Posted May 16, 2016 For some reason the Onan uses the condenser on the positive side. Unsure how this could work, but I guess Onan engineers deemed it so. My 416 would sometimes backfire when I turned the key on with a hot engine before actually cranking it. I replaced the condenser and that stopped so I guess that is what it is for. I would go through all the wiring, seat switch, PTO switches, ignition switch, 9 pin connector etc and make sure everything is tight and the connectors look good and clean. I wonder if a bad ignition switch would do this and when you touch it to restart, it regains connection for a while. If it were running out of fuel, the filter would be empty. That is how I found one of my 520's had a bad pump. Share this post Link to post Share on other sites
dsoly 2 #4 Posted May 16, 2016 Thanks guys! Gonna tear into it next couple of days and see what I can find. Share this post Link to post Share on other sites
boomers_influence 106 #5 Posted May 16, 2016 dsoly you do not state which onan engine you have?? P series condenser hooked to the + side of the coil. electronic ign. ( it IS NOT needed to run ) B series condenser hooked to the _ side of the coil, but usually inside the point box. it is needed. boomers_influence@yahoo.com thank you. boomer ( the used onan engine parts guy, also NOS and new ) 1 Share this post Link to post Share on other sites
dsoly 2 #6 Posted May 17, 2016 It's a p216. I changed key switch, now it starts as soon as I'm in run position. Thanks boomer I have a 315 classic, raider 14, 416-h, with a transplanted p220, and a 417-8. Boomer , all of these tractors have been great, Onans, and kohlers. But this one is giving me fits. Thinking its needing the engine pulled off and everything gone through Share this post Link to post Share on other sites
kayvonmansouri 10 #7 Posted August 26, 2016 Just for anyone else that might come across this, Mine was doing something similar, and i trouble shot it to the seat safety switch. Share this post Link to post Share on other sites
