I just purchased a Jayco Seismic TH from camping world in Dec. of 2014. The trailers has a factory installed Onan 5500 (model # 5.5HGJAB-6755K. When trying to start it for a maintenance run, I somehow flooded it. Proabably over primed it. I was finally able to get the thing started and it sputtered and blew black gunk out of the tail pipe.
Once it was cleared itself, it began running just fine. Maintains constant throttle, no loud noises....nothing. Howeever, it will run for about 10 to 15 minutes on the initial start-up, then stops itself. Throws error code of 58 which is high exhaust gas temp. Looked in service manual, and it says to take to dealer.
Not wanting to down my trailer at the dealership for a month, I called Camping World for tech support. They were nice and courteous, but could not answer my question. Said he would have to call Cummins. I tried calling Cummins too, but was told they will absolutely not give tech support over the phone. Go figure! A customer wants to troubleshoot before bringing item in for warranty issue, and no help! No customer appreciation now days!!
I've looked at other forums and finding no help. Seen everything from bad magneto, to varnishing of carb, etc. My unit runs great before the exhaust heating up and throwing code 58.....every time. Under load and not under load. Engine is clean as a whistle and brand new (2015 trailer). Has 22 hours on it. Gas is clean.
I've taken the spark arrestor out and ran the unit as per service requirements. It still cuts off. Did not blow much of anything out of the spark arrestor hole.
I'm at a loss. Any idea would be appreciated.
Thank you
