Generator Question - Propane Onan Suddenly Misfiring......

[RBAJJK]

Team,

Ok, I have an Onan Propane Generator, 6KW I believe. Anyway, we just got back from a trip this week to Flagler Beach, FL - just South of St Augustine (East Coast of FL) - State RV Park right on the beach (highly recommended). Anyway, dash A/C has been out for a while. We travelled 4.5 hrs there using the generator so we had A/C - no problem. We travelled 4.5 hrs back using the generator (a week later) - no problem.

However a day later (today), I finished de-sanding the RV and general clean up. Went to take it back to its storage spot, started the engine and the generator - as I did earlier. The generator starting but then started these loud popping noises.... backfiring (I think). It would run but pop loudly every two to three seconds and would never accept a load on the engine strong enough to put out any power. As I inspected the engine, when it would make this pop, I would feel air coming out from the air filter intake.

I did change the plugs and oil a couple of weeks ago. So I know it has plenty of oil and new plugs. I have not yet pulled the plugs to see if they are fouled so much to impact firing, but like I said ran like a dream yesterday for almost 5 hours.

Any ideas??????????????

Any suggestions on where I can get good info on troubleshooting. By the way this is a 1996 Gulfstream Scenic Cruiser with only about 450 hrs on it.

Thanks as always.

Brian Kelly

[RBAJJK]

Sorry, this is a Generac NP-66G, not Onan...............duh.