PCMatters
New member
I have an Onan QD 7500, almost 3000 hrs. I normally can't start it without pressing and holding the Aux By-Pass button because the batts get too run down (it's not connected properly to the the main engine - it starts fine NP no matter how run down the coach batts get). But it does start right up and runs without issues 95% of the time. Sometimes, after being off for hrs, starting it in the morning, it runs for a min or two and dies - does this 3 times in a row - then it runs fine for 100's of hrs. It doesn't blow any blue/black smoke (I saw it do it once for a few seconds right after I started it). Today it stopped running after being on or 20+hrs and I got an error code 17 (first time it ever just died that wasn't because I ran out of fuel or just starting up like mentioned) and I'd just filled the tanks last night so that wasn't the reason. Code 17 isn't listed anywhere and, after I pressed stop for a bit, it started right up and has been fine since. Just now, 14 hrs later, it died again. I checked the red light and it's 17 again. This time it wouldn't start and stay running. It'd start then die a few secs later. It did that 4 or 5 times. Again, when I pressed "Stop" (to prime it I guess) it didn't work until I reset the breaker and then hit Stop, then it started and has been running again for hrs. This morning when I checked under the hood, the oil fill & coolant caps weren't twisted shut/tight and the passenger side front of the genny has rusted so much so that I feel wind blowing through the rust. I got my roll of 5 inch Gorilla tape and sealed it all the way around. I've been changing the oil pretty consistently. It's due for another. I changed the fuel filter too - however I've not located a air filter yet (I didn't realize the part numbers were right on the unit - was having trouble finding the parts) I"m going to go on Amazon and Ebay - they have quality parts pretty cheap, order a bunch of kits. I also wonder how important cleaning the spark arrester is. WHY CAN'T I FIND ERROR CODE 17 AND WHY WOULD IT BE INTERMITTENT? CAN ANYONE HELP? THANKS, Vince