Onan 5500 Backfires and Dies under a load
Good Morning.. Im hoping to find the Onan guru's that are here... For the past year I have been searching for answers and replacing parts with no improvement. I have an Onan 5500 with less than 100...
Forum Discussion
seafoam doesn't fix problems
Seafoam contains kerosene, which is paraffin, which we all know as wax
Anything more than the recommended dose and it will cause more problems.
I doubt it's tight valve lash IF it ran fine for the first 100 hours
You replaced both spark plugs and then you replaced another because it wasn't firing?
Was the porcelain black?
If so you may have a running rich issue.
Can you see that the choke plate is fully open when hot?
Could be a spark plug wire
Need more info
Seafoam contains kerosene, which is paraffin, which we all know as wax
Anything more than the recommended dose and it will cause more problems.
I doubt it's tight valve lash IF it ran fine for the first 100 hours
You replaced both spark plugs and then you replaced another because it wasn't firing?
Was the porcelain black?
If so you may have a running rich issue.
Can you see that the choke plate is fully open when hot?
Could be a spark plug wire
Need more info
