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Old 07-28-2021, 02:20 PM   #1
AxialFlux
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Brand: Thor Motor Coach
Model: ACE 30.1
State: West Virginia
Posts: 93
THOR #21234
Onan QG 4000 stops running, possibly heat related?

I've done a lot of research on this, and I know it is a common problem for these to sometimes stop running in hot weather. This seems to be what mine is doing, as it only started when the temps here got into the 80s, however, once it stops, I can start it up again, and it will run fine for another hour or so before stalling again.

I've changed/checked the oil level, replaced the spark plug, and even opened the door to provide better ventilation. Airflow seems to be fine, as I cannot seem anything blocking the fan/vents. I thought the plug had fixed it, as yesterday, I ran the genny from 11am to 4pm with no issue, however it did stall around 5. I am boondocking and working remotely, hence running it all day.

I assume this is heat related vapor lock, but if that was the case, shouldn't it fail to start right back up?
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