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Old 05-07-2020, 08:02 AM   #1
Ghh
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Brand: Thor Motor Coach
Model: A. C. E. 30.2
State: Louisiana
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THOR #1348
Onan 4000 fault code 4

Unable to start my Onan 4000. Plenty of gas. Cranks over fine. Everything appears ok. After I try starting it flashes fault code 4. When I try and get the secondary code nothing happens. Tried resetting fault code but nothing happens. Any help would be appreciated. Thanks

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Old 05-07-2020, 12:18 PM   #2
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Model: ACE 27.1
State: Florida
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THOR #7035
4 is over-cranking: you cranked it for over 30 seconds without it starting. Are you priming it before you try starting it?
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Old 05-07-2020, 03:00 PM   #3
Ghh
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Thanks. Yes, I e done everything by the directions. I primed it for 30 seconds and it wouldn’t start. I did it several time with no luck. Thanks.
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Old 05-07-2020, 04:26 PM   #4
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With respect, if youíve over cranked it you havenít followed the directions. Mine often doesnít start right up. Typically I prime for about 10 or 15 seconds, pause, crank for about 15 seconds, pause for about another 15 seconds then crank again and it starts right up. Not to say that there isnít something wrong with yours. But itís a typical small engine and you can troubleshoot with typical techniques. Disconnect the fuel line and crank to see if the fuel pump is working. Remove the float bowl and check that itís full. Check for spark at the plug. See if the plug is wet with fuel/flooded. That sort of thing. Good luck.
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Old 05-07-2020, 04:57 PM   #5
Ghh
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Brand: Thor Motor Coach
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THOR #1348
Thanks for the input. I’ve tried everything recommended but still doesn’t start. I’ve got a friend coming over this afternoon that’s familiar with this sort of issue but not specifically Onan. I’ll let you know of the results. . Thanks for your help
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Old 05-07-2020, 05:01 PM   #6
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Also, define "plenty of gas". Most onboard generator pickups will not provide gas to the generator unless over 1/4 tank. Individual installations will vary - some higher, some lower. If you don't have at least a half a tank of gas you may be wasting troubleshooting time.
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Old 05-07-2020, 08:26 PM   #7
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Yes, the gas tank is 3/4 tank full. Learned that Lesson with my first Motorhome. Lol!! Appreciate the help.
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