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Old 10-06-2017, 11:20 AM   #1
tonym
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Default Onan 4000 ky no start

Don't know where to look next. This unit is about 10 yrs old total hours unknown. It has good fuel and flow ,spark and compression. Carb was gone through completely . New spark plug also. Does the control module tell the engine to start? It does appear to be a timing issues since it makes a "puffin" sound while cranking and cycling. If so can the problem be with the module? Thank you.
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Old 10-06-2017, 02:23 PM   #2
Hacksaw
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Default Re: Onan 4000 ky no start

I once had similar trouble with my 4000. When I was away from my trailer it ran out of fuel. After that it would start and run only while on cranking mode. Put in a new board to fix it. I'm guessing it didn't like the high and low rpm surging as it starved for fuel and fryed something.
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Old 10-06-2017, 02:31 PM   #3
tonym
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Default Re: Onan 4000 ky no start

Thanks, Hacksaw
Is there any way to check module?
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Old 10-06-2017, 02:52 PM   #4
Hacksaw
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Default Re: Onan 4000 ky no start

I'm sure there is but looks tricky to me. I'd bet most trouble shooters swap out the board with a good one rather than go through it. Those Onan gens have several "fail safe" circuits that run through that board.
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Old 10-06-2017, 03:05 PM   #5
Hacksaw
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Default Re: Onan 4000 ky no start

Hey Tonym: Remembered switching boards on mine and no difference. Just dug out copy of receipt for the repair and turns out I was mistaken. My fix was the voltage regulator, not the board. $149.00 in 2008. Sorry to aide in your confusion.
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Old 10-07-2017, 10:54 AM   #6
tonym
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Default Re: Onan 4000 ky no start

Thanks, Hacksaw Ill check it .
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