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Old 09-05-2015, 12:01 AM   #1
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Unhappy Yamaha EF2000is surging & low oil light flickers

First post but long time lurker. I'm pretty bummed

I bought two EF2000is and a parallel kit from electric generators direct online. One of the units runs like a champ. The other has a rough idle and surges heavily under no load. Almost acting fuel starved. The oil light flickers which according to the manual is a sign of low oil.



I double checked the unit and it is full of oil. I'm upset because the website won't let me return the generator and the nearest service center is ~100 miles away. So much for my tailgating plans next week.
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Old 09-05-2015, 08:50 AM   #2
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Sounds fuel related to me.


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Old 09-05-2015, 08:59 AM   #3
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If it's giving a low oil warning the genny may be trying to shut down and since the low oil is flickering it would be sort of an on/off/on signal to the ignition. Are you SURE it is properly filled with oil???
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Old 09-05-2015, 09:05 AM   #4
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Perhaps you have a faulty low oil sensor. See if the oil light flicker and the engine hesitation on related in timing.
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Old 09-05-2015, 09:10 AM   #5
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If the engine is stumbling the oil sensor might come on. I would dump the fuel and put some Premium in and try that. Works wonders on a lawnmower or weed wacker for me. I run Premium exclusively in my generators.
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Old 09-05-2015, 09:11 AM   #6
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Quote:
Originally Posted by B and B View Post
If the engine is stumbling the oil sensor might come on. I would dump the fuel and put some Premium in and try that. Works wonders on a lawnmower or weed wacker for me. I run Premium exclusively in my generators.
No ethanol for sure!

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Old 09-05-2015, 09:12 AM   #7
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Quote:
Originally Posted by KyDan View Post
If it's giving a low oil warning the genny may be trying to shut down and since the low oil is flickering it would be sort of an on/off/on signal to the ignition. Are you SURE it is properly filled with oil???
After watching the video again I think your right, bad oil sensor.

I think I'd try switching the running gennie oil sensor in the non running unit.

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Old 09-05-2015, 12:50 PM   #8
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Or, if 2 wires are going to sensor, hook 'em together and temp. by-pass sensor....Vented fuel cap? Open?
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Old 09-05-2015, 01:33 PM   #9
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It appears, from the video, that the oil light comes on and the engine starts to die, which to me indicates it's the oil sender shutting down the engine rather than a fuel issue.


As KyDan recommended, check your oil level and top it off if necessary. Then turn the ECON.SW to off (0) and try it again several times. Maybe there is an air bubble in the oil system that will be forced out by the engine running at full throttle.
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Old 09-05-2015, 02:17 PM   #10
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Or, if 2 wires are going to sensor, hook 'em together and temp. by-pass sensor....Vented fuel cap? Open?
Since they are new I would be looking for an approved Yamaha service provider. You go in and start messing with it yourself you can kiss the warranty goodbye. Check the oil. Make sure you have fresh fuel, preferably
non-ethanol. If it's beyond that take it in with your proof of purchase showing when it was bought.
When I was in that field one of the first things we did was look for any signs of a unit being taken apart or altered from the factory settings. If we did, no warranty. It's amazing how many people think the warranty will cover what they have done to a unit.
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