Good Sam Club Open Roads Forum: Tech Issues: Onan Microlite 4000 Generator Issue
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 > Onan Microlite 4000 Generator Issue

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travisc

Pacific NW

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Posted: 05/09/20 07:25am Link  |  Quote  |  Print  |  Notify Moderator

Check the obvious air filter and spark plug. You should do that anyway and change the oil while your at it, ours did that and we cross referenced the plug online and got one at auto zone and our was running again.


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WingsFan1313

Pahrump, NV

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Posted: 05/14/20 04:14pm Link  |  Quote  |  Print  |  Notify Moderator

Thank you so much to everyone for your help. I got my motorhome Thursday of last week, and I have learned so much because of your help. I'm not mechanically inclined at all, but I've gotten so far with everything this week and there's no way I would have been able to do it without you folks.

UPDATES: I changed out the carburetor (all by my freakin' self -- that's huge for me) and IT STARTED AND STAYED STARTED! I got giggles and goosebumps because I seriously stink at anything automotive/electrical/small engine so this was a major achievement for me.

NEW ISSUES: So the generator runs great -- fires right up, stays fired up... until I try to turn on the air conditioner. As soon as I flip the switch to COOL, the generator starts spasming -- the only way I can describe it is like a sine wave of high to low -- WHIRRRRRrrrrrrrRRRRRRRrrrrrrrrRRRRRrrrrrr. I know that's the absolute newbie way to describe it, but that's what it's doing. I don't want to do any damage to the generator, so I turned it off, turned the AC off, and then a few minutes later, I fired up the generator again. Works like a charm... until I try the AC again... same deal.

If anyone has an idea, I'm all ears. I know so much more about this thing now and I can't wait for my DMV to finally open so that I can get plates and get moving. [emoticon]

Kpackpackkelley

Bryan tx

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Posted: 05/14/20 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

Run your ac on shore power and if your dvm is a clamp On you can see how many amps it’s pulling. Your ac could be pulling to many amps for the generator.
Does your generator do the same thing when you turn on the microwave and the hot water heater at the same time ? They should be a little over 20 amps with nothing else running.

WingsFan1313

Pahrump, NV

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Posted: 05/15/20 01:36am Link  |  Quote  |  Print  |  Notify Moderator

I went out a little bit earlier today and just tried to use the microwave with nothing else and it did the same thing. I'm seeing online that I may have to adjust one of the arms feeding the carburetor... But I'm still doing my research on that.

Kpackpackkelley

Bryan tx

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Posted: 05/15/20 07:01am Link  |  Quote  |  Print  |  Notify Moderator

When you get your multi meter you can test better. Could be a number things.

STBRetired

I-80 and I-55

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Posted: 05/15/20 07:25am Link  |  Quote  |  Print  |  Notify Moderator

The manuals for the Onan generators are available online. There is a section on how to adjust the governor.


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Kpackpackkelley

Bryan tx

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Posted: 05/15/20 09:45am Link  |  Quote  |  Print  |  Notify Moderator

http://www.skilledcrafting.com/onanfiles/

Kpackpackkelley

Bryan tx

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Posted: 05/15/20 09:47am Link  |  Quote  |  Print  |  Notify Moderator

http://www.skilledcrafting.com/onanfiles/
Model and spec letter of gen will get you to the service manual.

Kpackpackkelley

Bryan tx

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Posted: 05/15/20 09:49am Link  |  Quote  |  Print  |  Notify Moderator

If you start adjusting anything make a mark and count turns of screws so you can get back to where you were encase you need too.

* This post was edited 05/15/20 11:09am by Kpackpackkelley *

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 05/15/20 09:53am Link  |  Quote  |  Print  |  Notify Moderator

RECOMMENDED REGARDLESS

Coarse emery cloth. Disconnect house battery negative cable

Then one by one disconnect and shine up all cable connections to the generator.

Do the ground cables as well.

This will keep you busy and bright connections are essential. Wire brush threads

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