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Old 05-06-2010, 12:58 PM   #1
Pipsta
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Default As the air temp rises, my cart stumbles more

Well, the temperature outside is getting close to 100 in Phx, AZ during the day. So the evenings are staying pretty warm too for a while. I noticed last night that for the first hour or so of my driving the cart it kept wanting to stumble off a standstill. As soon as the air cooled by 10 degrees it stopped happening. It also mostly happens when I have a full load of people and I'm accelerating off a standstill. I also noticed a bit of smoke like 'rich' exhaust at these accelerating moments.

From the symptoms it seems like it's an air/fuel mixture issue. With hotter air there's less oxygen in the same amount of air and when I'm working the motor harder under load it needs to suck more air to match the increased fuel.

My air filter is new, the air ducts are sealed fine. Is there an adjustment I can do to the carb to help get a smidge more air into the mixture as the temp gets hotter outside? ...and believe me...it's only going to get hotter outside for the next 5 months here in AZ.

Any other ideas of things to check out to eliminate from the equation?
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Old 05-06-2010, 06:50 PM   #2
Jimmie
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Default Re: As the air temp rises, my cart stumbles more

You may need to check into a high altitude jet for your carb.

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Old 05-06-2010, 08:03 PM   #3
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Default Re: As the air temp rises, my cart stumbles more

I didn't realize phx, az was considered 'high altitude'...lol. Maybe the extreme hot air is simulating a higher elevation. It's not any hotter than summers in the middle of America or the southern US at this point and the problem is already popping up. There has to be something wrong or an adjustment I can make. Thanks though, I'll look into that.
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Old 05-06-2010, 08:28 PM   #4
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Default Re: As the air temp rises, my cart stumbles more

I don't know if 1100 feet above sea level is high altitude either, but they offer six different high altitude jets for your carb. Disney is close to sea level. I don't either but your engine has been stumbling for a while now. The jets are around $11.00.

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Old 05-06-2010, 08:48 PM   #5
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Default Re: As the air temp rises, my cart stumbles more

It went away with a good carb cleaning and fresh fuel/air filter. Just popped back up as soon as the air temp starting getting into the 90s. So yea, I'm not sure what it is. I'll call the dealer here and see what they got for me. It probably will have to be ordered seeing as I doubt anyone here would be looking for them very often. I don't think it's a common problem as there are bazillion gas carts in the phx area and I haven't heard once about anyone needing this high altitude mod.

I wondering if the new air filter is not letting enough flow through. It's not the club car one, it's the one that is the car equivalent from fram. It could be that it's better than the old crusty one cause it's new but it's not quite right for the cart for whatever reason.
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Old 05-07-2010, 04:45 AM   #6
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Default Re: As the air temp rises, my cart stumbles more

I checked into it further last night and it appears you don't need rejeting until you get around 5000 feet, sorry about that.

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Old 05-07-2010, 05:52 PM   #7
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Default Re: As the air temp rises, my cart stumbles more

OK, I read in your beautimus explanation in that linked thread about screw #2 and #3 but nothing about screw #4......
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Old 05-09-2010, 01:09 PM   #8
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Default Re: As the air temp rises, my cart stumbles more

4 is a jet it screws in all the way. It can be changed like a main jet not adjusted.
Be sure the little hole in it is clean.
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Old 05-09-2010, 01:30 PM   #9
Lightninlarry
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Default Re: As the air temp rises, my cart stumbles more

Could be time for a new spark plug?
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Old 05-09-2010, 01:48 PM   #10
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Default Re: As the air temp rises, my cart stumbles more

Way back in the college days, I had a Datsun that would stumble if it was hot out and the engine was already warm. Datsun came out with a fix for all the cars, a little fan that blew on the fuel line and carb, never had an issue again. Could you be having a hot fuel line and fuel is vaporizing prior to the carb?
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