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Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
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03-16-2023, 02:52 PM | #1 |
Not Yet Wild
Join Date: Nov 2022
Posts: 47
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Cold start problem
2014 Yamaha efi cart. On initial start up u can press the pedal far down and it’ll fire up to rpm for 1 second then shut down. The starter will continue to try and start it. You have to do that 7-10 times to get it warmed up. As soon as it warms up it stays running and runs great.
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03-16-2023, 04:15 PM | #2 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Cold start problem
Can’t you ease into the gas pedal for the first 30 seconds and get things warmed up and moving a bit before you floor it?
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03-16-2023, 09:04 PM | #3 |
Not Yet Wild
Join Date: Nov 2022
Posts: 47
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Re: Cold start problem
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03-16-2023, 09:09 PM | #4 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Cold start problem
Check the plug when it won’t start. See if maybe the injector is leaking down while it sits. Or maybe pump is losing prime and takes a few seconds to build the fuel pressing back up
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03-16-2023, 10:20 PM | #5 | |
Not Yet Wild
Join Date: Nov 2022
Posts: 47
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Re: Cold start problem
Quote:
Brand new pump. Checked spark plug. Checked injector open close on tester. Cleaned out injector. Fuel pump pumping a ton of fuel when ran open hose going to injector. Coils checked good. |
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03-16-2023, 10:20 PM | #6 |
Not Yet Wild
Join Date: Nov 2022
Posts: 47
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Re: Cold start problem
If you pressurize the tank it will fire right up though.
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03-17-2023, 07:24 AM | #7 |
Not Yet Wild
Join Date: Aug 2022
Posts: 51
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Re: Cold start problem
Jumping in... when you say brand new pump - was it an oem or aftermarket? I am thinking you may have a low pressure (carb) pump - which will put out a lot of volume, but at a low psi - 5-10lbs max. Fuel injection runs at a higher pressure - 30-40 (full disclosure haven't worked on the EFI stuff yet, so don't know exact pressures involved)
If you pressurize the tank and it runs, it's pointing to a pressure issue in the fuel circuit. When cold, EFI systems will increase fuel delivery for cold start. If there isn't sufficient pressure/volume - it will not be able to supply demand and leans out. |
03-17-2023, 07:28 AM | #8 |
British born Nincompoop
Join Date: Feb 2007
Location: United Kingdom
Posts: 2,456
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Re: Cold start problem
On EFI i would expect to see around 40psi.
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03-17-2023, 09:02 AM | #9 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,625
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Re: Cold start problem
I’d agree with Steve. Sounds like a fuel pump problem. I’d echo the question if it is aftermarket or OEM Yamaha. And why was it replaced to begin with?
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03-18-2023, 01:26 PM | #10 | |
Not Yet Wild
Join Date: Nov 2022
Posts: 47
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Re: Cold start problem
Quote:
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