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Latest Posts
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Quick test. Sounds like the fuel pump is not keeping up with demand. After the 30 sec or so run time, and starts to die, give it a wiff of starter fluid and see if it recovers........fuel starved. Key OFF wait 5 sec or so....Key ON only------no start position. The fuel pump is turned on for about 5 sec to PRIME/PRESSURIZE fuel rail.....signal is from the ECM.......wait it out for time out......then start. Listen for the short prime time running. Start.....ECM should now keep the fuel pump full time. Put a test light on the pump connector (clamp to Gnd) and check for 12v. Then reverse the clamp connector from Ground to a hot +12v.....you can now check for a good ground at the connector. -
UPDATE: Got the new ECU today. Installed it and the engine fired right up ! Success... but it will only idle for about 30-45 seconds, then dies like someone cut the power. Cycle the key and it fires right back up, and I'm talking immediately. Runs another 30-45 seconds, then dies again. Plenty of fuel pressure, will test again tomorrow to get actual numbers. Right now I'm thinking Idle Air Control. I'll remove that tomorrow and check it out. I have no idea how long the machine has been sitting without running. Good news is though, the engine sounds strong when it is running. I'll report back on any progress. -
Hi Friends, Newly produced 650, 1100 rear differential will be available soon. If anyone need these differential, please send email to me at casey@leafasia.biz. Some CV Axles for Joyner is still available but inventory is low. you can also contact me if you need. Thanks Casey / Leaf Asia 2025-03-28 -
By Homeowner A · Posted
I've been having misfire issues with my UTV 400 when it gets warm and I've thrown all kinds of parts at it so far with no permanent resolution. Today I removed the O2 sensor and it is black on the end. To me that means it's running rich and/or the sensor isn't working. I replaced the sensor with a new one and will see how it goes I guess. With EFI, I'm wondering why the sensor would be this way with low hours and mileage? Is there a way to adjust or lean out fueling on these? Thanks in advance. -
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