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Idle fluctuates up and down

Engine starts well and have to keep at full throttle for a while or it dies. Once it warms up I lower the idle and the engine seems to fluctuate. I don't know it it's the governor or adjustment of the carburator. Any advice?

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This sounds like a carb problem. While there are not adjustments on the carburetor other than the idle stop screw, you can still disassemble the carb and clean it out. For what it's worth the flapper thing at the engine side of the carb is the throttle, that other flappy thing at the air cleaner side of the carb is the choke. :-)
Modern day small gas engines like this have really small holes in the carb compared to the good old days. You should carefully look in the fuel tank for any junk and dirt that may have sneaked in there (blow it out with air), also look at the fuel line and if it's not soft and nice replace it. Lastly be sure to poke a thin wire thru all of the holes in the carb when you're cleaning it, dirt hides everywhere.

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Carl

Posted on Dec 03, 2008

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2002 Jeep Liberty - 3.7 Liter - Engine has begun to die when rpm is at or near idle. Such as pulling into a parking place or stopped at traffic light. More frequent after engine has warmed. Once engine...


I would start with cleaning the throttle bore and plate. Then clean the Idle Air Control valve, IAC, as this is the device that controls idle speed. Use a can of spray carb cleaner and an old toothbrush. Trouble with the IAC would make sense if you can keep the engine going by holding down the gas pedal a bit.
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The alternative to this is a fuel injection system. And, you only think you have problems now. Read some of the problems those people have on this forum. I'll keep my '94 FXDWG.

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