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Travis

Not wanting to idle

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My ol mule is acting up suddenly. It doesn't want to idle, it revs prefect just not idle. It eventually dies. I'm thinking something in The idle passage is plugged. Any other suggestions are appreciated that I may have over looked.

Brand new Wix fuel filter. That carb has been on for 19 years and never cleaned. Just b12 chemtool in the tank. I may hook up an auxiliary tank and see if it's fuel lines. But probably not since it revs fine.

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Great job!  I've used Sea Foam in the gas tank, let it run for an hour or so, cleans the garbage out. I've heard of mechanics doing this and then charging for tuneups.

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I just read on another forum about someone having the same issue with a chain saw. It would run great but not idle. Turned out it was the spark plug. Something failed internally. 

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Could be, I put a new Champion plug in about 6 weeks ago. 

And it started all the sudden,  it ran fine that morning and went to go start it later and it wouldn't idle.

But it idles good at 3/4 choked.

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Couple things, if the new spark plug was a different heat range, it would affect the idle characteristics.  Second, the idle air screw having trash or corrosion will do this. 

For those that don't understand carburetor fundamentals, the carb runs off the idle air screw from idle to about 2500 rpms.  From about 2500 to 3500rpms, it's a combination of idle air and main jet fueling.  After 3500 rpms it's all main jet fueling.  So, hopefully that helps some folks narrow down their carburetor troubleshooting.  

For example, idles fine but boggs down at higher rpms, you have main jet issues (the big one that pokes up through the middle of the carb).  Bad idle but runs with open throttle, idle air issues (usually a screw or smaller needle type, may be under a thin tin cap that you drill or pry out (EPA thing), up in the front of the carb). 

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Okay, weird thing. 

Go out and fire up the mule, it idles PERFECT. I drove it around for about 10 minutes. Then let it idle for several minutes. Drive it around some more. Then let it idle, idles perfect.

I guess the b12 chemtool I put in it worked it's magic...

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