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erratic idle problem and lopeing when coning backe to idle

Old 05-05-2009, 08:00 PM
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erratic idle problem and lopeing when coming back to idle

I have has the truck for about 4 months now. I installed a 366 spring and turned in the fuel screw and adjusted the fuel pin to the deepest side and turned the star wheel a little. It has been idling fine up until about a week ago. It idles up and down just a little bit while in park. when I am driving and coning to some traffic where I just have my foot barely on the pedal it will start to lope like it has a hot cam. It also will lope if im in park and I just bump it off of idle it will lope for a little and then high idle like it should. I searched and found the loping thing might be air geting into the system from one of the lines fuel filter ect. for the idle up and down I read maybe it could be a broken top hat spring? any input would be great thanks Fred
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Old 05-05-2009, 08:55 PM
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Mine would actually drop below an idle when I let off sharply. Are you running Bio? I've been running regular ULSD with some conditioner. Seems the extra lubricity helps the sticky governor linkage.
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Old 05-05-2009, 09:02 PM
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Ive been running fuel from the pump since this has started with 2 stroke in it before I was being a bad boy and running some fuel that was the same color as my truck... and as soon as I went to the pump this has started
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Old 05-06-2009, 12:35 PM
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Last night I took the pump top off and looked around. the Top has spring is fine my 366 spring looks like a 366 spring. there is just some thing that I am not catching could the start spring that they talk about in the ve operation be weak and causing a erratic idle and maybe a lope rite off of idle? Befor I took the pump top off I tried to adjust the idle and I almost backed the screw all the way out before obtaining a low enough idle then if i snaped the throttle it would rev back up to there it was and I would have to lightly move the throttle around to get it to go back down to idle.
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Old 05-06-2009, 06:55 PM
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It sounds like you have the throttle indexing out of whack.
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Old 05-06-2009, 11:12 PM
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really would that just make it start to do these weird things?
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Old 05-07-2009, 08:02 PM
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Yes, they don't idle right if they are indexed wrong.
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Old 05-07-2009, 08:54 PM
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Its just weird that it would start to do this 3 months after I had it apart.
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