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Old 11-11-2013, 10:05 AM
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akingf5371 akingf5371 is offline
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Default FJ40 Creeping Idle?

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I have a question I was hoping to get some opinions on. I recently re-timed the 40 and then set the idle at 650rpm. In the mornings have to start it with at least half choke and it fires right up, after warming up and taking the choke off the idle is about 650-700. After driving to work or running errands the idle will be at 700-850. What could be causing this? I've been kicking around the idea of doing the lean-drop method of setting the idle to get to a base-line but wanted some other thoughts.
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Adam Farmer

2010 4Runner Trail 3" Lift, UCAs, and 285 Goodyear Duratracs

1982 FJ40 Green 4" Rough Country Lift, RE-smogged, and getting better every day! (Mid - Resto)

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Old 11-11-2013, 10:07 AM
SteveH SteveH is offline
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How about a vacuum leak (manifold?) that seals up when the engine comes up to temperature? I would certainly do the lean-drop method (and check the carb bolts, and manifold bolts while you're at it) and see if that fixes it.
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Old 11-12-2013, 08:46 AM
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Originally Posted by SteveH View Post
How about a vacuum leak (manifold?) that seals up when the engine comes up to temperature? I would certainly do the lean-drop method (and check the carb bolts, and manifold bolts while you're at it) and see if that fixes it.
Steve-
Not a bad idea. I'll check for a leak
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Adam Farmer

2010 4Runner Trail 3" Lift, UCAs, and 285 Goodyear Duratracs

1982 FJ40 Green 4" Rough Country Lift, RE-smogged, and getting better every day! (Mid - Resto)

email: adamkingf5371 at yahoo.com
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Old 11-12-2013, 05:55 PM
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Rzeppa Rzeppa is offline
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I see in your sig line that the rig has been re-smogged. There are a number of subsystems in the emissions mess that control idle speed and could be responsible for the observations.
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Old 11-13-2013, 09:18 AM
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Jeff, not a bad idea.. I don't relish the idea of going and testing the small parts all over again, but it's worth a shot.
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Adam Farmer

2010 4Runner Trail 3" Lift, UCAs, and 285 Goodyear Duratracs

1982 FJ40 Green 4" Rough Country Lift, RE-smogged, and getting better every day! (Mid - Resto)

email: adamkingf5371 at yahoo.com
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