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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

What causes a surging idle at 2rpm?

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Old 02-16-2016 | 07:53 AM
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d-wood's Avatar
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What causes a surging idle at 2rpm?

When I hold the gas at 2rpm it surges. It does it after its cranked for about a minute or so. It's a 93 22re. I thought it might have been from a vacuum line that the po plugged but I have another post about why the po did that and some said there's is also plugged. Any thoughts?
Old 02-16-2016 | 10:46 AM
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engine cold or warm when surging? There is a ton of topics about surging idle. Need more info. Mine did the same once at operating temps. Found it was a clogged idle air control valve.
Old 02-16-2016 | 06:39 PM
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Right on. Well mine does it when it's about a min ute or two of starting it up. Thanks.
Old 02-16-2016 | 11:26 PM
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From: Anderson Missouri
Burping the coolant system will cut down on the surging. Raise the front end up high and let it idle with the radiator cap off for 4 or 5 cycles of the thermostat to get the air out of the system.
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