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High Idle

Old 01-06-2012, 10:57 PM
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High Idle

I have read several posts on this but have not found help.
Basically my daughter's 79 is idling about 1800 when cold and hot.
I recently replaced the CHTS, the wiring harness attached to the CHTS, the plugs, the thermostat and air filter. I'm pretty sure there is NO vacuum leak. I replaced all the vac lines.
What to check?
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Old 01-07-2012, 10:01 AM
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Supposing that ALL sensors are working correctly, I would check the TB stop screw. There's also a huge idle adjustment screw.
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Old 02-03-2012, 11:48 PM
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Just to close this thread I should add the problem was the plenum wasn't installed properly at the throttle body and air was getting past.
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Old 02-04-2012, 09:17 PM
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Originally Posted by garretthes
Just to close this thread I should add the problem was the plenum wasn't installed properly at the throttle body and air was getting past.
That would be the OTHER throttle body adjust screw - the one that holds it onto the plenum lol
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