Question about 2007 Chevrolet Impala LS Sedan New Cars

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Idle adjustment - 2007 Chevrolet Impala LS Sedan New Cars

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Idle is not adjustable
pcm decide the idle rpm by iac valve
try to clean trottle body plate and iac hole with combustion chamber cleaner and pour the rest at the trottle body engine idle enough not to stall engine

Posted on Oct 11, 2013

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Posted on Jan 02, 2017

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Idle adjustment at carburator end


most older cars had 2 adjustments , a air screw for enrichment and throttle screw for engine idle speed, later models did away with the enrichment screw, to adjust set idle screw to 600 rpm, adjust air mixture screw to fastest rpm , reset idle screw to preferred idle speed.

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Set idling via screws


Most older cars had 2 adjustments , a air screw for enrichment and throttle screw for engine idle speed, later models did away with the enrichment screw, to adjust set idle screw to 600 rpm, adjust air mixture screw to fastest rpm , reset idle screw to preferred idle speed.

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How do I adjust idle speed?


You can't adjust the idle , There is a minimum idle adjustment set at the factory , you don't want to mess with that . The PCM / ECM ,engine computer controls the idle speed by the idle air control valve (motor) . You may have a dirty throttle plate mess with the base idle .Check out this video on ford base idle adjustment . Some one who didn't know cranked up the base idle causing problems Ford IAC valve test how to adjust minimum idle speed

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adjusting idle will be a big mistake,,,,tps ,trottle plate, map will be misadjust too.
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What is the problem if carburetor idles high even when valves (mixture, idle) are at low adjustment?


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First, you shouldn't adjust the idle. If the idle isn't correct, that means there is an issue somewhere - not that the idle needs to be adjusted.

There isn't an adjustment screw. To adjust the idle, you will need to move the TPS (Throttle Position Sensor) forwards or backward. To do this, you will need to remove the tamper proof bolt and replace it with one that can be loosened and tightened.

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