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Old 01-07-2020, 03:41 PM   #6
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,622
 

2003 L-Series 3.0L Sedan
Default Re: Throttle always sticks a bit DOHC

The factory adjusted throttle stop screw never closes the throttle plate. If you examine your throttle you should see it slightly opened unless someone before you misadjusted it. It's never fully closed at any time.

Adjusted from the factory, throttle plate opening with the bypass air port blocked off is set for 500-600 rpm. You'll never be able to adjust the throttle stop screw unless the bypass air port is blocked, the hole in front of the throttle plate that allows air to bypass the throttle plate. Bypass air flows thru Internal passages to the idle air control valve where its controlled by the pcm. The pcm adjusts the iacv for idle rpm for electronically controlled idle, not the throttle stop screw. And if you are observant, the difference between blocked bypass port/throttle stop screw idle and final idle being higher is the supplemental air controlled by the iacv for idle.

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