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Old 10-02-2012, 11:23 AM   #6
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FYI, on modern fuel injected vehicles the throttle stop screw serves two functions.

1. it prevents the throttle plate from closing completely, which would cause wear as it hits the sides of the bore as well as tending to stick in the closed position. ('stiction" happens anyways from accumulation of "crud" over time - when it gets sticky clean it)

2. factory settings allow a specific air flow when the throttle is closed (set on a flow bench) to get throttle closed air flow in a range where the IAC system has the range to adjust it to desired levels. (needs to be able to both throttle it down when warm, and raise it for cold starting or extra loads like A/C or high alternator draw)

"Close enough to work" can be achieved through experimentation, but it's a LOT easier just to leave it alone unless damage/wear requires adjustment.

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