How do I test the Idle Air Control valve?
Fleet Mechanic
Joined: Nov 2022
Posts: 1,666
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The SPOut (SPark Out) is how the PCM can advance the timing while it's running. It should be a small gray thing plugged in by the distributor ICM for you, thanks rla.
Last edited by Junktownbill99; Mar 10, 2026 at 02:33 PM.
Fleet Owner
Joined: Oct 2005
Posts: 20,761
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From: Kentucky
1992 and up model years gas engine trucks the SPOUT plug is near the Ignition Control Module (ICM) located on the driver side inner fender.
A photo courtesy of Subford:
Some of the 1991 and older trucks with a 7.5L engine had the same remote mount ICM and SPOUT plug. They are out there, but perhaps not so common it seems.
A photo courtesy of Subford:
Some of the 1991 and older trucks with a 7.5L engine had the same remote mount ICM and SPOUT plug. They are out there, but perhaps not so common it seems.
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