What is the Idle Air Adjust Spacer used for?

It is used to correct sludge contamination concerns of the throttle bore and plate only. Before installing, you must verify the idle speed concern isn't caused by the fuel system, IABP solenoid, throttle linkage, ignition, PCV, EGR, cooling system, or vacuum leaks.

How do you adjust the throttle plate stop screw per this procedure?

Back the stop screw off counterclockwise until it no longer contacts the throttle control arm stop, cycle the throttle plate closed, place a 0.002" feeler gauge between the stop screw and control arm, turn the screw clockwise until it just contacts the gauge, then remove the gauge and turn the screw an additional 1/2 turn clockwise.

Do I need to remove the spacer's center cup plug?

Only for 5.8L and 7.5L truck engine applications, which require additional air flow. The spacer comes preset at maximum air flow for engines 5.0L and smaller. Remove the plug with a center punch by tapping lightly from the bottom side, then discard it.

Should the throttle bore be cleaned before installing the spacer?

No. The instructions state not to clean the throttle bore/plate area because removing the sludge accumulation will reduce the effectiveness of the idle air adjust spacer.

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Ford Idle Air Adjust Spacer Installation Instructions F2PE-9F939-AA (Sheet 1/3)

Ford Idle Air Adjust Spacer installation instructions sheet 1 of 3 part F2PE-9F939-AA

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Ford CPR service instruction sheet (I.S. 9273) for the Idle Air Adjust Spacer kit F2PE-9F939-AA, used to correct throttle-bore sludge; lists kit contents and 6-step installation procedure.

AI caption February 2015 · Photo 1718 of 1799

This is Sheet 1 of 3 of an official Ford instruction sheet (I.S. 6273, © 1991 Ford Motor Company, dated 8-91) covering installation of the Idle Air Adjust Spacer service kit, part number F2PE-9F939-AA. The kit corrects sludge contamination concerns of the throttle bore and plate. A kit contents table lists the spacer assembly (F2PE-9F938-AA), attention tag decal (F2PE-9C934-AA), two IABP valve gaskets (E7DE-9F670-BA), two M6 x 1.0 x 30 bolts (N605775-S100), and the instruction sheet (F2PE-19A343-AA). The document instructs the technician to first rule out other causes of idle speed concerns (fuel system, IABP solenoid, throttle linkage, ignition, PCV, EGR, cooling system, vacuum leaks). Steps 1–6 are shown: preparing the vehicle and disconnecting the IABP solenoid, warning not to clean the throttle bore/plate area, setting the throttle plate stop screw using a 0.002" feeler gauge plus 1/2 turn, verifying no sticking/binding and running a KOEO self-test for TPS fault codes, removing the IABP solenoid, and removing the spacer's center cup plug for 5.8L and 7.5L truck applications (the spacer comes preset for 5.0L and smaller). Throttle bodies with a yellow/black sludge-tolerant attention label do not require this procedure.

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Frequently asked questions

What is the Ford Idle Air Adjust Spacer kit part number and what does it include?: The kit is part number F2PE-9F939-AA and includes the spacer assembly (F2PE-9F938-AA), an attention tag decal (F2PE-9C934-AA), two IABP valve gaskets (E7DE-9F670-BA), two M6 x 1.0 x 30 bolts (N605775-S100), and instruction sheet #6273 (F2PE-19A343-AA).
What is the Idle Air Adjust Spacer used for?: It is used to correct sludge contamination concerns of the throttle bore and plate only. Before installing, you must verify the idle speed concern isn't caused by the fuel system, IABP solenoid, throttle linkage, ignition, PCV, EGR, cooling system, or vacuum leaks.
How do you adjust the throttle plate stop screw per this procedure?: Back the stop screw off counterclockwise until it no longer contacts the throttle control arm stop, cycle the throttle plate closed, place a 0.002" feeler gauge between the stop screw and control arm, turn the screw clockwise until it just contacts the gauge, then remove the gauge and turn the screw an additional 1/2 turn clockwise.
Do I need to remove the spacer's center cup plug?: Only for 5.8L and 7.5L truck engine applications, which require additional air flow. The spacer comes preset at maximum air flow for engines 5.0L and smaller. Remove the plug with a center punch by tapping lightly from the bottom side, then discard it.
Should the throttle bore be cleaned before installing the spacer?: No. The instructions state not to clean the throttle bore/plate area because removing the sludge accumulation will reduce the effectiveness of the idle air adjust spacer.