Which direction should the air meter be installed in the Ford Motorsport Mass Air kit?

The air meter must be installed with the air flow arrow pointing towards the throttle body.

How should the "Pants" Y-adapter be oriented and sealed?

Install the "Pants" (Y Adapter) to the air meter hose with the nipple pointing towards the ground, and plug the nipple with the large black rubber cap provided.

How much should be cut from the air inlet hoses?

Cut 10" from the air inlet hoses on the air box lid side; the hoses might need some trimming for a proper fit. Save the throttle body side.

Is it normal for the CHECK ENGINE light to come on after installing the Mass Air kit?

Yes. In some applications the "CHECK ENGINE" light may illuminate and shut off at approximately 3 miles after a cold start. This is normal and no reason for concern.

Why might the idle speed surge after starting the vehicle post-installation?

The idle speed might surge when the vehicle is started until the Motorsport EEC-IV Processor adjusts to the new engine demands. Reset idle speed to factory specification if necessary.

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Ford Motorsport F-Series Mass Air MAF Install Instructions Page 9 - Final Steps

Ford Motorsport F-Series Mass Air install page 9 of 9: air meter, hump hose and Pants Y-adapter assembly

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Page 9 (final) of the Ford Motorsport Mass Air install: reconnect PCV/EGR/throttle, install hump hose and air meter (flow arrow toward throttle body), and the Pants Y-adapter with nipple capped; cut 1 inch from inlet hoses.

Part of 1987-1991 Ford Bronco Service Procedures

AI caption January 2015 · Photo 1691 of 1787

This is page 9 of 9 of the Ford Motorsport F-Series Mass Air (MAF) conversion installation instructions, document IS-M-9000-T51*, dated 1/21/93. It covers the final steps (Steps 21-33) of the installation: reconnecting the PCV valve and hoses, throttle cable linkage and transmission control cable, EGR tube, and throttle linkage cover; installing the "Hump" hose on the Motorsport air box lid; installing the short hose and air meter/hose assembly (with a note that the air meter's airflow arrow must point toward the throttle body); installing the "Pants" Y-adapter with its nipple pointing down and plugged with the supplied rubber cap; measuring the throttle-body-to-adapter distance; cutting 10" from the air inlet hoses on the air box lid side; installing the air inlet hoses; connecting the MAF overlay harness connector to the air meter; and reconnecting the battery cables. Figure 12 illustrates the air meter/hump hose assembly, labeling the air meter, hose clamp, hump hose, wire clamp, and air box lid. Closing notes explain that idle speed may surge until the Motorsport EEC-IV processor adapts, idle should be reset to factory spec if needed, and a temporary CHECK ENGINE light within about 3 miles of a cold start is normal.

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Frequently asked questions

Which direction should the air meter be installed in the Ford Motorsport Mass Air kit?: The air meter must be installed with the air flow arrow pointing towards the throttle body.
How should the "Pants" Y-adapter be oriented and sealed?: Install the "Pants" (Y Adapter) to the air meter hose with the nipple pointing towards the ground, and plug the nipple with the large black rubber cap provided.
How much should be cut from the air inlet hoses?: Cut 10" from the air inlet hoses on the air box lid side; the hoses might need some trimming for a proper fit. Save the throttle body side.
Is it normal for the CHECK ENGINE light to come on after installing the Mass Air kit?: Yes. In some applications the "CHECK ENGINE" light may illuminate and shut off at approximately 3 miles after a cold start. This is normal and no reason for concern.
Why might the idle speed surge after starting the vehicle post-installation?: The idle speed might surge when the vehicle is started until the Motorsport EEC-IV Processor adjusts to the new engine demands. Reset idle speed to factory specification if necessary.