Recommended Procedure

Inspect the air cleaner inlet and ducting to make sure it is not blocked or collapsed. Inspect the air cleaner housing and filter for proper installation.

Inspect for any indication of water intrusion into air cleaner/filter.

If necessary, use DSL ENG Pressure Test Kit 014-00761 or equivalent to install a Magnehelic® gauge on the port on the air cleaner and measure restriction at high idle.

Air Filter Restriction Gauge 

Fig 1: Locating Air Filter Restriction Gauge

Courtesy of FORD MOTOR CO.

Magnehelic® Gauge 

Fig 2: Identifying Magnehelic® Gauge

Courtesy of FORD MOTOR CO.