3. Intake/Exhaust Restriction

3. Intake/Exhaust Restriction

Purpose:

This purpose of this test is to determine if an air intake or exhaust restriction is contributing to a no start or hard start condition. If the engine does start with a high air intake or exhaust restriction a considerable amount of black/blue smoke is produced.

Intake/Exhaust Restriction

^ Inspect the air filter and inlet ducts.
^ Inspect the exhaust system.
^ Check for illumination of the air filter restriction indicator (F-Super Duty/Excursion)






Recommended Procedure:

Inspect the air cleaner inlet and ducting to verify it is not blocked or collapsed. Inspect the air cleaner housing and filter for proper installation. Inspect the filter minder to assure intake restriction is below the red marks. Inspect the exhaust system for damaged or blocked pipes.










Possible Causes:

Note: Reset the Air Filter restriction gauge after repairing a restriction concern.

^ Snow plastic bags or other foreign material may restrict airflow at the air inlet
^ Misrouted air cleaner ducting
^ On engines recently repaired rags or cap plugs may have been inadvertently left in an air inlet pipe
^ Tailpipe or muffler may have collapsed or been damaged

Tools Required:

None