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Check for Intake / Exhaust Restriction

Jake Mayock

Meet Jake

Jake is a founder of 8020 Media and one of the lead writers at DieselIQ. He has over 10 years of experience in the automotive industry and is the proud owner of a 2002 F-350 7.3 PowerStroke. When Jake isn’t working, he’s usually wrenching on his PowerStroke, single turbo BMW, or Miata track build. Jake delivers tons of knowledge and hands-on experience and is a valuable asset for those looking to take their diesel to the next level. He is highly knowledgeable on Powerstroke and Duramax diesels.

Checking for Intake Exhaust restriction is a a visual inspection 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.

Recommended Procedure:

Inspect the air cleaner inlet and ducting to assure that 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 back pressure device bellcrank during cranking and assure that it is not closing. Inspect the exhaust system for damaged or blocked pipes. When the tang is against the stop, the valve is fully open.

 Possible Causes

  • 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.
  • Exhaust back pressure device may be closing during cranking or stuck closed.
  • Tailpipe or muffler may have collapsed or been damaged or the catalytic converter is clogged.

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