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Diagnostic Aids

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This is a visual inspection to determine if an air intake or exhaust restriction is contributing to a hard or no-start condition. If engine does not start and a air intake or exhaust restriction exists, a large amount of Black/Blue smoke will exist while cranking engine.

  1. Inspect air cleaner assembly for proper installation. Ensure air ducting is not blocked or collapsed. Inspect filter minder on filter housing to assure intake restriction is below Red marks. Replace filter as necessary.
  2. Crank engine and inspect turbocharger exhaust backpressure butterfly bellcrank. Ensure bellcrank is not closed. When tang is against the stop, valve is fully open. See Fig 1
Fig 1: Identifying Open Exhaust Backpressure Control Valve Position
G95I35277Courtesy of FORD MOTOR CO.