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Pinpoint Test A: Loss Of Power

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 EXHAUST SYSTEM INSPECTION 
    • Inspect the exhaust system for damage or deterioration. Look for cracks, punctures, leaks, loose connections, dents or unusual bending.
    • Is the exhaust system OK? 
    1. YES  : Go to  A2.
    2. NO  : REPAIR or INSTALL any damaged or deteriorated exhaust components. TEST the system for normal operation.
  2. A2 BACK PRESSURE TEST 
    • Position the vehicle on a hoist. Refer to JACKING AND LIFTING article.
    • Remove the muffler and tailpipe assembly. Refer to Muffler and Tailpipe  in this article.
    • Start the engine and gradually increase the engine speed to 2,000 rpm with the transmission in NEUTRAL.
    • Is the restriction gone? 
    1. YES  : INSTALL a new muffler and tailpipe assembly.
    2. NO  : Go to  A3.
  3. A3 BACK PRESSURE TEST 
    • Remove the catalytic converter assembly. Refer to Catalytic Converter - 6.0L Diesel  in this article.
    • Start the engine and gradually increase the engine speed to 2,000 rpm with the transmission in NEUTRAL.
    • Is the restriction gone? 
    1. YES  : INSTALL a new catalytic converter assembly.
    2. NO  : No indications of a restriction have been detected. CONDUCT a diagnosis on other suspect systems. CLEAR the DTCs.
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