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Pinpoint Test A: Loss Of Power

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. 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 new 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 .
    • 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 .
    • 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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