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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Exhaust System) >> Diagnosis And Testing >> Exhaust System >> Pinpoint Tests >> Pinpoint Test A: Loss Of Power

Pinpoint Test A: Loss Of Power

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The vehicle can have a lack/loss of power, odor, a noise or a "no start" concern. These concerns may be related to the exhaust system. Carry out the following test, if no DTCs were stored. This test is for diagnosing the source for these conditions. For diagnostic information, refer to the appropriate "Engine Controls" article.
  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? 
    • Yes  : GO to A2.
    • No  : REPAIR or INSTALL new exhaust components if damaged or deteriorated. TEST the system for normal operation.
  2. A2 EXHAUST SYSTEM FROZEN 
    • Inspect the exhaust system for frozen condensation.
    • Park the vehicle inside to thaw.
    • Is the restriction gone? 
    • Yes  : Exhaust system is OK.
    • No  : GO to A3.
  3. A3 MANUAL REGENERATION PROCEDURE 
    NOTE: Do not install shop exhaust with vacuum to the vehicle tailpipe. The vacuum at the shop exhaust will alter the back pressure readings.
    • Position the vehicle on the ground with the exhaust system exit free from obstructions and with adequate ventilation.
    • Make sure the vehicle has at least one-fourth tank of fuel.
    • Carry out the manual regeneration procedure. Refer to appropriate "Engine Controls" article.
    • After regeneration is completed, gradually increase the engine speed to 1, 800-2, 000 RPM with the transmission in NEUTRAL.
    • Is the restriction gone? 
    • Yes  : Exhaust system is OK.
    • No  : GO to A4.
  4. A4 TAIL PIPE BACK PRESSURE TEST 
    • Position the vehicle on a hoist. Refer to JACKING & LIFTING .
    • Remove the tail pipe. Refer to TAILPIPE - 6.7L DIESEL .
    • Start the engine and gradually increase the engine speed to 1, 800-2, 000 RPM with the transmission in NEUTRAL.
    • Is the restriction gone? 
    • Yes  : INSTALL a new tail pipe.
    • No  : GO to A5.
  5. A5 BACK PRESSURE TEST 
    • Yes  : INSTALL a new catalyst and particulate filter assembly.
    • No  : No indications of a restriction have been detected. CONDUCT diagnosis on other suspect systems.
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