Pinpoint Test A: Loss Of Power
WARNING: This page is about a different car, the 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 Ford Cab & Chassis. 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
INTRODUCTION -- GASOLINE MODELS
or INTRODUCTION - 6.7L DIESEL ENGINE -- F250-F550 SUPER DUTY PICKUPS
, and SERVICE INFORMATION
.
- 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.
- 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.
- 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 INTRODUCTION - GASOLINE MODELS .
- 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.
- 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.
- A5 BACK PRESSURE TEST
- Remove the catalyst and particulate filter assembly. Refer to CATALYST AND PARTICULATE FILTER ASSEMBLY - 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 catalyst and particulate filter assembly.
- No : No indications of a restriction have been detected. CONDUCT diagnosis on other suspect systems.