C7 and C9 Industrial Engines Troubleshooting – Exhaust Has Excessive Black Smok

A. Check the air inlet system for restrictions and/or for leaks.

B. Check for an air filter restriction.

C. Perform a visual inspection of the system for restrictions and/or for leaks in the air inlet piping.

D. Ensure that the turbocharger is in good repair.

E. Check the exhaust system for restrictions.

Proceed to Test Step 2.

Result: There are signs of damage or failure in the air inlet or exhaust system.

Repair: Repair the air inlet or exhaust system.

A. Remove the sensor.

B. Remove debris, moisture, or ice from the sensor.

C. Install the sensor.

D. Check the Caterpillar Electronic Technician (ET) for active diagnostic codes on the sensor. If no active diagnostic code exists, the sensor may be used. The correct reading for the atmospheric pressure is between
50 kPa (7.25 psi) and
100 kPa (14.5 psi).

Proceed to Test Step 3.

Result: There are codes present for the Atmospheric Pressure Sensor.

Repair: Troubleshoot the codes before continuing with this procedure.

A. Verify that the latest flash file is installed. Refer to Troubleshooting, “ECM Software – Install” for information.

Proceed to Test Step 4.

Result The latest flash file is not installed.

Repair: Install the correct flash file. Verify that the problem has been resolved.

A. Cold weather adversely affects the characteristics of the fuel. Refer to Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold-weather operation.

Proceed to Test Step 5.

Result The fuel quality is not within the engine specifications.

Repair: Replace the fuel with fuel that is within the engine specifications.
Verify that the problem has been resolved.

A. Check the valve adjustment. Refer to Systems Operation/Testing and Adjusting for information that is related to valve adjustments.

Repair: Make the appropriate adjustment. Verify that the problem has been resolved.