9. Exhaust Restriction

9. Exhaust Restriction

Purpose:

The purpose of this test is to determine if an exhaust system restriction is causing a performance problem.

Exhaust Restriction

^ Visually inspect the exhaust system for damage.
^ Monitor the EP PID with the engine oil temperature greater than 80°C (1 76°F) at 3,800 RPM in park or neutral.






Recommended Procedure:

^ Access and monitor the EP and RPM PIDs
^ Increase the engine speed to 3,800 RPM.
^ Record the EP PID value.
^ A low RPM or an EP PID value greater than 244 kPa (35 psi) indicates a restricted exhaust condition.

Possible Causes:

^ Collapsed or restricted tail pipe
^ Clogged catalytic converter
^ Damaged muffler
^ Turbocharger

Tools Required:

Diagnostic tool