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 scan tool and the engine temperature greater than 80°C (176°F) at 3,800 RPM with the vehicle in PARK/NEUTRAL.







Recommended Procedure:
- Access and monitor the EBP 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:
Scan tool