Diagnostic Aids
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This is a visual inspection to determine if an exhaust restriction is contributing to a performance problem.
- Visually inspect exhaust system for damage. Repair as necessary. Start engine. Briefly raise engine speed to 3500 RPM and inspect turbocharger exhaust backpressure butterfly bellcrank. Ensure bellcrank is not closed. When bellcrank tang is against stop, valve is fully open. See Figure.
- Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn A/C off. Using scan tester, access EBP PID from PID/DATA monitor menu. See ADDITIONAL SYSTEM FUNCTIONS in the TESTS W/CODES - 7.3L DIESEL article.
- Observe PID reading and briefly raise engine speed to 3500 RPM. If PID reading is 28 psi (193 kPa) or less, exhaust system is okay. If PID reading is more than 28 psi (193 kPa), possible causes are:
- Collapsed or plugged tail pipe.
- Plugged or damaged muffler.