System Check - Restricted Exhaust

Diagnostic Table:

Backpressure Gauge Setup:

SYSTEM DESCRIPTION
Proper diagnosis for a restricted exhaust system is essential before any components are replaced. Using the Restricted Exhaust System Check chart should determine if the exhaust system is restricted. The best place for checking the exhaust system is at the 02S 1 location. Once the test is completed, coat threads with anti-seize compound P/N 5613695 or equivalent prior to 02S re-installation.

TEST DESCRIPTION
Number(s) below refer to the step number(s) on the Diagnostic Chart.

3. The exhaust system under normal conditions has very low backpressure. If the exhaust system is restricted, a noticeable increase in exhaust pressure is noticed on the gauge.
4. If no high backpressure is found at idle, increasing the engine speed to 3000 RPM may find a slight restriction. The added engine speed increases the exhaust flow which will help determine if there is a slight restriction.