EGR Valve/Backpressure Transducer Assembly
- Check vacuum hoses for correct routing. Warm engine to normal operating temperature. Connect a vacuum pump to EGR valve. With engine idling, slowly apply 2-3 in. Hg. Engine RPM should drop when vacuum is applied.
- Disconnect vacuum pump from EGR valve. Connect vacuum gauge to EGR vacuum supply hose. Start engine and raise engine speed to 2000 RPM. Vacuum gauge should read about 5 in. Hg. If test results are as specified, system is okay.