DL96 - Check EGR Valve For Sticking

If customer complaint includes a rough idle or stall, the EGR valve could be sticking open or a fault in the EGR Vacuum Regulator (EVR) solenoid vacuum control could be forcing the EGR valve to open when not desired.

- Key "OFF".

- Disconnect vacuum hose at EGR valve and plug end of hose.

- Connect a hand vacuum pump to the EGR valve.

- Apply 34 kPa (10 in Hg) of vacuum to EGR valve and release while observing movement with inspection mirror if possible. Look for binding of the valve pintle.

- Does the EGR valve function in a smooth manner?

NOTE: Repeat test as necessary to ensure accurate results.

Yes -- Go to DL97. DL97 - Check EVR Solenoid and Hoses

No -- Remove and inspect the EGR valve for signs of contamination, unusual wear, carbon deposits, binding, and other damage. Service as necessary (use Rotunda EGR valve cleaner 021-80056 if needed). Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)