See Figure 1
- Remove the EGR valve and check it for sticking or carbon deposits. Clean the valve with solvent and ensure that the valve is fully seated on the contact surface.
- Connect a hand vacuum pump to the valve and apply 19.4 in. HG of vacuum. Check that vacuum is held.
- Release the vacuum and apply 1.7 in. Hg of vacuum. Blow air into one passage of the valve. Air should not blow through.
- Increase the vacuum to 7.5 in. Hg and blow air into the passage again. Air should blow through.
- Replace the EGR valve if it fails to function properly.
- Install the EGR valve using a new gasket. Tighten the bolts to 11-16 ft. lbs. (15-22 Nm) on 4 cylinder engines or 14-20 ft. lbs. (19-28 Nm) on V6 engines.