Engine Idles Poorly or Dies

Engine will not idle. Dies out on return to idle or idle is very rough or slow

POSSIBLE CAUSE #1
High EGR valve leakage in closed position.

Correction
If removal of vacuum hose from EGR valve does not correct rough idle.
a. Turn engine off. Remove the air cleaner exposing the inlet to the throttle body.
b. Disconnect vacuum hose from EGR valve.
c. Using a nozzle with a rubber grommet connection, direct compressed air (50 to 60 psi) down through the steel tube on the EGR valve while opening and closing the throttle blade.
d. If the sound from the compressed air changes distinctly in step c, the poppet is leaking and air is entering the intake manifold. Replace the EGR valve.

POSSIBLE CAUSE #2
EGR tube to intake manifold leak.

Correction
Remove tube and visually inspect tube seal on gasket. Tube end should be uniformly indented on gasket with no signs of leak. If signs of exhaust gas leakage are present, replace gaskets and tighten flange fasteners to 23 Nm (200 in lb). If an intake plenum leak persists, replace EGR tube and gaskets, following installation instructions.

POSSIBLE CAUSE #3
Solenoid or control signal to solenoid failure.

Correction
Verify correct hose connections and leak check and confirm that all hoses are open. If defective hoses are found, replace hose harness.

Test using scan tool and appropriate diagnostic tests. See Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Charts.