Examination
EGR valve
Start the engine. Disconnect the vacuum hose from the EGR valve and plug it with a plug.
Apply vacuum to the EGR valve. The vacuum should be stable and the engine should run rough.
- if the vacuum does not remain stable and the engine operates normally, replace the EGR valve and retest;
- if the vacuum remains stable and the engine runs normally, remove and inspect the EGR valve.
EGR system
Any check of the EGR system requires special tools and testing equipment and should be performed at a service station.
EGR valve and pipe
Remove the negative terminal from the battery. Remove the air supply components to the engine.
Disconnect the vacuum hose and unscrew the bushing nut securing the EGR pipe to the valve (see Fig. 4E.21).
Unscrew the 2 bolts and remove the valve from the intake manifold. The valve gasket must be replaced each time the valve is removed (see Fig. 4E.22).
Remove 3 bolts and exhaust manifold heat shield.
Disconnect the 2 pressure converter hoses from the EGR pipe.
Unscrew the nut securing the EGR pipe bushing to the intake manifold and remove the pipe.
Clean the mating surfaces of the EGR valve and manifold.
Installation is carried out in the reverse order of removal.