8.8.1. Check

EGR valve

1. Start the engine in the idling mode.

2. Remove a vacuum hose from the EGR valve and on its place connect the manual vacuum pump.
3. Using the manual vacuum pump, create vacuum in the EGR valve, at the same time vacuum has to be steady, and operation of the engine has to be unstable. If vacuum decreases, and operation of the engine did not change, replace the EGR valve.