I replaced the egr on the 1.8 petrol coz it was caputt 500 miles ago everything was fine until yesterday when the eml came on and the car was running`lumpy` code reader showed the egr valve as the problem so took it off and there were a few small pieces of what look like carbon around the small plunger/valve i cleaned them of and its running fine now, but where are these little bits coming from and could this be a regular problem? thanks keith oh and its done 155K.