How do you clean an EGR valve on a 1999 vw passat what effect does it have if its failed?

Answer 1

three small hexagon nuts need to be removed and be careful with the anti rattle switch ( whice is the small black piece next to the egr), also try removing the pipe leading down to the manifold ( 2 nuts, and attached to the egr valve) soak this overnight in paraffin, with the egr valve use truck film remover or carb cleaner,and a small brush ( metal brush may be too harsh, hard plastic\nylon brush is more suitable) be warned it is a messy job three small hexagon nuts need to be removed and be careful with the anti rattle switch ( whice is the small black piece next to the egr), also try removing the pipe leading down to the manifold ( 2 nuts, and attached to the egr valve) soak this overnight in paraffin, with the egr valve use truck film remover or carb cleaner,and a small brush ( metal brush may be too harsh, hard plastic\nylon brush is more suitable) be warned it is a messy job, failure of the egr would probably result in loss of power and rough idling, basically the egr sends back heat into the engine ( sometimes to kill of unspent fuel, also to bring car to operating temp alot quicker than other cars), you can actually do away with the egr valve and not notuce any difference, but that would be an enviromental issue ( throwing out gases when your engine can churn them up for you) also there is an allard steel pipe available, whice replaces the egr valve, and is hole free so no more oily bits on your engine.