Nacho bellowed in an authoritative tone:

> This is a generic question. Is the EGR valve always open in the cars that
> have one?
>

The EGR valve returns exhaust gases back into the combustion chamber to
reduce combusion temperature and hence oxides of nitrogen. This also
reduces engine power. EGR occurs under certain throttle, manifold air
pressure, coolant temperature, RPM, and a few other items.

A rough approximation might be 1/3 throttle, warm engine, >2000 RPM.



--
Does the name Pavlov ring a bell?