Dunno if anyone will be able to help me with this, hope so, here goes.........
When I bought my 1994 Cav Sri 16v (X20XEV) in August I could hear a faint humming noise from the passenger side on startup when the engine was cold. I understand this to be the EGR air pump?
Well, lately it's got noisier, and started to sound more like a vacuum cleaner than a slight humming.
Yesterday I started the car and it is now making grinding noises, and appears to be almost cutting out for a split second.(the EGR thingamajig, not the engine, the engine seems fine)
I've traced the noise to the air pump/EGR Motor (whatever its correct name is) inside the passenger side wing, and as soon as it stops running (after a minute or so) the grinding noise stops too.
My question is:- Do I wait until the thing finally gives up the ghost, or should I replace it ASAP? How important is it? I'm guessing here, but, I assume it's used to recirculate unburnt fumes etc back into the combustion cycle to reduce emmisions. Does this also save the CAT from being damaged by said unburnt gases??
Anyway, basically, how critical is it, and do you think I should replace it before it dies?
Thanks in advance,