[Shotimes] High NOx diagnostics

[Kevin & Cheryl Airth]

Alan:
 At idle opening the EGR should really effect the engine if not stall it?
Maybe the passages are partially clogged or the EGR valve is not opening all
the way? I would try some spray cleaner first and maybe remove and inspect
the EGR valve.
.
.

> If I put vacuum to the EGR with the engine running, I get a  slight
> reduction in rpm's, but no suggestion of killing the engine. Is this
> typical?

> Thanks,
>
>     Alan