"Jafir Elkurd" <jafir@nospam.no.spam.hotpop.com> wrote in message news:<10cbchpj4uubh0d@corp.supernews.com>...
> Normally when the computer throws a code for that, it is because the lift
> sensor in the EGR valve doesn't sense the valve opening. Could be a busted
> diaphragm (check with a vacuum gauge) or a bad sensor in the valve, or a bad
> vacuum control system causing the valve to never open. Usually if you have
> EGR port problems the computer thinks everything is working fine.
>


the most common reasons for a code of EGR are insufficient lift, and
reduced flow. it detects clogged ports by way of the MAP sensor, if
there's a lot of lift and no pressure change the ports are clogged.
on one of that vintage you need to remove 6 plugs with a slide hammer
to clean them.
Chip