Help reading engine codes

[Jonathan Hore]

> > As far as I am aware there are only two ways to get fault codes:
> > 1 - using the fuse in the top of the fuel pump relay
> > 2 - using the 2/3 connectors in the footwell.
>
> No.  The earlier engines (those with separate idle and full load switches
on
> the throttle body - but not the ur-quattro) used the rev counter and check
> engine light.
>
> Take the cover off the switches, get the engine idling, and manually close
> the full load switch while the idle switch is still closed.  Look at the
rev
> counter - if it says 7000 rpm even though the engine is only idling -
that's
> what you have.
>

I did that and I got 7000 rpm indicated.  So what is the procedure now?

Just as a bit of background, for a while now the check engine light has been
coming on when I am accelerating and I go above approximately 3000 rpm.  If
I back-off it goes out.  It had been in need of a service so a few weeks ago
I changed the plugs, leads, cap, rotor and air filter hoping that it may
also
have some impact on the light - but it didn't.  When the light does come on
it is generally associated with a slight loss of power.  Having said all
that, occasionally it doesn't come on and she goes like a rocket.

Any thoughts?

Jon