Re: Playing in Pueblo

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <199910151856.LAA18082@gonzo.wolfenet.com> Orin Eman writes:

> Did you hit the rev limiter?
>
> I got a 2141 the other day after deliberately hitting the rev
> limiter.  The check engine light came on about an (uphill)
> mile later.

Perhaps it's detected knock because of the sudden cut in fuel pressure
(and thus supply) caused by the fuel pump cutting.  It's been a theory
of mine that engines go spectacularly lean for one or two revolutions.

Also - the sudden cut in fuel pressure caused by the pump being shut
affects the air mass sensor plate.  There are (IMO) four forces
affecting paddle position - two are control pressure (major) and
system pressure (minor).  What happens to the plate (and thus the
plunger) when control pressure suddenly disappears?

> Anyone seen the check engine light or pulled a 2141 after hitting
> the rev limiter?

No, but the MAC12D can set 2141 without flashing the light.  It does
so if I fill up with Tesco's petrol.

--
 Phil Payne
 UK Audi quattro Owners Club
 Phone: 07785 302803   Fax: 0870 0883933