CO mixture adjustement, urgent

[Shawn Kubik]

Well it runs/drives ok, idle seems the worst, aside from the occasional
flash of the CEL or sometimes when it stays on drivability isn't effected,
However the idle is kinda stuttery and the plugs will have some fuel on em
when you pull them out.

It says "clamp those pesky hoses" on your site, what did that mean?  I was
under the impression I could warm it up, plug in some spade connectors,
measure the mA from the DPR and just tune accordingly.

-----Original Message-----
From: Huw Powell [mailto:audi at humanspeakers.com]
Sent: Wednesday, February 12, 2003 2:52 PM
To: Shawn Kubik
Cc: quattro at audifans.com
Subject: Re: CO mixture adjustement, urgent


> I think at this point we definitely need to examine/adjust the CO mixture
to
> get this car on the road, we have a multimeter capable of measuring 0-10mA
> and I know on my 1991 80Q it should sit @ 0ma but what about this 88 90Q?

yes, it's the same, it should oscillate steadily up and down around 0 mA
(when warm).

> Furthermore, we can get some fitting spade connectors to measure the
> amperage out of the DPR but after reading huw's website we're a bit
confused
> on which vacuum lines to block off and I guess we're just looking for a
> detailed description on how to adjust the CO mixture on a 1988 Audi 90Q

I don't do anything special, just warm up the engine and do the
measuring.  This is probably wrong though, there's bound to be
*something* silly you are supposed to do.  The "all makes, all models"
computer next door instructs you to put a 10A fuse in the fuel pump
relay... ?!

Not too sure what the Bentley says, I should look it up sometime.

That check engine light might indicate that the ignition has gone to
full retard - but that would require knocking, a bit odd on an engine
that is running plug-soaking rich, right?  maybe it is lean sometimes,
too?  Or maybe the knock sensor os bad.  Or the ignition computer...
could be damaged by water leaking in around the windsheild.

Maybe the air plate is sticking - up a bit - then at idle there would be
too much fuel, but at higher rpms, if you can get there, not enough?

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/