[V8] On the road to recovery - was ECU grounding, etc. (abridged)

Wed Oct 12 09:05:01 EDT 2005

That's great news, Dave!  With the previous Cat problem (in all likleyhood
caused by the too rich running with the bad MAF), your oxygen sensor is
toast.  Preliminarily, you might want to confirm by simply unplugging the
OXS and ddisconnecting the battery for a bit to reset the ECU before
replacing the OXS or not.

Ingo

----- Original Message ----- 
From: "Coleman, David" <David.Coleman at blackrock.com>
To: <dsaad at icehouse.net>; <v8 at audifans.com>
Sent: Wednesday, October 12, 2005 1:49 AM
Subject: Re: [V8] ECU grounding, etc. (abridged)

> I'm using a paper manual for 1990. The cd manual I have is 90-94. Not sure
if the paper one is worth keeping around.
>
> ANYWAY, I replaced the maf and my car runs much better. Word to the wise:
don't take the order in which the book walks thru diagnostics too literally.
One of my early gut feelings was the maf sensor but in 150k miles I haven't
had one go. Guess I was due.
>
> After swapping the maf, codes showed 4444 (the first I'd seen that w/ the
4.2). So I set the rachet on righty-tighty and put everything back together
cuz I gotta test drive. That included reconnecting the O2 I'd unplugged
earlier.
>
> Blasted down the road, goes great. Starts this sputtery running thing
up -- oh, yeah, that. Pull codes, 2341 (runs extremely rich or lean, bad O2,
etc). Since 4444 showed when o2 was unplugged, hopefully a new O2 will get
me back there.
>
> Quite coincidentally a flaps is closing and had 40% off everything a few
weeks ago, and I picked an o2 up along w/ a bunch of bulbs and whatnot. Just
hope it's the right one. It's bosch, I think it is the ford universal 4 wire
deal.
>
> I also picked up an O2 sensor socket while there. 3 week shelf life for
random spares seems pretty good...
>
> DC
>
>
>
> --------------------------
> David A. Coleman
> BlackRock
> Sent via BlackBerry Wireless
>
>
> -----Original Message-----
> From: v8-bounces at audifans.com <v8-bounces at audifans.com>
> To: v8 at audifans.com <v8 at audifans.com>
> Sent: Tue Oct 11 18:40:23 2005
> Subject: Re: [V8] ECU grounding, etc. (abridged)
>
> I am not sure what electrical manual you are using, but I have the real
paper
> one I bought along with the microfiche. This paper manual was newer than
the one
> floating around on the manual CD. Since you have a 91 5 speed, there could
be
> some issues.
>
> I thought the big changes were wiring for the 5-speed, and the door
lock/alarm
> was a little different.
>
> If it gets down to it, I can try to fax you pages, or even photo copy and
mail.
> One day I plan to get the whole manual scanned and added to the CD - but
that
> day seems to be getting farther and farther away...
>
>
> btw, have you actually measured fuel pressure and flow?
> I like to make double sure that sort of stuff is OK before tearing into
wireing.
>
>
> Dave
>
>
> Quoting "Coleman, David" <David.Coleman at blackrock.com>:
>
> > OK, my thing w/ the TPS is that El Manual says the output signal is used
> > by the ECM to determine transmission shift points -- n/a for a
> > U-Shift-It.
> >
> > WAIT.  STOP the JOB.   Looking at my manual on CD, the damn thing has
> > different language than my hardcopy at home!  The CD version says to
> > check ECU ground at 10, 14, 19, and 24.  No mention of 54.  Oh for the
> > love of all that's good and holy.
> >
> > I guess I'll go off this version from here on out...
> >
> > -dc-
> >
> >
> > > Yup, great spark on both sides.  Tell y'all what I'll do.
> > > I'll swap out the TPS and the MAF tonight w/ "hoped to be
> > > good" used ones.  Perhaps I'm barking up the wrong path
> > > altogether, mixaphorically speaking...
> > >
> > > -dc-
> > >
> > >
> > > > Refresh my memory, please.   Seems like this has been a quest
> > > > for over a
> > > > month now.  Anything happen just prior to your V8 running rough and
> > > > sooper rich?  Good spark from both distributors /wires?  No water
> > > > ingress into the TPS?  Did you swap out the MAF and/ or TPS?  You
> > > > patched up that hardline hose leak to the CC valve, right?
> > > >
> > > > I went through a long, drawn out diagnostic for over a
> > > month with the
> > > > urq a few months back and missed something that I should
> > > have figured
> > > > out quickly because I discounted the problem part -- until I did a
> > > > little bit of disassembly.
> > > >
> > > > My sympathies,
> > > >
> > > > Ingo
> > > >
> > > >
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