[s-cars] boost/vacuum and air/fuel gauge stuff...

[Robert Pastore]

Tom:

17" of vacuum is normal-- in fact it's good if you had a leak at idle it
would be less. 10lbs of boost is low, but all else, including vacuum at
cruise, are normal.
The Air/fuel gauge is doing what it is supposed to do in closed loop the o2
sensor keeps hunting for 14.7:1, and you will see the fluctuation. The
usefulness of the gauge is at WOT to make sure in open loop you are not
going lean.
Bob
-----Original Message-----
From: Pollock, Thomas [mailto:Thomas.Pollock at hp.com]
Sent: Tuesday, May 28, 2002 2:31 PM
To: s-car-list
Subject: [s-cars] boost/vacuum and air/fuel gauge stuff...


Greetings fellow s-heads !

I've got a few questions/problems I'm hoping someone can comment on and also
need a sanity check for what I'm seeing in my newly installed air-fuel
gauge.

I finally got around to installing my autometer boost and air fuel gauges. I
wasn't COMPLETELY surprised that I'm only seeing around 10lbs of boost max.
The car has seemed down on power for a while now and I'm guessing I have a
leak somewhere, although  I'm hoping it's JUST a leak as someone recently
mentioned seeing 14lbs WITH leaking hoses...  I DID see the gauge hit 16lbs
a couple of times so there's hope.  Sound reasonable ?

Sanity check time. At idle I see constant 17" of vacuum and tooling around I
NEVER see anything close to boost. Matter of fact, most of the time I'm
sucking wind.  I don't see any boost till my right foot is really into it.
Not sure how else to quantify...  Is this normal ?
I'm really surprised. I thought if nothing else, I'd be around even
boost/vacuum when just cruising...

Next problem is the air/fuel gauge is all over the place !  Even after a
complete warm up the thing bounces pretty much the whole range.  At idle it
sits in the stoich range but still hunts.  Gotta be the 02 sensor (I hope)
but the previous owner had it replaced about 40k miles ago. Sound reasonable
?   If anyone is interested I took a bunch of pictures of the gauge install
procedure. The biggest problem I ran into was trying to get a little too
cute and installing a OEM switch into a dead switch spot for power and
illumens. That harness has NO slack whatsoever and required an almost
complete disassembly of center console. Sheesh.

Last but not least, while doing the install I noticed I have a oil leak at
the top oil pressure switch. There are two sending units and the one that's
leaking is the one on TOP.  Would anyone have a part number handy and what
are the chances that thepartsbin or equivalent would stock this kind of part
?  Guessing I need to visit the local Audi counter ?

I have a couple more request for info but I need to try to separate my
"actual problems" from my "paranoia"...

As usual, thanks in advance !!!

Down to 2 Audis !  but looking again 8-)

94 100csq
94 s4



> Tom Pollock
> Compaq Computer Corporation
> AlphaServer Product Development
> *Tel (508)467-4441
> * thomas.pollock at compaq.com
>
>
>
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