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

[KBATTPO]

"James Murray (LMC)" wrote:
>
> "17" of vacuum is normal-" not necessarily... I think it depends where you
> have your Boost gauge plumbed. I have mine "T"  right before the ECU and I
> wasn't getting more than 10psi of boost but the Vacuum was nice and strong
> (17 or more if I remember correctly).

Mine is T-off by the ECU and shows -19" Hg at idle. Used to show 17-18
psi of boost when the car was stock.


>         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.

It shouldn't be like this. In my car boost goes from progressively from
-19" Hg to ~ +10psi of boost. After that after you really step on it it
snaps to +22 psi. But that's not stock any more.

>         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
>         ?

As the OXS gets older you'll be seeing the opposite. THe Lambda will
slow down its bounces to about 0.5 Hz. With a new OXS the frequency of
oscillations is about 1 to 2 Hz.

>         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.

Depends on the model year. Check with the Family Album.

Igor Kessel