[Shotimes] My sick SHO again

[Shylo McKinsey]

Here in NC the gas quality alone seems to really help
my car. In MT, we had 85, 87, and 91. I never ran
below 87, and got about 22 in town, 26 on the highway.
91 got me about 23-24 in town, and about 29 on the
freeway. Down here I usually get about 24 in town and
about 28 on the freeway with 87 or 88 or whatever the
midline is here. Haven't tried 93 yet. I'm just happy
that my almost 200k engine still gets decent mpg...

Shylo McKinsey

'91 White MTX

--- Rick Glass <rick@pitroadproducts.com> wrote:
> That '93 octane may be part of your MPG
> issue......my '94 always got 2-3 mpg
> better with 87 octane, I always drive with a very
> heavy foot and averaged
> about 17-18 mpg for the majority of the 125k I put
> on it....and I never had
> any driveability issues...other than crank and cam
> position sensors.
> I'm sure the mpg would have been a little better if
> I could have kept my
> foot out of it.
> 
> Rick Glass
>    Nashville, TN
>    SESHOC
> '99 Silver 44k
>    Flowmaster 40's
>    no "pre-muff"/no resonator
>    still not Kirk'd
> ----- Original Message ----- 
> From: "Jonas Diener" <jdiener@rosettastone.com>
> To: <shotimes@autox.team.net>
> Sent: Tuesday, April 20, 2004 1:12 PM
> Subject: [Shotimes] My sick SHO again
> 
> 
> > Thanks for all your suggestions regarding my last
> long post.
> >
> > Unfortunately I still haven't got it all worked
> out.
> >
> > The main problem is a stumble at low RPMs,
> especially when the engine is
> still cool.  It also is hard to start sometimes, and
> feels somewhat weak at
> higher RPMs -- Feels as if the spark timing is
> retarded.
> >
> > I don't get very good fuel mileage either.  My
> last tank of 93 octane got
> me about 14MPG.
> >
> > So far I have replaced (in the order listed) the
> inline fuel filter, CID
> sensor, CPS, plugs & wires (sealing the plug wells
> at the same time), and
> the DIS module.
> >
> > The plugs & wires made a big difference.  It no
> longer misses or burns
> fuel in the cats.  The other things didn't seem to
> make any difference.
> >
> > I also checked the fuel pressure at idle and under
> load.  It looked good.
> >
> > It seems as if the air/fuel mixture is screwed up.
>  When it's cold, if I
> snap the throttle wide open at idle, it will chug
> and hiccup for a second or
> two before it revs up, sometimes even stalling. 
> It's not as bad when it
> warms up, but it's not right either.
> >
> > The guy I bought it from seemed to think the MAF
> sensor had a problem,
> although he didn't elaborate as to why he thought
> that.  Visually it looks
> OK and I've re-seated the connector a couple times.
> >
> > The tach on the dash has never worked since the
> day I bought it, which is
> what led me to suspect a DIS problem.
> >
> > Another weirdness is that the temp gauge always
> reads low.  It does move,
> so it's not totally broken, but it never makes it
> above the bottom white
> line on the "normal" range.
> >
> > I replaced both the thermostat and the sender unit
> to no effect.
> >
> > I also dropped the Y-pipe to check for the nasty
> sand stuff.  While the
> pipe is shaped in such a way that I can't see into
> the cats, I shook and
> knocked it around a bit and no sand or other debris
> fell out.
> >
> > Anyway, the possibilities for what's causing my
> stumbling problem are
> being narrowed down.  Right now I think it could be
> any of the following:
> >
> > * A vacuum leak.  I've have ordered a new upper
> intake gasket thinking it
> may be leaking there.
> >
> > * The butterflies for the secondary intake runners
> are stuck open.  I plan
> to clean the intake good the next time I have it off
> and check the butterfly
> operation with a vacuum pump.
> >
> > * The MAF sensor is indeed screwed up.  (or the
> BAP sensor.)
> >
> > I'm half tempted to buy an LPM as a remedy.
> >
> > The computer doesn't report any meaningful codes. 
> Sometimes KOEO finds an
> IAB problem and sometimes it doesn't.  The stored
> codes have told me the
> HEGO sensors read too rich, as well as too lean.   I
> have yet to have it
> complete a KOER test without stalling (tried many
> times on different days at
> different engine temps).
> >
> > I'm open to ideas...again.
> > -- 
> >
> > the truth may be out there
> > but lies are in your head
> > _______________________________________________
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> > Shotimes@autox.team.net
> > http://www.team.net/mailman/listinfo/shotimes
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