[Shotimes] My sick SHO again

[Carl Prochilo]

About the MAF, I just went through this problem in case you didn't
read all the posts.  The symptom was exactly as you state, namely
low RPM stumble.  In my case the computer told me that it was seeing
a low voltage from the MAF, so I knew where to look.  The MAF
connector was backing out enough to be marginal.  I've heard that
people with similar problems splice in a new female connector.

Try a few thing in this area.  Clean the filament with a soft brush
or use electrical contact cleaner.  Also clean the MAF connector. 
If none of that helps, see if you can borrow a MAF from someone.  If
you are in the south Florida area, I have a spare 55mm you can try.
-- 
Cheers,
Carl Prochilo
1992 Ultra Red Crimson

Jonas Diener said:
> 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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