[Shotimes] pcm problems on a 93 sho?

[Steve Weinrich]

Some black smoke is normal on acceleration.  It sounds like you might have a
bit too much from your description.

Tell the dealer to put his money where his mouth is.  Tell him you'll pay
for any SUCCESSFUL repair.

Sounds like several problems, none of which are likely to be the PCM.

The nofire at start sounds like a cam position sensor.  This sensor can also
cause problems with the tach (as can the crank position sensor).  Cam sensor
is about 33 bucks at AutoZone and takes 30 minutes to replace on an MTX.  An
ATX, probably less.

Since you are getting a Check Engine Light, you need to pull the codes.
Anyone who can follow instructions at www.shotimes.com and who has access to
a large paper clip can do it.  It's real simple.

Once you get the stored error codes, you can start solving the multiple
problems.

Depending on what that EGR code was (probably 332), it's diagnosis and
repair is pretty straight forward.

BTW, what other sensor did they replace?

Steve
89




----- Original Message -----
From: <Drnkslingr101@cs.com>
To: <shotimes@autox.team.net>
Sent: Saturday, October 12, 2002 2:20 PM
Subject: [Shotimes] pcm problems on a 93 sho?


> I took my 93 sho to the dealer because it was running rich(black carbon
was
> coming from the exhaust when i  punched it) and it ocasionally didnt want
to
> start but eventually would after numerous attempts,where the cylinders
would
> freeze and stutter then finally fire and run. Though when this happens the
> tach does not work until I get it somewhere that I can step on it and can
> slam the the rpms up past 4000 then the tach springs to life and the check
> engine light goes off until the engine reaches running temp then the light
> comes back on. Also after 20 minutes or so of highway speeds the atx wants
to
> slam into 2nd gear when I get into city stop and go driving unless I let
off
> of the pedal just b-4 the anticipated shift. The dealer who allready got
me
> for $750.00 says hes "confident" that it needs a pcm, thouhg after my last
> visit i am not so confident in theyre diagnosis since they offer no
guarantee
> and no returning of computer parts.Also after they replaced the MAF,2 O2
> censors, and one other censor, my lite still comes on,they say its an egr
> code but checked my egr valve and found it to be ok.That is where they say
it
> must be my pcm. Has anyone run into this before, the symptons are like
> clockwork and are a great way to ruin a nice drive.
> p.s. If  when the engine wont turn over as above, if I wait it out usually
> about 5 to 10 minutes it will start and run fine except after reaching
temp.
> the light will come back on but there seems to be no affect in
performance.
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