[Shotimes] Intermittent Misfire on '94 w/ATX (long)

[J.B. Hebert]

Ah, totally forgot to mention that.  Yes, I did both tests when the problem 
first started, but I have not done them since the most recent increase in 
severity.  When I ran the tests, everything came back normal.  I'll try 
them again tonight if I can get the car running long enough to warm up.

Thanks,

J.B. Hebert

At 09:29 AM 3/16/2004 -0500, you wrote:
>Just curiious.  In any of that long list of work did you do a KOEO
>or KOER test?
>--
>Cheers,
>Carl Prochilo
>1992 Ultra Red Crimson
>
>J.B. Hebert said:
> > Hello:
> >
> > I've been working on a problem with my '94 SHO 3.2 ATX.  It's
> > driving me
> > nuts, so I'm hoping that someone here can point me in the right
> > direction.  It started a few months ago with a surging/misfire at
> > light
> > throttle input.  I thought I might have gotten some bad gas, so I
> > ran a few
> > containers of Techron through and the problem seemed to go away.
> > Then a
> > week or two later it came back again.  It felt like one or two
> > cylinders
> > were not firing properly.  Following standard troubleshooting for
> > these
> > cars, I first checked the spark plug wells.  Sure enough, 2 or 3
> > were
> > nearly full of oil, so I replaced all the valve cover seals and
> > cleaned out
> > the spark plug wells thoroughly.  After reassembling the car, the
> > problem
> > once again seemed to be resolved.  However, after a few hours of
> > driving it
> > returned.  At this point I had my mechanic run a few tests, and he
> > found
> > that one of the cylinders was running lean.  I decided to have the
> > injectors rebuilt in case I had one intermittently sticking.  At the
> > same
> > time I replaced the coil, in case I had one that was failing, as
> > well as
> > the air and fuel filters.  I put the new injectors in, and once
> > again
> > everything was fine for a while.  Then the problem returned.  At
> > this
> > point, I thought it might be a spark issue.  Even though the
> > previous owner
> > had recently had the spark plugs and wires replaced, they did not
> > use
> > quality wires, so I replaced the spark plugs with the appropriate
> > Motorcraft platinums and put a set of Taylor spiral core wires in.
> > After
> > doing this, the car ran great for about 15 minutes.  I took it out
> > on the
> > highway and got it warmed up, then did a couple hard acceleration
> > runs.  It
> > was running out smoothly and with good power.  However, after the
> > second or
> > third run, I noticed that the car wouldn't rev over about 3800 RPM.
> > It was
> > like it was hitting a rev limiter or something when it tried to open
> > the
> > secondary runners.  Suddenly, I completely lost power and the tach
> > dropped
> > to around 300RPM, even though the engine was still turning much
> > faster than
> > that.  I managed to get to the next off ramp and at this point the
> > car was
> > running on MAYBE two cylinders.  It would move, but the exhaust note
> > was
> > very bad and the transmission was having trouble shifting.  The tach
> > was
> > way off; it would read around 400 RPM even after a shift.  Around
> > this time
> > the cabin started to fill with nasty, burnt plastic smoke.  I pulled
> > off to
> > the side of the road and shut down.  I popped the hood and could not
> > find
> > the source of the smoke.  It soon disapated so I started the car,
> > and it
> > ran much better.  However, while limping home it got worse again and
> > the
> > smoke returned.  I made it home and shut the motor off, coasting
> > down the
> > driveway.  Once again I was unable to find the source of the smoke.
> > One
> > last thing to note:  at no time during any of this has the check
> > engine
> > light come on.
> >
> > This car is driving me nuts, and making me long for my '89 MTX.
> > Does
> > anyone have any ideas what might be causing this?
> >
> > Thanks in advance.
> >
> > J.B. Hebert
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