[Shotimes] engine stumbling

[Mike Bruce]

Sorry, this is on my ATX.

I did get to check fuel pressure

Cool engine idle 35-36 lbs
3-4000 goose 40 psi
slowly increase throttle 30 psi and dropping.  <-- Indicates a problem
to me


-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net] On Behalf Of Kevin & Cheryl Airth
Sent: Wednesday, August 03, 2005 7:30 PM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] engine stumbling

Mike:
 A long shot but? How about the BAP sensor? This is on your MTX right?
Do
you have one to swap around?
.
.

> >
> >
> > > Essentially what happens is, when I accelerate
> > past 4k, the engine starts
> > to
> > > stutter.  This happens almost every time.  It is
> > not an intermittent
> > problem
> > > Normally, when the car is cool like after leaving
> > work for the day, or
> > > departing in the morning, the car will act fine
> > for a few minutes then
> > > stutter after all fluids are up to temp.  I do
> > have a feeling, while it is
> > > stuttering, of a loss in power.  RPMs will still
> > increase, but not as fast
> > > as normal.
> > >
> > >  This problem first started on the way home from
> > Indy.  I decided to go
> > WOT
> > > at some point near the WV/PA border.  I got to 95
> > or 100 an engine started
> > > to stutter.  I figured that I had a tank of bad
> > gas since we had filled up
> > > at some point in OH.  I believe that the fuel was
> > an ethanol mix, and the
> > > Sunoco station that we stopped at was sorta'
> > remote.  I have run 25
> > gallons
> > > through the car since then and have treated the
> > system to a bottle of
> > > Techron.
> > >
> > > I have been swapping out what parts I can.  TPS
> > swap, no change.  DIS
> > > module, no problem.  Coil pack, discovered that
> > there are different ones
> > out
> > > there.  I don't have a spare that will work.
> > Spark plugs, no effect.  LPM
> > > is tight and secure.  Battery is good.  I wanted
> > to check fuel pressure,
> > but
> > > I could not find the adapter for our gauge.  No
> > codes.  Cylinder balance
> > > test was fine.
> > >
> > > I haven't yet, but I will be checking voltages at
> > the battery in the
> > trunk,
> > > cables near the alternator, and on the alternator.
> >  Is there a way to
> > check
> > > to see if there is enough current getting to the
> > plugs?  The ones that
> > came
> > > off the car looked great, so I can't see an issue
> > there.
> > >
> > > I'm really at a loss for finding a solution.  My
> > father and I are thinking
> > > that the fuel pump may be going out.  Once I find
> > the rest of our pressure
> > > gauge, I will verify that I have good KOEO, idle,
> > high rpm cool, and high
> > > rpm hot fuel pressure.  The fuel filter is less
> > than a month old, while
> > the
> > > pump is nearing in on 3 years.  I'm fairly certain
> > that it is a Walbro
> > > 155lph piece.
> > >
> > >  I have ordered new Motorcraft plugs, Accel wires,
> > and a Federal-Mogul
> > fuel
> > > pump from RCM Automotive.  Should be here on
> > Thursday.
> > >
> > >
> > > Mike Bruce
> > >
> > > p.s. Yes, It does seem like I post a new problem
> > every few weeks.  I deal
> > > with it.
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