[Shotimes] engine stumbling

[Leigh Smith]

I think not wires, they would miss most when things are lean, like warm
idle, or especially 2200-3000 rpm, light throttle. Not hard running. Save
your money.
I sauspect fuel pump. That describes the exact symptoms I had when mine died
at about 180k.
Three years doesn't sound like long for a fuel pump. Both my stock ones
lasted 10 yrs.
Anyone else with a Walbro pump have any comments on how long they last
before I put the one on my bench into my car?
Lee

----- Original Message ----- 
From: "Co-Op" <Co-Op@SchrammInc.com>
To: <shotimes@autox.team.net>
Sent: Wednesday, August 03, 2005 8:13 AM
Subject: [Shotimes] engine stumbling


> 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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