[Shotimes] lost MPG due to fuel pump?

[alfitz@alfitz.com]

Why do you think it's flooded? Is there some visible exhaust?

Al Fitzgerald
alfitz@alfitz.com
----- Original Message -----
From: "Erik Balser" <masho95@charter.net>
To: "Kevin & Cheryl Airth" <clubairth@cajunnet.com>;
<shotimes@autox.team.net>
Sent: Tuesday, January 14, 2003 1:42 PM
Subject: Re: [Shotimes] lost MPG due to fuel pump?


> I've changed the fuel filter on 7/5/00, the IAB on 7/12/00, and the air
> filter was changed to a K&N panel filter on 7/13/99.  The air filter has
> been since cleaned and oiled.  I notice on my car the rev's go up to about
> 1200 rpm until the car has been running a minute, this must be the ultra
> rich starting mode and then it settles down to about 800rpm.  But my
problem
> is upon inital startup, sometimes at vary times the engine will be flooded
> when i go to start it.  I have to press the gas to the floor to start the
> car.  My question it seems is why is the car flooded after letting it sit.
> Sometimes it's only been sitting 1/2 hour and it won't start.  Ran a
> cylinder balance test, but I'm told that won't check for leaky fuel
> injectors.  Can't think of any other reason that the engine would be
> flooded... Thanks, and if this makes any difference the ACT sensor comes
and
> goes when I run testing on the car.  I know the ACT sensor is fine too, so
> maybe something else is amiss.
> '95 MTX
> masho95
> http://webpages.charter.net/masho95
>
> ----- Original Message -----
> From: "Kevin & Cheryl Airth" <clubairth@cajunnet.com>
> To: "Erik Balser" <masho95@charter.net>; <shotimes@autox.team.net>
> Sent: Tuesday, January 14, 2003 1:08 PM
> Subject: Re: [Shotimes] lost MPG due to fuel pump?
>
>
> > Erik:
> >  Seems to be a lot of confusion here!
> >  When the car is started from a cold state the fuel injectors give a
ultra
> > rich fixed mixture of 2:1. For a warm start condition (115F and above)
the
> > fixed fuel mixture is 12:1. So you are much more likely to "flood" the
> > engine from a dead cold start condition (Less than 115F engine
> temperature).
> > Ford considers -20F as cold-cold and 115F as warm-cold. Note: The EPA
> > considers 68F as "cold".
> >  This rich mixture is fine if the engine starts but if it does not, you
> will
> > soon be flooded. You can get too much fuel when the IAB is not opening
> > enough or when you don't have good enough spark/ignition problems or
other
> > things. When you keep cranking the engine, the PCM will cut back the
> > injectors after 20 seconds. I have not been able to find out if they are
> > shut off or just reduced? The PCM assumes the engine is over-rich and
> needs
> > more air and less fuel.
> >  Now if you hold the accelerator pedal down the system enters the
> > "De-Choking" mode.The fuel injectors are cut off completely as the
engine
> > try's to dry out the plugs and cylinders of excess fuel.
> >  The IAB is fully open during engine cranking and supplies 100% of the
air
> > to the engine but has to close somewhat quickly and dynamically to
> regulate
> > the idle speed after the engine has started. Note that cranking and
> starting
> > are two different conditions! So your IAB might open fine and allow the
> > engine to start but if it is sticky even a little bit the car might
stall
> or
> > run rough until it warms up some. I think this is why most SHO's have a
> RPM
> > run up at start. The IAB can't react quick enough to control the engine
> > speed. Mine usually goes to 2500 RPM and then settles down to the proper
> > speed.
> >
> > I don't think this would impact your mileage but am not sure. Have you
> > changed the fuel and air filters?
> > .
> > .
> >
> >
> >
> >
> > > Just curious as my ongoing problem continues...is it possible for a
weak
> > > fuel pump to reduce the MPG of the car by 50-60 mpg per tank?  Just
> > thinking
> > > about when I had problems starting the car.  It wouldn't start due to
> the
> > > fact it was either flooded or from lack of fuel.  Anyone know what
> happens
> > > to the SHO when you floor the gas pedal on startup.  Does it cut the
> > excess
> > > fuel from entering or does it add more fuel upon startup?? My next
step
> is
> > > to find myself a fuel pressure gauge and take some readings.  Thanks
> > >
> > > '95 MTX
> > > masho95
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