[Shotimes] Random Hard to start issue "flooded"

[Leigh Smith]

Alan;
I'd love to know why also.
Any chance you have the original fuel pump like me?
Any idea if you have fuel pressure after an hour? (just press the fuel psi
valve on top of the engine)
Lee

----- Original Message ----- 
From: "Alan Fanning" <Awfanning@earthlink.net>
To: "SHOtimes" <shotimes@autox.team.net>
Sent: Tuesday, February 28, 2006 10:01 PM
Subject: Re: [Shotimes] Random Hard to start issue "flooded"


> I have this problem with my '91 SHO, but never when it's the first
cranking
> of the day. My injectors were all cleaned and balanced without any change
to
> the problem. I haven't monitored the fuel pressure, but have thought maybe
I
> should. Fuel pump was replaced by previous owner - only ~110k miles on it
> now. A couple of times I've let it crank and crank, but only when I put
the
> pedal to the floor does it start - and immediately. Would love to know
why.
>
>     Alan
>
>
> wrote:
>
> >
> > Message: 1
> > Reply-To: "Leigh Smith" <leigh1322@comcast.net>
> > From: "Leigh Smith" <leighsm@comcast.net>
> > To: "SHOTIMES" <shotimes@autox.team.net>
> > Date: Tue, 28 Feb 2006 00:02:09 -0500
> > Subject: [Shotimes] Random Hard to start issue "flooded"
> >
> > I need the help of someone who's been thru this one. Any ideas on how to
> > troubleshoot?
> > ..
> > Symptoms: Random no-start or hard to start; appears flooded, and starts
easily
> > with foot on floor to clear the "choke". Fuel pressure sometimes drops
while
> > sitting 15min to 1 hour to zero psi.
> > ..
> > Car: 94 MTX; brand new factory crate engine, original: injectors, fuel
pump,
> > O2's (100k). New: fuel/air filter, IAB, CID, CPS, wires, plugs, etc.
> > NO codes.
> > ..
> > I'm thinking A) leaking fuel pump and/or check valve B) leaking injector
C)
> > leaking fuel pressure regulator.
> > ..
> > Any other ideas?
> > Or ideas to troubleshoot?
> > Lee
> >
> > --__--__--
> >
> > Message: 2
> > Date: Tue, 28 Feb 2006 07:38:42 -0500
> > From: "Zach Leahy" <leahyz@gmail.com>
> > To: "Leigh Smith" <leigh1322@comcast.net>
> > Subject: Re: [Shotimes] Random Hard to start issue "flooded"
> > Cc: SHOTIMES <shotimes@autox.team.net>
> >
> > Typically Leigh if the car does not start on the first crank, which is
> > pretty uncommon but happens occaionally, you need to put your foot all
the
> > way down on the accelerator to get it to start.  My understanding was
this -
> > and this information came from Doug Lewis iirc.
> >
> > When you first go to start the engine, until the cam sesor crosses the
> > pickup, the engine does not know what cylinder is ready to fire.  Since
it
> > isn't sure which to fire it does not know which one to put fuel into the
> > mix.  So to minimize cranking time, when the key is first turned the
> > computer fires all 6 injectors so that it has an available fuel charge
as
> > soon as it knows where each piston is and then can start lighting off
> > cylinders.  The problem is that when we don't crank quite long enough to
get
> > the motor to fire, and then crank it again, that the system will fire
all 6
> > injectors again basically flooding out the engine.  The solution is to
put
> > your foot all the way down when cranking which I believes signals a
cutoff
> > for the injectors.
> >
> > Just what I've been told, it makes sense to me... but I'm not sure if
it's
> > 100% accurate.
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