[Shotimes] Random Hard to start issue "flooded"

[Alan Fanning]

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.