[Shotimes] Random Hard to start issue "flooded"

[Zach Leahy]

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.

Z


On 2/28/06, Leigh Smith <leighsm@comcast.net> wrote:
>
> 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
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