[Shotimes] Random Hard to start issue "flooded"

[Jonas Diener]

I'd like to chime in and say "me too". I also have this problem. Been 
with the car since I purchased it about 2 years ago.

Starting cold always seems to work fine. For me the issue only arises if 
I then stall out and need to restart.

I've replaced both the cam sensor and the crank sensor, to no effect. 
Same for the fuel filter.

I've tried monitoring the fuel pressure when it's acting up, and it 
looked fine to me.

Alan Fanning wrote:

>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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