94 GT HCI: Won't find /hold idle when Warm to Temp

[1994FiveO]

Hi Guys.

94 GT Vert here. Car ran great with 100% stock set up.

Build

• HCI Trick Flow Top End with Stage 1 Cam, 170 TW Heads, Street Burner Intake,
• BBK shorties
• OH H pipe
• Magnaflow cat back.
• Precision Stall 2800-3000 installed on the AODE.
• Ted Jenkins @ Tuning Innovations tune with SCT Chip.

The issue I am having is the car with start, find idle in park and all gears, drive great up until the point I turn it off. Once I go to restart it, it will start and idle will bounce to 2k and maybe hunt for a few seconds before stalling. Sometimes I have gotten luckly to feather the gas for 20-30 secs around 2k rpm and it finds itself to idle.

It ONLY happens when warm. Once I let it sit for 30 mins it then fires back up and finds idle just fine.

Here is what is different on this build besides above.

• Emissions (EGR) delete
• MSD distributor (replaced Remanuf)
• MAF 75mm 24#
• 24# injectors
• 255 Fuel pump
• New alternator
• New Battery

Here is what I have done:

• Updated Chip to accommodate High stall converter increasing idle
• Base Idle Reset (in gear parked idles 850-950 consistently, In park right at hair under 1k.
• Replaced ECT Sensor
• Replaced IAC Sensor
• TPS checked in range of 1.0
• Ran codes with only ones popping relating the EGR

What could it be

• I have read it could be IAT or other sensors but if car ran well before?
• Maybe MAF is ty but runs great all other times.
• PIP sensor or Distrib? However runs well when cold started
• TFI module? Read that it can get hot and malfunction during heatsoak

What do you guys think?

 

[General karthief]

Looks like nobody has responded to this issue so I'll give it a shot, this type of issue can be simple like 'oh crap!! I can't believe I did that!' To ' well hell, that was ruff'
First thing to monitor would be fuel pressure, a temporary gauge mounted so you can observe it while driving, I make notes, I suffer from CRS.
You're gonna need to check for spark at the time it shuts down.
There is a checklist but it has to be done when the problem is occurring.

Cranks OK, but No Start Checklist for Fuel Injected Mustangs

Cranks OK, but No Start Checklist for Fuel Injected 5.0 Mustangs model years 1986-1995 A word about this checklist before you start: it is arranged in a specific order to put the most likely failure items first. That will save you time, energy and money. Start at the top of the list and work...

www.stangnet.com

 

[1994FiveO]

I did find a leak at my first injector on the fuel rail by the fuel line. I noticed a raw gas smell but couldnt figure it out until today when I saw white smoke coming off the injector.

Fuel was pooling on the manifold. This could be my issue or maybe just one of them. I will attack it this weekend and start again if not.