I've got my car at the dyno to be tuned. Here's the problem:

MAIN PROBLEM

When the car is cold, it will start right up. But, if you let the car run a little bit and warm up and turn it off, it won't start until it cools down

What should we be checking? My tuner said that the spark coming from the plug wires is more yellow than blue.

MINOR PROBLEM

It's getting plenty of fuel - in fact, at idle it is pushing 75 - and we can't get that number to come down at all. He was wanting to get it around 45. What should we check here? I've got Ray's big pump pushing through -6 lines. Regulator is SX brand.

Thanks for the quick replies as I'm paying for dyno time as you are reading this

 

I don't think I can help much, but you may want to post this or cross post it to other parts of the forum, or try on chat.
Good luck, sorry I wasn't much help.
Does this mean we get to see numbers later?

 

Could you please post your mods as well?

 

Tuning for breakin right now. Will post numbers when fully complete.

Mods are: Greddy T-78 Single Turbo
Large Streetport / Dowel Pinned / 3 mm Seals
Greddy Down Pipe
SR Motorsports Resonated Mid Pipe
Apexi N1 Dual Tip Cat-Back
Greddy Type-R Blowoff Valve
Unorthodox Pulleys
Greddy Elbow
Greddy 3 Core Front Mount Intercooler
ACT 40% Over Clutch
Shane Racing 9.5# Aluminum Flywheel
Stainless Steel Braided Brake Lines
SR Motorsports Ultimate Fuel Pump
-6 Braided Fuel Lines
Weldon Racing Fuel Filter
SX Rising Rate Fuel Pressure Regulator
Power FC w/ Commander w/ Datalogit Laptop Software
HKS Twin Power Ignition
1600cc Secondary Injectors w/ Custom Fuel Rail
Aquamist Alcohol/Water Injection
Magnecor 10 mm Plug Wires

 

Your minor problem seems to be the problem you need to solve first. I hope you are using SX part# 15402 or 15404 fuel regulators. Any of these two should be able to be adjusted to 45psi at zero vacuum even with the fuel pump you are using. Make sure the return line is not blocked or clamped for any reason.

 

Sounds like after shutoff the regulator or something is bleeding down pressure by letting gas into the chamber and is flooding it on hot restart.


I see this alot on other cars at work. Not FD's.

Hope this helps a little at least