My car has this issue since I change the y-pipe. When cold, I press the start button and it start properly, when hot if I press the start button, it starts, the rpms drops and stops. Every time the car has this i need to press start and the gas pedal at the same time to start it.
This issue appears after removing the original y-pipe and install a bigger one. I cut the y and now i have it connected directly to the oem resonators (h-pipe).

I suspect that having FI HFC, 2.5 inch custom h-pipe and reducing to the oem resonators has someting to do with this because i have the check engine soon light on with p0420 and p0430 codes. My HFCs has the FI foulers and they are reporting out of efficency operation, maybe because too much air is passing and reducing into the resonators???

I'am thinking on installing the original y-pipe but i need the middle section again because I cut it out.

My mods are: FI HFC, h-pipe 2.5 to oem resonators, HKS filters, BB cables and BD ecu.

Thanks to all in advanced

 

Are though codes for the O2 sensors for the HFCs? I don't think the Y is the problem? I have intakes, HFC, X pipe (no oem resonators) and then Tanabe Exhausts, Granted my pipes are not as wide as yours.

Have you tried changing the ECU back to stock?

 

Those codes are from the HFC's. I talked to Tony and he suggest to send the HFC back to him to make a modification. I will put my car back to stock settings this week to test again.

 

Car is in stock settings, cel appears again and the hot start issue continues.
Any help ???

 

if you disconnected the battery for any of those services....it's probably a dirty throttle body. Disconnecting the battery forgets that it compensates for a more open throttle on warm conditions. That's why it doesn't stall when it's cold since it defaults to a more open throttle to warm up an engine. Plenty of people here that had this problem.