Hey guys, ran into an issue recently and wanted to see if anyone could help me out.

I'm running a JDM 2JZGTE with USDM injectors
It fires right up, idles nice and smooth, but once it gets warm the RPM's drop slowly and it eventually dies out.

I was thinking this is due to the larger injectors and i'm still running stock ECU for now, but aren't you able to use the stock ECU with slightly larger injectors? What else could be causing this?

 

Running 25% more injector over stock is quite a bit

 

Yeah get a controller. Did you install the resistor also? Ive seen a supra idle at 10 afr and not shut off. It would also help to get a wideband.

 

play with the throttle set screw, ecu has probably done some adjusting to the iacv and needs more air via the throttle body. or you can also check the tps to make sure its working right. turn your a/c on and see if it helps that will bump up the idle a bit.

 

Or if you didn't wire in a resistor, you can now buy a new ecu because you fried the injector drivers. Good point whoever brought that up