I would check the blue water temp sensor at the back of the head. The best way is to check the resistance between terminals 11 and 29 on the ECU hairbrush. You should have between 800 and 5000 ohms with the engine cold.

Some chips are written such that if the circuit is open (ie sensor has failed, or wiring not connected or broken) the ECU thinks the water temp is very low, so chucks massive amount of fuel in.