96 gc8 issues

[acidbath]

my non sti wrx is being a prick, when its cold overfuels maybe runs like crap farts around etc fine when hot tho.

Replaced afm and fuel filter no change. No error codes, i have another ecu with speedlabs chip in it and it give me an error code for o2 sensor and injectors, would an o2 sensor cause my issue? and why wouldnt factory ecu pick it up? any help appreciated

[Guest]

ECT in the crosspipe would be my pick.

[acidbath]

whats ect? you mean exhaust crosspipe?

[Guest]

Nope coolant cross pipe that runs across block under intake mani. Engine Coolant Temp sensor tells the ecu exactly that. Does it run fine when at operating temp on cruise?

Doesnt hurt to change O2 sensor anyway theyre only good for 100,000odd km sometimes manufacturers have a shorter interval.

[acidbath]

yeah runs mint when warm, thanks mate i will replace that and o2 sensor just to be sure