Need help, very rich idle and CEL

[elpiar]

I swapped to z32 maf and 555cc injectors. I swap the ECU with another one (with calum board, tuned for the proper maf and injectors) now I got a rough idle, very rich.

the CEL also turns on, but if i try to run self diagnostic by turning the diagnostic screw toggle, the red LED still stay on (solid). so I cannot even get the code

help?

[WDRacing]

You need a wideband O2 meter to know whats going on. Where did you get the ecu from? How do you know it's the correct tune? What year 240 is this.

[elpiar]

You need a wideband O2 meter to know whats going on. Where did you get the ecu from? How do you know it's the correct tune? What year 240 is this.

Yea I got PLX wideband meter and it shows 12 AFR at idle. The rough idle is very similar to when I forgot to plug in the MAF connector a few weeks ago. I read in the service manual that during fail-safe mode, the injection is simultaneous injection, not sequential (normal, according to firing order) injection. So I am guessing this is related to the CEL, not so much rich idle from the tune.

UPDATE: I swap into the stock ecu and the CEL goes away, it idles fine, but just very rich (obviously cause I got 550cc injectors in there). So this leads me to think that all my sensor and wiring is correct, but it's the ECU's fault (either the calum board or the ECU itself)

Please advise

[WDRacing]

Yep, ECU issues, atleast with the "aftermarket one".

Don't run the car with 555's and either ecu in until it's fixed. You can wash the oil off the cylinder walls and scratch the surface as well as fowl the plugs which is probably done already.

[elpiar]

ok then. thanks for hte advise