Idle Running Rich

[rmahnovetsky]

Hey Guys

I have a problem with my R33 GTS-t running rich on idle. I can smell the fuel and I can see it with consult. On idle it will never go lean.

I have had an idle issue since day dot and have been trying to diagnose the problem. I bought a new oxygen sensor which is the ford type and I seems to using a litle more fuel then before .i.e getting about 10.4/100 instead of high nines. I wonder if the ford type is not a perfect match???? Though I could smell fuel even before that.

Does anyone know what might cause rich fuel mixture on idle?

MOds: full exhaust, 040 fuel pump, safc, intercooler. K&N filter (square type).

[WogsRus]

leaking fuel injector or regulator? maybe. having simmilar issues myslef.

[rmahnovetsky]

2 year ago I got the fuel injector ultrasonically cleaned. The cleaner said the injectors were fine and didin't even need cleaning. So I guess they dont leak then.

I swapped the fuel regulator and the AAC valve with a mates and still had the same issue.

Thanks for your input unfortunately thats not the answer for my problem

[RANDY]

I thought this was normal? Mine does it. Always "rich", but then that could even be just a *fraction* richer than the narrow-band that the stock O2 sensor can detect. (14.7 or whatever)

[skylinecouple]

water temp sensor is shot so no signal means always reading cold therefore rich.

[Adriano]

water temp sensor is shot so no signal means always reading cold therefore rich.

+1 or try cleaning the air flow meter, have you checked the ecu trouble codes?

[rmahnovetsky]

RANDY: I don't know if reading rich is normal on idle. I just presume that idling rich is no good, fowling up plugs etc. My old o2 senser was rattly and maybe the ford copy is not the same as the nissan o2 sensor and thus still giving me problems?

Adriano: ECU codes show no faults. On idle at ~700rpm the AFM is showing 0.98.

skylinecouple: Water temp reading 80 degrees when the motor is warmed up.