P0302 Infiniti -

Question

Dear Sir,

I have got the code P0302 on my Infinity FX35, 2005 , 51000 ml. So I changed Spark plug , coil and fuel injector of cylinder 2 after Two weeks the same code P0302 come agine.

fuel sys 1 cl
fuel sys 2 cl
calc load(%) 20.8
ETC (c) 88
STFT B1 (%) 8.6
LTFT B1 (%) 0.0
STFT B2 (%) 7.0
LTFT B2 (%) -7.8
ENG RPM 650
VEL SPEED (KM/H) 0
TPS (%) 3.5

Any Help, Thanks

Answer 1

The difference is is on the Long-Term Fuel Trim (LTFT) numbers. Negative fuel trim percentages indicate that the Engine Control Module (ECM) is attempting to enlean the fuel mixture to compensate for a perceived rich condition. A rich condition is usually caused by a leaking fuel injector or no spark at the cylinder. Since the injector, coil and spark are new and there is still a rich condition on the that bank, my guess is that the fuel injector seal is leaking or there is a problem with the ignition coil circuit.