[Eriksson042887]

Hey guys, after driving for a hour or so i get a service engine light, codes are below, i have logs attached, true fbo on stock flash.

29EO - DME: Mixture control.
29E1 - DME: Mixture control 2.
ZAAF - DME: Fuel pump, plausibility.
2C7B - DME: Oxygen sensor after catalytic converter: Signal.

I have had ZAAF for over 4 years since i bought the car.
I also have cat conversion on both banks because i have downpipes.
I hope its a faulty oxygen sensor

Idling / https://datazap.me/u/eriksson/idling?log=0&data=3-21

Cruising / https://datazap.me/u/eriksson/cruising?log=0&data=3-21

Light acceleration / https://datazap.me/u/eriksson/light-...og=0&data=3-21

[lekang95]

Look like your Low pressure fuel pump struggling.

[Eriksson042887]

Originally Posted by lekang95

Look like your Low pressure fuel pump struggling.

It’s been since I got the car, always worked fine though. Won’t replace till I actually need it.

[konstat]

Originally Posted by Eriksson042887

It’s been since I got the car, always worked fine though. Won’t replace till I actually need it.

The nominal operating pressure for the lpfp is 72 psi. Since you’re at 60 psi under light throttle you do have a fueling issue. Your rail pressure is also very low it really shouldn’t go below 1900psi at high rpm on a fbo car. In lower rpm’s it should be upwards of 2700 psi. Your peak rail pressure is 1700psi, which also indicates a problem.

Based on the above I expect your AFRs to be lean and from your logs you’re hovering around high 14s in one bank and 15s in another. I think fueling is causing the codes you’re seeing.

Your STFTs are also high which means the DME is trying to add fuel to lower your AFRs but it’s not able to without proper fueling

[lowrydr310]

Originally Posted by konstat

Your rail pressure is also very low it really shouldn’t go below 1900psi at high rpm on a fbo car. In lower rpm’s it should be upwards of 2700 psi. Your peak rail pressure is 1700psi, which also indicates a problem.

You sure about that? I have read numerous sources that say anything above 1500psi at high RPM is acceptable.

Regarding that second comment, yeah peak 1700psi indicates a fueling problem. Failing HPFP perhaps?

[konstat]

Originally Posted by lowrydr310

You sure about that? I have read numerous sources that say anything above 1500psi at high RPM is acceptable.

Regarding that second comment, yeah peak 1700psi indicates a fueling problem. Failing HPFP perhaps?

I agree 1500psi is acceptable but i wouldn't expect a FBO car to go below 1900 psi (mine doesn't at least on the strip) and so that's only relevant assuming OP is only FBO. If he's pushing more power then I'd expect rail pressure to be lower

[Eriksson042887]

Remember guys, fbo but with no tune, stock fuel system. Also the acceleration log is VERY light acceleration. Probably not even a quarter throttle. I will get new logs this Monday with AFR’s and a WOT log.

[konstat]

Originally Posted by Eriksson042887

Remember guys, fbo but with no tune, stock fuel system. Also the acceleration log is VERY light acceleration. Probably not even a quarter throttle. I will get new logs this Monday with AFR’s and a WOT log.

Your fueling values are even more concerning if you’re on a stock tune. Maybe you’ve done full throttle pulls already but be careful with WOT since you’re running lean