Hi. Experiencing strange high gasoline consumption (doesn’t matter how I drive the car; sporty or not, the gasoline needle goes down as you watch with your eyes, no gasoline smell from engine bay or any gasoline puddle under the car);
First of all, car runs great, no missfires, no rough idle, no hesitation, no trouble at cold start or warm, despite this high gasoline consumption without me even flooring it, just normal driving.
Trouble codes: I remember I got P0172 - system too rich, a while ago not recently and P2293 - fuel pressure regulator 2 performance randomly under hard acceleration in 3rd/4th gear.
Okay, first, I noticed when I turn off the engine (warmed up) the pressure in fuel rail is going down slowly instead of going up which tells me during engine running it’s struggling to maintain fuel pressure.
Now what fuel trims are trying to tell me?
At idle: having negative Short Term Fuel Trim (-12%) and positive Long Term Fuel Trim (16%), O2 sensor fluctuates kinda badly from lean to rich and from rich to lean.
youtube.com
In 4th gear at 2k RPM: STFT is around -5/+5, even 0%, LTFT starts to increase slowly from 16% to 20%, 02 sensor mad fluctuations! Yt videos attached.
youtube.com
First of all, car runs great, no missfires, no rough idle, no hesitation, no trouble at cold start or warm, despite this high gasoline consumption without me even flooring it, just normal driving.
Trouble codes: I remember I got P0172 - system too rich, a while ago not recently and P2293 - fuel pressure regulator 2 performance randomly under hard acceleration in 3rd/4th gear.
Okay, first, I noticed when I turn off the engine (warmed up) the pressure in fuel rail is going down slowly instead of going up which tells me during engine running it’s struggling to maintain fuel pressure.
Now what fuel trims are trying to tell me?
At idle: having negative Short Term Fuel Trim (-12%) and positive Long Term Fuel Trim (16%), O2 sensor fluctuates kinda badly from lean to rich and from rich to lean.
STFT and LTFT at idle
youtube.com
In 4th gear at 2k RPM: STFT is around -5/+5, even 0%, LTFT starts to increase slowly from 16% to 20%, 02 sensor mad fluctuations! Yt videos attached.
STFT and LTFT in 4th gear at 2k RPM
youtube.com
