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Hi all, as per subject, need help with the above issue.
1. Check engine light comes up as the engine starts misfiring, surging, hesitating, stalling, struggle on hill climb, sounded like old VW beetle, white and or black smoke.
2. Runs fine when cruising at 70-130 kph, comes back to #1 below 70 kph, specially in slow traffic, worse in the basement parking.
3. DTC output was P0172 (system too rich) on the first day, then P0171 the next (system too lean).
4. Thoroughly cleaned up MAF sensor, O2 sensor, checked vacuum/intake lines in good condition, no exhaust leak, there is fuel in fuel return line from fuel pressure regulator
5. Pretty much done everything google and yahoo has to offer, except inspecting injectors and fuel pump.
Only things I've done prior to #1
a. added subaru SA718 fuel additive to full tank of BP ultimate.
b. treated with upper engine cleaner, revved as directed......then the nightmare began.
If you came across this same issue before and resolved it, could you please share your thoughts, I need some direction please. Thank you.
