Gooood morning lupo people! 1st post!
To the nitty gritty.
Cars mot is due, CEL is on due to a lambda heater issue (diagnosed) so, purchased a replacement NGK one and before fitting checked the codes, threw up a couple MAP, EGR and such so decided to give the map a clean. Come out in a million bits didnt it so new one of those. Replaced lambda and the map sensor and broken vacuum lines, fired it up, runs like bag of sh**! So check codes, red lambda heater so clear that and it doesn't come back. Still running badly check over everything find new vacuum leak so tape that as a temp job, go back to the diagnostic and theres a new cel, p0171 system lean lambda voltage is 0.03v so yeah its lean, spent 3 hours hunting everywhere for any leaks and can't hear a hiss, feel a leak or anything.
So, now I have fixed all the vacuum leaks and given it new sensors its telling me its lean af, its also telling me that the short term fuel trim is -100% at idle... so the ecu is telling me that its yanking out all the fuel?
I changed the plugs before fixing vacuum leaks and changing everything and they were normal, the lambda was a little sooty but not super black indicative that its super rich.. so fixing vacuum leaks and giving it new sensors has broken it essentially.
Any ideas? Going to pull the EGR tonight clean that out and give the throttle body new gaskets. After that I am lost!