Thanks. This ended up being a cracked emissions line that was causing a vacuum leak. I replaced that line and the fuel trims are back where they should be and no more going in and out of closed loop. Fuel pressure seems to be good, don’t think I have any issues there. I do still have the...
I should've also mentioned that when it starts doing this, it's pretty much always at idle, like when stopped at a traffic light or parked in the garage. I can put it in either Park or Neutral and it will run much smoother, or I can apply a bit of throttle and it will smooth out as well.
The engine has started going in and out of closed loop. When it goes back into open loop the upstream O2 sensor goes to 0V or really close to it and the engine chugs and runs very rough. Sometimes I can give it throttle and it will go back into closed loop, sometimes it won't. I have already...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
