Mahmoud Hussein Moussa

2004 tl u can feel the car miss fire but it doesn't give any code for mise firing it only gives code for bad oxygen sensor bank 1 . i just changed the spark plugs to new NGK LASER IRIDIUM Spark Plug IZFR6K-11 # 6994 .. what could be the reason and what can i do to find out or to fix it ?

Turbonut

iTrader: (1)

I'd say no missfire if no code. Any leaks in vacuum lines?

Project_CLean

iTrader: (2)

When does it misfire? just at start up? I would also agree with Turbo and say if there is no code,the ECU doesn't detect a misfire present.

Are you sure it's a misfire,what about a worn motor mount causing vibrations?

mp3car

Did you change the plugs because it was misfiring, or did you change them and now it is misfiring? How long has it been throwing a code for bad O2 sensor? But in general, if it's not running right, and the ECU is reporting a bad sensor of any kind, seems to me you'd want to take a look at what is causing that code, is it really a bad sensor? Replace if so... Maybe the problem you're seeing is a result of a failed O2 sensor. All that beig said, mine just started misfiring (https://acurazine.com/forums/3g-tl-problems-fixes-114/misfiring-889703/).