Quote:
Originally Posted by mx6gt1
I'm not sure if the o 2 sensors have been changed. Not since blowing oil when I bought it with a bad cvv. Not sure how long the previous owner ran it like that. Could the catalytic converter be plugged too? Anyway to test the o2 sensors and cat? Or anything I can check with torque app?
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The oil that was getting trough you engine is not good for either an O2 sensor or Cat.
Bad cat usually has more severe symptoms that you are experiencing. Engine won't rev normally and it will have what sounds like more fan noise. Bother symptoms are because the exhaust is very restricted.
Bad pre cat O2 sensor will cause the engine to miss though should not be cylinder selective.
I suggest you switch the new injector with another cylinder and see what you get. I am guessing 4 will not miss, 5 will still show it has a miss, and the cylinder where the new injector will show a miss. If that is the case my conclusion would be the new injector is not working properly or is not the correct injector and the cause of the miss in 5 is not the injector.