Johnnyb46

I changed my spark plugs with Bosch double platinum as oem ones that was in before and I change my coil packs but I知 getting codes p0300 p0301 p0303 and p0304 my car is straight piped but I had put back my 02 sensors back in my exhaust can it make my car miss fire from sending bad reading to the ECM and it only miss fire wen the car is cold once warm up and I drive it nomore miss fire I知 lost

CaliBenzDriver

Yes, you've got it

The ECU directly measures and learn from upstream O2 how clean is the engine combustion. From the fuel map the long-term fuel trims used to calculate timings of gas injection.

When the combustion is poor, the trim is negative and you get lean misfires specially cold when the engine needs rich mixtures.

WOT should not be affected by conventional fuel metering.

Johnnyb46

Thank you so much cause I didn稚 have them in at first and I知 like my car was driving just fine only when it痴 cold it acts up In the morning so I知 bout to take them out now I appreciate your help so much 👍👍👍

e350forme

give it time to settle. let everything cycle a few times. let the electricity flow and sensors do their math!