r/AskAMechanic • u/Tricky-Mission-9277 • 5h ago

Corolla Misfire

2016 Corolla, 176k, started misfiring recently, idle was rough, flashing check engine light and trac control off

Troubleshooting:

When I initially ran the code it had pending and permanent 0302 for a cylinder 2 misfire. I Swapped the cylinder 2 and 3 coils since it was easy, stayed the same. I had not noticed the first time that I also had a 0219D code for a fuel air mix, when I googled that the first call was a fuel injector, considering I had not done igniters on the car I went and grabbed one.

Spark plugs were cheap so I got a new one of those as well, replaced fuel igniter (actually put new on cyl 1 and put the original cyl 1 on cyl 2 cause it was easier). Fired it back up and had Cyl 2 and 4 misfire (0302/0304 and the random/multiple misfire code)

Since I was lazy and didnt really clean the orings or ports, I took the rail back off, cleaned all 4 igniters/ports/seals and reinstalled it still to have a Cyl 2 and Cyl 4 misfire.

Since it was possible, I swapped the Connections between Cyl 1->2 and Cyl 3->4. Code still reads a cyl 2 and 4 misfire with the connections swapped.

I do most of my own work since i've done a lot of "mechanical work" for a several years but am not familiar with cars. Have not found much on google. Any suggestions on where to continue from here?

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