Hello all. I'm desperately seeking some troubleshooting advice. My son has a 99 camry with 200k + miles. Car ran great for quite a while but started shaking real bad one day. I pulled the codes and got a P0301 and P0304...i figured it was an easy kill since both those plug into the same coil. Put a brand new coil in it and the P0304 went away and the idle got a bit smoother, but cylinder #1 is still not firing, the P0301 remains. I swapped coils and the problem did not follow. I unplugged the #1 injector and the idle didn't change at all. I moved i injectors around and the problem did not follow. Does anyone have any other troubleshooting ideas i can use to try and narrow down why #1 won't fire. I am definitely not a Toyota guy by trade, so if there is some obvious component I am overlooking...like the equivalent of the notorious ford TFI unit, please let me know. Thanks!

 

Looks like i may have figured it out...for all my swapping around, i didnt move plug wires around (they only have 5k miles on them). Sure enough, problem follows #1 spark plug wires. That's what i get for not starting with the basic stuff first

 

Glad it is set!