P0307 Chevrolet trouble code, causing mil light to blink.

Question

P0307 chevrolet trouble code , causing mil light on . mil light blinks when engine is under load.Spark plugs, ,wires, #7 coil pack ,and above cat converter o2 sensors ,have all been replaced. I cleared the codes and they are back again.What should be my next check?

Answer 1

P0307 Misfire number 7 cylinder

The misfire that is occuring may not be truly identified as the number 7 cylinder, There are times the ECM does not correctly identify the cylinder that is misfiring, The firing order for this engine is 1-8-7-2-6-5-4-3, Check the number 4 cylinder, swap that ignition coil and its plug wire to another cylinder and see if it moves,