I have an 05 CTS-V hardly driven (basically sits 77k miles) and started to get flashing check engine light. Pulled code and reads P0300 and after driven awhile it’ll change to P0304. I changed the spark plug and coil in bank 4 and swapped wires. Still no change. My next step is to swap injectors but I am having a hard time finding any “how to” vids or write-ups. Can anyone help me or point out any resources. Any additional help on the codes and misfire also greatly appreciated. Thanks in advance!
Pull the fuel pump fuse and crank the engine a few times to remove any pressure in the fuel system.
Use gloves and rags, you will make a mess.
I highly recommend you replace the fuel injector O-rings after you remove them, and remember to torque the bolts properly.
Alldatadiy is a cheap and awesome resource with step by step guides, I'd suggest getting an account. I think my last renewal was $36 for 3 years or something like that. It's been a while.
-Byron
