Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Good afternoon and welcome to JustAnswer!!My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.
I would start by doing a compression check on all the cylinders, the ones that are low pull the valvecover and inspect for broken valvesprings.. If the cylinder has low compression and the valvesprings are not broke then inspect the rocker arm to see if it moves as much as the rest of the cylinders beside it. To do this remove the ASD relay and jump the starter relay to watch the rocker arms move....
Sorry for the delay!!
If you erase all the codes and start it up how does it run? Does it still set the P0300?