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billr · 02-23-2022, 02:05 PM

Clear the codes and see if the same ones consistently come back. Do this at least five times, making no changes. We need to have some confidence those are the only true codes now.

As to chasing them, I would go after the P0340 first, as it should be the easiest to solve. That has been discussed before; it has to be the ICM (includes coils), wiring, or plugs, plug wires, or ECM. Which of those parts have you checked now, and how?

Again, don't do anything until you clear codes and get them to repeat consistently.

02-23-2022, 02:05 PM	#117
billr Master Member Join Date: Jul 2013 Posts: 6,571	Re: specifics on compression testing, P0301 Clear the codes and see if the same ones consistently come back. Do this at least five times, making no changes. We need to have some confidence those are the only true codes now. As to chasing them, I would go after the P0340 first, as it should be the easiest to solve. That has been discussed before; it has to be the ICM (includes coils), wiring, or plugs, plug wires, or ECM. Which of those parts have you checked now, and how? Again, don't do anything until you clear codes and get them to repeat consistently.