05 F150 4.6L P0351 and P0356 HELP

Question

Showing codes for 3051 and 3056. I have constant power to the connector and a pulsing ground. I switched the cop to different cylinders but code did not change. I am at a complete loss.

Answer 1

HI there

I would take a look at the spark plugs. If they are worn out it could cause this code to appear and not change anything when you swap the ignition coil. If the plugs are good, then I would do a compression test on those cylinders to see if there is a problem with the inside of the engine.