I have replaced spark plugs and injector. Determind its not the coil. And still getting the po306. What can it be?

 

What engine?

 

5.7 hemi

 

Dropped valve seat, rounded off cam lobe, pcm not firing the injector or coil, etc.

Hear any odd noises at idle?

 

No just low rpm

 

Rough idle cause rpm too low at 600

 

Does it misfire at cold startup? Or only once the engine is warmed up a bit?

 

I don't feel it but light on while warming and at idle. It will accel fine and no noise or tells of hemi tick

 

Have you tested the coil/injector connectors with a noid light? (verifies that the PCM is actually trying to control them.) Tried swapping injectors/coils, to see if the miss moves with either one? What plugs did you put in? And are they the manufacturer recommended plugs?? ( know the older motors have real issues with the rare-earth fellers.... not sure if the newer hemis have the same issue...... 16 plugs, right?

 

I have swapped coils and all coils work fine. I haven't tested the wires to injectors though. What tool was it needed to do that again?