2005 Dodge Ram cylinder coils

OK if you would call you local parts stores and see if one does a free scan and scan it write the codes down and then have them clear them and get back to me with the codes. I need the P? Codes so I can help you with this problem. Get back to me with that and we will go from there.

OK it could be the plugs it could be the coils again or it could be the injectors. The codes say it is a missfire but not what is causing it so that is up to us to figure out now. So pull the plugs and check them if they look questionable then go back to the factory plug which it champion plugs and get the platnum ones ok. Now as for the injectors and coils lets do an ohms test on them. Coils should be checked at 70 to 80 degrees and if you unplug them the resistance should be between terms.6 to.9 ohms. Now the injectors just unplug them and check ohms across the injector terms and let me know what you find for ohms here. Also check the coil on boot for ohms of resistance and let me know how they ohm out. Now if this all checks out then I would like to check the auto shut down relay circuit and I also need to know what engine you truck has. Get back to me with what you find.

Ok I never assume that because one thing fixes it for short time that the problem is alway's the same. These are what can cause an engine missfire and as a mechanic I diagnos twice and replace once I don't like come backs unless it is for another problem not the same problem. Now that I have the engine size I can look up the proper resistance for you when you get me the ohm's of resistance on the coils and injetors. Now to check the resistance you need a digital multi meter and you set it on the 2K scale and then you unplug the coil and hook up the meter between the terminals on the coil itself (not the wire harness) and let me know what it reads. Then do the same on the injectors. I would check each cylinder sense you are getting a P0300 code. Now as far as using champions over bosch it is like this. The Dodge used champions from the factory so as I see it that is what plug the factory tuned the ignition to so it should work best. Also I have used bosch in my Mustang and my other cars figuring it was an inexpensive platinum plug and and developed a P0300 code in each pull the plugs and went back to factory type plug (autolite in this case) and problem solved so this proved my thoughts on this. I now run E-3 diamond fire plugs and they are working great better mileage and power and no missing but they are not cheap they cost like 7 dollars a plug. I hope this helps explain why I use the factory type plug. Get back to me with coil and injector test and we will go from there. I may need you to pull the two coils that you replaced to check the boots on the end of them again you will check the resistance of them. Let me know what you find.

Ok after you change the plugs and get the codes get back to me with that and let me know what the ohms are on the coils and the injectors and we will take it from there.

Ok that sounds good.