Hey guys and gals,
I have inherited a 2005 Dodge Ram 1500 with the 4.7l Magnum engine. It is my daily driver and I invested a ton of time and money in the rig. I did the whole front end suspension, steering, brakes, transmission cooler, radiator, water pump, hoses etc. I love this truck… but I have been chasing p0420 and p0300 codes before swapping the bank 1 cat out for a new one, which fixed that issue of the 0420. I still have the p0300. I have new plugs, new coils, crankshaft, camshaft and throttle position sensors, fuel pump and all injectors. Some of this work for other codes issues along the way. But I get a p0300 code every now and then. It will stay on for a day or maybe just a couple of hours and then turn back off, and eventually come back.
I don’t know what to do anymore… I would greatly appreciate y’all’s feedback.

thanks

 

What plugs did you put in it? If they are 'rare earth' plugs, might wanna swap those out for some standard coppers.

 

I put in champion 33182 platinum 0.040”. I ran champion regular copper for like 6 months before these and had the same issue

 

I still have those copper plugs, they have maybe 4000 miles on them, should I switch back to those?

 

Worth a shot....... Do you have a scanner that will read misfire counters? Knowing which cylinders are misfiring might be enlightening.

 

Unfortunately no, any recommendations? I have a Foxwell NT-301

 

I haven't been keeping up on that kind of thing, as there are so many out there now, all with different capabilities..... That, and I don't do 'hands on' anymore either....... Buddy of mine has a rather nice one, but, I think he spent 1000 bucks on it too......

 

Ugh, for a thousand bucks it better be nice, lol. I’ll change the spark plugs back to copper and while in there do a compression test?

 

Wouldn't hurt.