Victor520

If you tap on the cat you can hear if its coming apart because it will rattle. By popping are you saying the engine is back firing? Did you crawl under the truck while its running to hear where the grinding is coming from?

Thank you for your help and i did so , but it didn't work

this is the code table : code table, hope it can help you

Ok here is the run down my causin got a truck like mine i have a 96 dodge ram but his is a 94 5.2 1500 4x4 ok we did the spark plug wires because the old ones were arcing but if u stop on the gas it makes a loud popping/grinding noise but if you ease on the gas it can go up to 5000 easy with out popping or grinding i was thinking it was a bad cat or torque converter but i need some ideas so i can help him i feel bad because its his only vehicle thanks for the help. and if i want to solve it by myself , does the tool nexiq 125032