Hello, I have a 2002 Ram 2500 with the 5.9 magnum and when I go over 45 and give it gas, around 2100 rpm it starts pinging, All my fluid levels are good, and they are all clean. Does anyone know what could cause this?

 

Fixed the plenum yet? How old are your O2 sensors? How many miles on the truck?

 

I have not fixed the plenum, the 02 sensors were replaced 30,000 miles ago, and it has 172k miles

 

What brand O2 sensors? I would have a look down the throttle body, and see if there is oil pooling in there.... (see the stickied plenum thread at the top of this forum.)

 

It was bosh, and i will take a look at throttle body

 

These trucks don't much care for Bosch sensors.... NTK or Denso only please.

 

I just checked and i don't see any oil pooling

 

I will replace them and see if that helps

 

Reset the computer as well. It likely learned some bad habits with that bosch sensor in there. The sensor after the cat isn't quite so critical, but, you want the pre-cat sensor to work right. Bosch doesn't do that.....

 

Many things can cause pinging: oil leak, vacuum leak, old plugs, fouled plugs, broken plugs, wrong plugs, low octane gas, bad gas, carbon buildup on valves or pistons, plugged cat, bad O2 sensors, wrong O2 sensors, weak water pump, wrong water pump, weak radiator cap, wrong radiator cap, pcm tuning, bad pcm tuning, "generic" pcm tuning, bad coil, bad distributor, bad distributor cap and/or rotor, bad spark plug wires, wrong spark plug wires, wrong spark plug wire configuration, etc. Not to mention Dodge never included knock sensors on these (or any of their engines).

Start with the easy stuff: check for the aforementioned plenum leak, run a carbon cleaner like seafoam, change the plugs, check the wires to ensure they're routed correctly, check the cap and rotor, put in a little higher octane and run it good and hot with a load preferably, keeping it out of overdrive if so equipped. Report back.