OK so I have a 1995 Dodge Ram 1500 5.9 and I just replaced the plenum plate with the hughes kit and that made a huge difference performance wise and got rid of my annoying lifter tick. I also thought it would get rid of the spark knock/pinging too, but it still persists... I have ran two cans of seafoam, 1 can of CRC engine treatment, and 2 bottles of techron and it still pings above 2200 rpm and gets worse the higher the rpm and in OD under load. I feel like I have tried everything, I have 3923 plugs, 180 thermo. Please let me know what I can try because I don't want to ruin my engine that has only 60k miles.
Thanks

 

You mean 3293's? Are am I wrong?

I experience the same pinging, although not a full 100% of the time. But, I did experiment and I get NO pinging at all with premium gasoline, 97 octane or whatever the hell it is around here...

 

Not going to look up plugs, but if they are not standard plugs, change them.

And put the 195 stat back in it. Engine is not getting warm enough. Need a tune to run 180.

 

Yes I meant the 3293s sorry, and you think if I put the stock plugs back in and the 195 the pinging will go away? Because I always heard that the cooler plugs and tstat help pinging

 

180 stat without proper PCM programming to accommodate it will make engine temp lower than what the PCM is wanting to see. These engines do not respond as well to "high end" plugs. They like the standard copper ones.

 

I have the autolite 3293s which are highly recommended on this forum. They are standard copper plugs, I really don't think the 180 would make my engine ping. everyone says it helps prevent it, maybe my egr is going bad? And also does spark plug gap make a difference on ping? Mine is set at 0.35

 

If the AL 3293s are the std copper, you should be good there. I don't change speak plugs often, even on a lot full of vehicles I have, so I don't keep tract of the numbers. All I know is the engine is NOT designed to run at 180. SCT reprograms PCM to make this work at 180. But if you don't think its a problem, its your truck.

 

I mean I guess I will try the 195, but if that doesn't work I'm baffled

 

I've been doin my research and I think I found the issue. A faulty egr valve. Will cause pinging under load and such, hope I can figure out how to replace it or check to see if its bad. Any suggestions?

 

The # is 3923, not 3293.