I have a 99 ram1500 64000 miles it runs great gets 14.9 mpg but pings all the time with 87 same with 89 and marginaly better with 93 andoctane gas could this be a result of ethanol? I do not know if it uses oil or not yet I just bought it a few weeks ago. Is there a fix to this?

 

search for plenum fix this is prob your problem

 

what plugs are you running?

 

Plenum

 

I think it has never had a tune up so I would guess a stock factory plug

 

I have the same problem and was told the injectors need cleaned on my 5.9

 

ok went home started it up and pulled the hose onm the pcv it is sucking hard but little to nooil in the plenum any guesses?

 

p p p plenum

 

My vote is plenum.


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ok I found the pcv valve was stuck so I replaced that also found an air cleaner that looked like a scrub pad for a corn field(very dirty but not oily) I took it for a ride up the road there was a definate effect. I was down to a quarter tank filled it with 93 from a gas station out of town and wow what a diffrence little to no ping and out of 750 miles no noticeable oil usage could it just be bad gas from the station I use all the time? or is it still the plenum?