3.0L V6 pings at low RPM

[The Person]

First time posting

I have a 2005 Ranger xlt with the 3 litre vulcan mated to a M5OD that recently developed what sounds like low rpm detonation. It has 147,600 on the clock. It only makes the noise when it is warmed up, and only below 2000rpm. I have recently replaced the coil pack (old one was cracked) and cleaned the MAF. The new coil pack did seem to reduce the intensity of the noise. Cleaning the maf made no difference. It hasn’t thrown any codes as of yet. I know vulcans are prone to pinging so is this normal or should I be concerned?

 

[4.0blue98]

Just to rule out a carbon knock, I'd try some Techron or I've recently had some luck with this stuff from HotShots called gasoline extreme. I've only tried it once but it made a difference with the next tankful. Made it worse for the tank that I added it to, but then was much better after the next fill. I usually have to decarbon mine twice a year and I do the decarbon protocol in the TSB. I'm due again. I get the PM3 from the dealer.