My apologies, when I think pinging I think clicking and higher pitched sounds but both knock and ping are much the same I suppose. The sound i intermittently get is like marbles in a can on hard acceleration just for a few seconds and can't repeat it on demand (like bad ball joint popping turning every time into a driveway). On the VVTI gear I pulled the "allen" bolt and assembly off to do the oil seal and after reassembly I noticed play in the gear before it turned the cam (I had the VCs off). From what I gather, but could be grossly mistaken, the VVTI valve hydraulically fills the compartment in the VVTI gear depending on engine demand for cam oil distribution similar to a BMW vanos system. My thoughts where if I didn't position the gear properly than I may be starving oil distribution to produce the sound.
I am now on maybe the 5th tank of gas and usually put in 87 and drive it hard. When I first got the car it was neglected driven by a retired couple, leaking oil from the top end and leaking antifreeze from the o-ring from the WP to block connection which prompted in a basic top end and TB refurb.
**RE-EDIT** Correction, I can make the sound on demand, when I am driving and mash the pedal I get a quick low octave clickity clack kind of slack being taken up before power is produced. And when I do get gas I get it from where ever it is convenient, next time I fill I'll opt for the high test and see if there is a difference and report back.
Last edited by Patiolamp; 06-05-2019 at 10:42 AM.