This isn't on a Honda, it's on my wife's 1996 Toyota Corolla, which has a 1.8L engine, pretty similar in technology to the early OBD-2 B18B engines, except it just rotates the opposite way

Anyway, it's been having a problem with pinging when lightly pressing the gas pedal for awhile now. I tried running some Seafoam through one of the vacuum hoses, but the problem still persists. I may try it again because I think I didn't use enough of it last time.

But is there anything else I can do short of pulling the head off and cleaning out the carbon? I even tried running some 89 octane fuel for a couple of months instead of regular 87, and even that didn't help.

 

get a lubro moly intake cleansing treatment to try and get rid of some of that carbon built up inside.

seafoam should do the same thing.

make sure your timing is set correctly. if too advanced it will ping all day

for ***** and giggles throw in some 94 oct. if it still pings its prolly just a marble rattling around in your engine bay

you try changing out the spark plugs? they might be in too hot of a range for the motor

 

yea I changed them recently with whatever the local parts store said was correct for the car.

I'll try the Seafoam thing again, and will try a tank or two of 93 octane fuel.