Do a compression test to determine condition of engine internals
NGK Iridium spark plugs are fine for your 1996 Honda Accord.
where are the plugs located
Four
A 1998 Honda Accord is tuned-up by replacing the spark plugs, fuel filter, air filter, and cleaning the injectors. Changing the motor oil and transmission fluid are often changed at this time as well.
As for NGK or Denso OEM spark plugs.
1994 Accord is OBD1 not OBD2. Under dash, driver's side.
Honda recommends every 100,000 miles.
Screwed into the head.
NGK is an excellent plug for your Honda and is the OEM plug. But you can also install Denso plugs.
NGK or Denso.
Screwed into the head or heads on a V6.
They are right there on the top of the engine.