I recently got new plugs, wires, distributor, cap, and rotor for my D16Z6. I pulled the plugs out and there is a black sooty type powder on them. The electrode doesnt look messed up. They are 1 range colder then stock and I have them gaped to 41. Should I size down the gap? Runnin rich? Motor prob? Any help is much appriciated. Thanks

 

No one knows? Tough to belive.

 

black sooty deposits may indicate an improperly tuned vehicle. excess carbon makes the plugs black. a normally worn plug will be gray or have light tan deposits. check your air filter and ignition components to make sure that they are in good working order