guess at around 50k miles since last plug change.
Figured it was time to take a look at plugs. Pulled #1 and #3. They are different...
Not only are the plugs different, note different heat range (#1 has the '6' hotness and has buildup on the ceramic)...they are fairly equally gapped to around 1.4-1.5mm
Anyone running mismatched plugs to maybe deal with the wasted spark uneven wear on platinum plugs?
When I first bought the car it had misfires that got worse when it was wet and going down hills with no throttle at highway speeds. Haven't had a misfire in a while. #1 plug socket on the coilpack is pretty corroded (carbon arc damage) but the metal contact seems fine.
Edit: Misfires may be phantoms...car doesn't stumble, the only way to tell is the CEL.
#1 plug has arc damage on the ceramic insulator. This might mean a new set of plug wires or will a dab of dielectric grease help this?
BTW it isn't too bad to get these plugs out from underneath with the front end jacked up. For installation I think I'll try feeding them in snugged on a scrap 5/16" fuel line.
My owner's manual says to use PFR5B-11. I have a set on hand. I think running hotter plugs will clear the buildup on the #1 plug and may help the misfire issues.
Edited by 89Ru, 15 December 2012 - 08:16 PM.