Hey Hey,
I just had the same problem with a Bosch platinum on the #4 cylinder, blew out the electrode. I've run that brand for the last 100k, not the same ones of course, but have been very happy with them. The engine was running horrible with the check engine on and sometimes flashing. Had it flatbedded to the dealership who said the plug was bad (could of been a stealership and really nailed us). The service writer told us not to run platinum plugs in the car. 97 Impreza with 2.2 - the plug was just the regular platinum, not the ones with the extra electrodes - Hats off to Don Miller Subaru in Madison, WI on this one! tow bill $116, dealer code check and new plugs $85 - Doh!!!
