Issue maybe with 55?
but everyone recomends using OEM plugs.
it is useful to change them every 2nd service. which is every 20,000. but again, depends on how you drive. and the timein the year. summerr = hot air = wear off more
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shouldn't reach $100. it depends from place to place.
here in UAE i can 1 OEM plug for about $10. so about $80. but then. you have labor charge.
there is a thread about how to change them i think. chak the sticky threads under DIY
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WTF. our dealer change them every 2nd or sometimes 3rd service.
but again. our heat may cause it to wear out fast.
dunno.
i just have to go with what they say, so that they don't blabla bla about warrenty and other things
stealers not dealers.
Your A/F ratio likely was maladjusted during the tune, and like you said, probably on the rich side.
but the tuner did that. because it showed that there light engine on. indicating low fuel pressure. he said mine was the first one that he had to do it after tuning ><






