Marshffs Posted February 22, 2018 Share Posted February 22, 2018 Hello all, my 2001 wrx is due a service, at the moment it has an intermittent missfire type problem, bogging down etc. It doesn’t do it all the time and im assuming its the plugs but im changing them anyhow as part of the service. Question is, would you recommend NGK PFR7B and do they come pre gapped? i have no CEL light in the car either. Steve Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted February 22, 2018 Share Posted February 22, 2018 Heat 6's are what most use in stock scoobs and generally, heat 7's in mapped with bolt ons . If your running over stock boost tighten the gap a little to 0.65mm, to lessen the chance of spark being blown out by boost . Otherwise i think they're 0.7mm outta the box Check your coilpack insluation and wires for cracks , seeing as you have a minor misfire [emoji6] Quote Link to comment Share on other sites More sharing options...
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