Shazad Posted February 9, 2016 Share Posted February 9, 2016 Hi I have a Subaru Impreza wrx Classic 1997 import just deciding on what spark plugs to get as top end is misfiring Badly .. Taken out the pfr6b and put in the ngk iridium spark plugs ( this made it a bit worser as I'm getting a bit of a misfire on idle and on low revs low gears). Spoke to a specialist and he said I suggest you put a set of platinum spark plugs in . He said the ngk iridium are no good on these model cars? Is he right ? what spark plugs shall I go for ? pfr6b or pfr7b ? The only upgrades ive done on car are decat down pipe and a hks or filter . Any suggestions please .. Quote Link to comment Share on other sites More sharing options...
GeoffLeggy Posted February 9, 2016 Share Posted February 9, 2016 Has the car been mapped? When were the mods you mention carried out? Quote Link to comment Share on other sites More sharing options...
Shazad Posted February 9, 2016 Author Share Posted February 9, 2016 Hi the car has not been mapped the mods were carried out a month ago .. Quote Link to comment Share on other sites More sharing options...
GeoffLeggy Posted February 9, 2016 Share Posted February 9, 2016 Im just trying to see if there is a pattern with your decat and the issue. It is mostly recommend to have a remap after decatting. You might just need some ignition tweaks etc on a rolling road session. You could try all sorts of plugs but you might not resolve the issue. See if anyone else has any suggestions. Quote Link to comment Share on other sites More sharing options...
Shazad Posted February 9, 2016 Author Share Posted February 9, 2016 thanx geoffleggy Quote Link to comment Share on other sites More sharing options...
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