yoss Posted January 20, 2018 Share Posted January 20, 2018 Hi everyone I have a imported 1998 Version 4 imported STI 4door, i have developed a misfire between 2-4k rmp on full throttle, seems to occur on full boost and clears once above the effected rev range. once above 4k it pulls like a train but it seems to drop into a misfire whilst building boost. Ive cleaned the MAF/checked all silicone joiners, it has got iridium plugs/standard intercooler/standard recirc BOV and Ive cleaned all of the visible electrical connections. Any suggestions/common failures?? it has covered 160,000 miles with replacement head gaskets/skim heads 4,000 miles ago. never had any running issues before and i am scratching my head as to why its happening now! Cheers Yoss Quote Link to comment Share on other sites More sharing options...
Tidgy Posted January 20, 2018 Share Posted January 20, 2018 checked the spark plugs? also could be a lead/coil pack issue Quote Link to comment Share on other sites More sharing options...
yoss Posted January 20, 2018 Author Share Posted January 20, 2018 Yeah I will change the plugs, its got Iridium ones in at the moment. (not a great fan of those) but shall fit normal NGKs and see how it goes. Thanks Yoss Quote Link to comment Share on other sites More sharing options...
Tidgy Posted January 20, 2018 Share Posted January 20, 2018 NGK pfR6 for normal, pfr7 for tuned are the norm Quote Link to comment Share on other sites More sharing options...
yoss Posted January 20, 2018 Author Share Posted January 20, 2018 Cheers will pick some up tomoz.. Quote Link to comment Share on other sites More sharing options...
yoss Posted February 11, 2018 Author Share Posted February 11, 2018 Well I bought a set of plugs, and some injector cleaner. Decided to use the cleaner first to see if it made any difference and after adding it to a couple tankfuls the problem has gone!! Will fit the plugs at a later date. So all good.. Cheers Yoss. 1 Quote Link to comment Share on other sites More sharing options...
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