Tricky-Ricky Posted May 19, 2006 Share Posted May 19, 2006 Just when i thought all problems had now been resolved, i get another! thought i noticed a very slight shudder the other day, now its turned into a misfire very noticeable at idle, tried pulling the coil pac connections with no real effect very odd! the only things i can think of is either it doesn't like the emanage, or the plugs are sooting up, colder and i do a lot of town driving, i must say i have never had a car thats given me so many problems, beginning to wonder if i should have stuck to my Nissan! any ideas? Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 20, 2006 Author Share Posted May 20, 2006 Oh well! just have to reply to my own threads! do i use the wrong virtual deodorant or something couldn't get a reply to my last thread either? just as well i can do my own troubleshooting:p but some feedback might have been good! anyway after ploughing through a lot of threads on the Supraforums, i found that an idle misfire is quite common on a BPU car, sometimes it can be cured by re-gapping or changing plugs, and sometimes not. Link to comment Share on other sites More sharing options...
Robert Posted May 20, 2006 Share Posted May 20, 2006 also mate i think Ian C did a thread about the gap in the coil pack wires becomes to large and he shows how to re gap them. Link to comment Share on other sites More sharing options...
Robert Posted May 20, 2006 Share Posted May 20, 2006 http://www.mkivsupra.net/vbb/showthread.php?t=61141 Link to comment Share on other sites More sharing options...
supra matt Posted May 20, 2006 Share Posted May 20, 2006 not more problems mate ! looks like you should of brought mine after all lol. But im clad u did not now im loving it just come back from jap fest and had a play with some evo 6 7 and 8 and did them all :-) . hope you get it sorted soon mate . Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 20, 2006 Author Share Posted May 20, 2006 Thanks guys, think i may have solved the misfire, by re-gapping the plugs, I'll give it another couple of days just to be sure, and if that doesn't do it I'll get some new platinum ones, so onto the next problem! known about this for a while, no two tubby is not doing its bit, so i think I'll start with the TTC mod to see if it actually works, and then check all the VSVs and pressure tank. Link to comment Share on other sites More sharing options...
Gamer Posted May 20, 2006 Share Posted May 20, 2006 I would not use Platinum plugs mate... Only Iridium ones. My understanding of the Platinum ones are that they are more geared to long life rather then durability under higher then normal boost (Which I am assuming you are running with the boost upped a bit) Of course I could be totally wrong. Link to comment Share on other sites More sharing options...
bedlam Posted May 20, 2006 Share Posted May 20, 2006 DO NOT use plats on your car..like Joe (Gamer) says they are only there for longer life..and platinum plugs will hold heat longer than copper ones..so either iridium or copper. Andy Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 20, 2006 Author Share Posted May 20, 2006 Sorry but i won't run Iridiums, as a personal preference, due to seeing to many engine problems, imo they are to fragile when it comes to coping with detonation, always used platinum on past cars with no problems, using copper core at the moment. Link to comment Share on other sites More sharing options...
osso Posted May 20, 2006 Share Posted May 20, 2006 Do you get a pisssssh sound when you disconnect the pipe going to IAVC VSV from the main pressure line? that'll be the first thing i'd check, if you do then you should be able to configure it into TTC mode, without the pressure you wont be able to open up the EGCV. Link to comment Share on other sites More sharing options...
bedlam Posted May 20, 2006 Share Posted May 20, 2006 well i dont like irdiums myself but running plats in a bpu supra isnt a good idea as no one likes the heat retained by the platinum content on the plug holding onto the heat for to long. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 20, 2006 Author Share Posted May 20, 2006 Where does this retaining heat come from?? plugs are designed to work at certain temperature ranges! hence the number rating! it makes no difference weather its a copper core, platinum or an iridium, the number dictates the designed heat range of the plug, which is achieved by a combination of electrode length, electrode projection and type of ceramic insulation! the only difference is the metal and size of the electrode, and they are only precious metal in order to prolong service life, admittedly some types work better on some engines than others, hence my comments about iridiums being fragile when subjected to detonation Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 20, 2006 Author Share Posted May 20, 2006 Do you get a pisssssh sound when you disconnect the pipe going to IAVC VSV from the main pressure line? that'll be the first thing i'd check, if you do then you should be able to configure it into TTC mode, without the pressure you wont be able to open up the EGCV. Did a few recommended checks, but i'm not certain i did that, will have a look:) Link to comment Share on other sites More sharing options...
bedlam Posted May 21, 2006 Share Posted May 21, 2006 Emm platinum does NOT dissapate heat very good..and copper dissapates heat very good which is why you dont use plats in a bpu car. 1f you want me to find you some supra guys that have lost there engines due to using plat plugs i can..infact if you look on the NZ supra site you'll find lots of info on there why you dont use heat..and i'm sure there arent many on here that use plats. Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted May 21, 2006 Author Share Posted May 21, 2006 Ok fine! but using the same criteria i can find you plenty of people who have lost there engines due to using iridium plugs! as i said the heat range of a plug is pre designed by the size (which is why platinum and iridium plugs use very small electrodes as opposed to copper) projection and insulation, my reason for not using iridium may be similar similar to yours for not using platinum! iridium plugs use the smallest electrode followed by platinum then copper core, my feelings (and others) are that iridium electrodes being so small are more easily damaged by detonation, which in turn cracks and sometimes breaks the ceramic insulation, which is what causes the engine damage, i'm presuming that you are quoting platinum electrode plugs as melting due to heat retained, for the engine damage?? in general pugs no matter what the composition seldom melt unless its due to the wrong heat range being selected for the aplication, or they are subjected to detonation, which is by far more responsible for turbo engine damage than any other reason! can you give the circumstances under which these engines where damaged by using platinum plugs? Link to comment Share on other sites More sharing options...
JohnA Posted May 21, 2006 Share Posted May 21, 2006 I've never had problems with NGK iridiums. Seen or heard of a few melted tips but these were DENSOs As for heat 'retained' that has to do with the heat *grade* of the plug. Link to comment Share on other sites More sharing options...
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