turbo-fever Posted October 24, 2015 Share Posted October 24, 2015 I cannot seem to cure the misfire I am having at 6k rpm, I have read about using cheaper plugs as at the moment I have iridium heat range 7 is this true ? Quote Link to post Share on other sites
Whitenoize Posted October 24, 2015 Share Posted October 24, 2015 I cannot seem to cure the misfire I am having at 6k rpm, I have read about using cheaper plugs as at the moment I have iridium heat range 7 is this true ? they should be fine mate dont think your problem will be the spark plugs Quote Link to post Share on other sites
glanzadude Posted October 25, 2015 Share Posted October 25, 2015 I think you have a air/exhausted leak Quote Link to post Share on other sites
daniel_g Posted October 25, 2015 Share Posted October 25, 2015 Have you changed the MAP sensor? Quote Link to post Share on other sites
Idrees Posted October 25, 2015 Share Posted October 25, 2015 I recently had a similar issue, turned out to be a faulty HT lead Quote Link to post Share on other sites
Stu Posted October 27, 2015 Share Posted October 27, 2015 Iridiums are ok but are not as forgiving for overfueling as normal plugs. They tend to be harder to clean once they have had a good overdose of fuel. I tend to run BKr7e's gapped to suit the application. Have been using them for years and never had an issue, $7 a plug is also a bonus. Quote Link to post Share on other sites
turbo-fever Posted October 27, 2015 Author Share Posted October 27, 2015 I have changed the map sensor, there is a tiny crack in mani which is being welded up monday.Is there a way of checking the he leads ? Quote Link to post Share on other sites
5e colin Posted October 27, 2015 Share Posted October 27, 2015 ya using a multimeter and check the ( oms ) ( homes ) however u spell it you can look online for plugleads readings Quote Link to post Share on other sites
gorganl2000 Posted October 28, 2015 Share Posted October 28, 2015 Iridiums are ok but are not as forgiving for overfueling as normal plugs. They tend to be harder to clean once they have had a good overdose of fuel. I tend to run BKr7e's gapped to suit the application. Have been using them for years and never had an issue, $7 a plug is also a bonus. i'd suggest you follow stu's advice....its possible the boost is blowing out the spark at high rpm/boost, which is making the car "miss" what is the gap you currently use and how much boost are you running for higher boost a gap of 0.6 - 0.8mm maybe necessary Quote Link to post Share on other sites
turbo-fever Posted October 29, 2015 Author Share Posted October 29, 2015 Tried gapping from .56 all the way to .8 and still does it Running about 1.1 bar Quote Link to post Share on other sites
Stu Posted October 31, 2015 Share Posted October 31, 2015 You've re-gaped your iridium's or are you talking about a standard set? At 1bar (piss all boost) you shouldn't need to gap them down at all. Out of the box the BKR7e's are usually between 0.8 and 1mm anyway. Have you checked the leads out? Just measure the resistance end to end using a multimeter. They all will vary due to the different lengths but you should see a pretty similar step in resistance as the length gets longer. Quote Link to post Share on other sites
gorganl2000 Posted October 31, 2015 Share Posted October 31, 2015 well i beleive you should look at the rest of your ignition components ----plugs, leads, coil, ignitor and the wiring do you have a friend close by that you can swap parts over one by one and test? or a multimeter? did your diagnostic show anything? Quote Link to post Share on other sites
turbo-fever Posted October 31, 2015 Author Share Posted October 31, 2015 Ive gapped normal plugs and the iridiums . Bussey lent me his leads which we know work as they were on his car that didnt work so all that's left now is coil.What make of dizzy is a genuine one that toyota use ? Is it a bosche one, as a friend said if it isn't a genuine one or its a patented one then that might be the cause Quote Link to post Share on other sites
Turk Posted November 2, 2015 Share Posted November 2, 2015 i had a similar problem and my coil was rusted which made it have a bad eart. cleaned it up and its good as gold now Quote Link to post Share on other sites
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