JayJay1374 Posted May 7, 2017 Share Posted May 7, 2017 Hi everyone. Currently having a misfire problem and it's getting the better of me. Misfires on boost over 1bar, bpu car running 1.2 normally. If I control the throttle and don't go full throttle it's ok as long as it's below 1 bar. So late last year I developed a misfire running ngk bkr7eix plugs. Fast forward to this year and I still have the misfire (the car was off the road over winter). Anyway so I changed the plugs for a set of BKR8EIX and alas the misfire was still there. But it was different. The misfire seemed to stay between 3500-5800 rpm then pick up as normal after. So I went to fueling next. The car has had the 12v fuel pump mod done with a relay. To rule this out I removed the relay and returned to standard. I also changed the plugs to denso ik22's so I'm back in the 7 heat range. So the misfire disappears. Awesome! Well it returned a week later. So I've checked the plugs (seem ok). Tired my old bkr7eix in and still a misfire, checked all the wiring I altered removing the 12v mod. All ok. I've changed the fuel pump ecu. Again no change. I've even tried changing the fueling back to 12v and still no change. I want to get a multimeter on the pump and make sure it's defiantly getting the correct 9v at idle and I will bridge the obd port to check the 12v supply. Have I bought the wrong plugs? Ik22's? The only thing that changed was the plugs and 12v mod. Any help or advice is appreciated. Quote Link to comment Share on other sites More sharing options...
squiffy Posted May 7, 2017 Share Posted May 7, 2017 your first paragraph describes exactly what mine was like. a set of coil packs fixed it Quote Link to comment Share on other sites More sharing options...
jcbt Posted May 7, 2017 Share Posted May 7, 2017 Check coil packs and clips as most misfires are related to these items Quote Link to comment Share on other sites More sharing options...
peter richards Posted May 7, 2017 Share Posted May 7, 2017 do the clips first as its the cheaper fix if its still missing then the coil packs Quote Link to comment Share on other sites More sharing options...
JayJay1374 Posted May 8, 2017 Author Share Posted May 8, 2017 I forgot to mention I did the clips last year as they where looking worse for wear. Gonna try and borrow a set of coilpacks off one of the local lads. Give them a go. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 8, 2017 Share Posted May 8, 2017 The "clips" are just the plastic body holding the actual terminals, have yiou cut back a little way into the coil pack loom and fitted new terminals that you can buy from Toyota with factory crimped on wire tails? I would do that next, and if there's no improvement get the HT traces looked at on a scope, unless you feel lucky and diagnose by throwing bits at it The coil loom terminals should be considered service items these days. Quote Link to comment Share on other sites More sharing options...
JayJay1374 Posted May 9, 2017 Author Share Posted May 9, 2017 Chris I did fit replacement terminals when doing the clips as my wiring looked worse for wear. Ok so I have borrowed a known working set of coilpacks of safcdixon and it runs perfectly. No miss at all. So next port of call is to swap 1 coilpack out at a time to see if it's just 1 or a mix of a couple and after that source replacements. Quote Link to comment Share on other sites More sharing options...
jcbt Posted May 9, 2017 Share Posted May 9, 2017 Chris I did fit replacement terminals when doing the clips as my wiring looked worse for wear. Ok so I have borrowed a known working set of coilpacks of safcdixon and it runs perfectly. No miss at all. So next port of call is to swap 1 coilpack out at a time to see if it's just 1 or a mix of a couple and after that source replacements. Good to hear it's fixed and not surprised it's coil packs but would suggest you renew them all if you can. Quote Link to comment Share on other sites More sharing options...
JayJay1374 Posted May 18, 2017 Author Share Posted May 18, 2017 So after swapping 1 out one at a time I have 2 faulty coils. One more so than the other. Managed to source a good working clean set of coilpacks locally so I'm sorted for now and have 4 spares. Quote Link to comment Share on other sites More sharing options...
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