jevansio Posted July 3, 2010 Share Posted July 3, 2010 My intermittent missfire is back, I thought I sorted it by replacing the coilpack connectors but sadly not. Since the missfire seemed to be coming back I thought I'd elliminate some stuff. 1st I identified which cylinders, it appeared to be 2 & 5. The missfire would go in a cycle, it would be fine then 5 would drop, then 2 & 5 would drop, then it'd clear. This would happen regular as clockwork every 15 secs or so. So I swapped coilpacks around, problem remained on 2 & 5. So I swapped plugs around, problem remained on 2 & 5. So I swapped injectors around, problem remained on 2 & 5. Does this sound like the AEM injector drivers are going funny? Also my AFRs seem to wander around in exactly the same cycle (even before the miss starts, but also as the miss is occuring), they'rr 14.7 for 15 secs, then swing lean then rich, then return to 14.7. Any help appreciated Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 3, 2010 Author Share Posted July 3, 2010 (edited) Also just been out & unplugged the DLI, still remained. Any chance it could be the injector resistor pack, it look a homemade thing made by Michel when the single conversion was done, not a UK spec one, it's damn hot (it's in the passenger footwell not the engine bay)? Does this tie in with the fact it seems heat related? Does the UK spec pack have that cover on as a heat sink? Edited July 3, 2010 by jevansio (see edit history) Quote Link to comment Share on other sites More sharing options...
Terminator Posted July 3, 2010 Share Posted July 3, 2010 (edited) I have my UK pack which I am going to sell, if you want to borrow it you are welcome. It was working well came out of the car last week. Can you log this on your AEM? Edited July 3, 2010 by Terminator (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 3, 2010 Share Posted July 3, 2010 Have you got access to a laptop oscilloscope gizmo? Then you can read the waveform at the injectors themselves and at the ecu outputs. Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 3, 2010 Author Share Posted July 3, 2010 I have my UK pack which I am going to sell, if you want to borrow it you are welcome. It was working well came out of the car last week. Can you log this on your AEM? Phil thanks for the offer, veyr kind, I will let you know shortly bud Have you got access to a laptop oscilloscope gizmo? Then you can read the waveform at the injectors themselves and at the ecu outputs. Way beyond my abilities Chris, I wouldn't know what I was looking at, maybe I can ask someone at work as they are that way inclined Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 3, 2010 Author Share Posted July 3, 2010 OK so I pulled the resitor pack into the open air & went for a run, it stayed coolish to the touch, then it started missing again I got home & opened the resistor pack up, it contains 3 resistors each must control 2 cylinders. Is that too much of a coincidence considering I'm seeing a missfire on 2 cylinders? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 3, 2010 Share Posted July 3, 2010 I would imagine a resistor capable of handling the current would be wire wound, and either OK or open circuit, I don't see how one could come and go, but electronics isn't my thing Is the coil dwell time OK? When it plays up again can you swap the outputs of the ecu injector drivers over? I know that sequentially they won't fire in the right sequence, but you probably wouldn't notice difference. That way you could tell if the ecu was dropping an output. Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 5, 2010 Author Share Posted July 5, 2010 Thanks for the input Chris, although I decided to eliminate the resistor pack 1st by moving the injector signals onto another resistor to see if the problem moved from cylinders 2 & 5, and it did, went to 3 (didn't bother checking the other one). I'm pretty sure it's the resistor pack now, I'm getting a one from Phil to try this week so should know soon enough for sure, Thanks anyways Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 7, 2010 Author Share Posted July 7, 2010 OK, put the new resistor pack on from Phil, problem was still there , back on 2 & 5. I must have been mistaken when it went to 3 as after the the miss degenerated into a worse state which was hard to identify which cylinders were going down (it seemed like all them). Anyway I wondered if the RLTC was playing up, so I cut it out the loom & soldered the injector wires back together, it seems to have sorted it. Not sure whether the RLTC is getting funny abs/rev signals, or it's not grounded/powered properly, or if the box is just fecked, but I will track that one down at the weekend. For now (touch wood) I'm just happy the miss seems to have gone Quote Link to comment Share on other sites More sharing options...
Stonkin Posted July 8, 2010 Share Posted July 8, 2010 Good news mate hopefully you will find the issue with the rltc to. Quote Link to comment Share on other sites More sharing options...
Matt H Posted July 8, 2010 Share Posted July 8, 2010 Probably won't help much, but I had a miss fire problem that turned out to be a problem with the crank sensor. Another one was simply plug heat rating. Temp seemed to play a part with my issue. Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 10, 2010 Author Share Posted July 10, 2010 Well the missfire is finally gone, it wasn't the RLTC, I had that totally out of the loom & the missfire was still there. I went over Hoidges & he had a look, he noticed that the ignitor that I had relocated to the passenger footwell was roasting, he told me to mount it where it could be cooled, so we tried it & hey presto it was gone. I also tried his ignitor which seemed to behave better than mine so I'm on the look out for a spare one to try incase I have fried mine with too much heat So I'm happy again, many thanks John, much appreciated Quote Link to comment Share on other sites More sharing options...
hodge Posted July 10, 2010 Share Posted July 10, 2010 ohhh yeah, who the daddy whos the daddy, lmao. No sweat jay. Another happy supra owner from SBA-Tuning. Lets hope it gets you into the 11s at suprapod mate. Quote Link to comment Share on other sites More sharing options...
Terminator Posted July 10, 2010 Share Posted July 10, 2010 Great news Jay, so glad you finally found the culprit. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 10, 2010 Share Posted July 10, 2010 im suprised the igniter hadnt melted the carpet. Quote Link to comment Share on other sites More sharing options...
Ian C Posted July 10, 2010 Share Posted July 10, 2010 I might have missed something here but why was the igniter in the footwell?! Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2010 Author Share Posted July 11, 2010 I might have missed something here but why was the igniter in the footwell?! , that'd be me being obsessive & wanting the engine bay as clutter free as possible Quote Link to comment Share on other sites More sharing options...
hodge Posted July 11, 2010 Share Posted July 11, 2010 Ive hidden mine under the plenum. Plenty of air to keep it cool and its out of site too:d Quote Link to comment Share on other sites More sharing options...
johnny g Posted July 11, 2010 Share Posted July 11, 2010 Jay, buy a new igniter, they're only about £145 - and you know it's sorted forever then. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 11, 2010 Share Posted July 11, 2010 Jay, buy a new igniter, they're only about £145 - and you know it's sorted forever then. I thought they would be a lot more that that Johnny. Thats good to know. Quote Link to comment Share on other sites More sharing options...
johnny g Posted July 11, 2010 Share Posted July 11, 2010 I thought they would be a lot more that that Johnny. Thats good to know. I had to buy one for the MR2 when we were researching all that, I got it from Edinburgh Toyota if that helps. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 11, 2010 Share Posted July 11, 2010 Cheers Johnny i keep that in mind mate. Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2010 Author Share Posted July 11, 2010 I've got a couple of options, if they fall through I might just do that, mine is working, it just seemed a little more hesitent on light throttle than Johns Quote Link to comment Share on other sites More sharing options...
johnny g Posted July 11, 2010 Share Posted July 11, 2010 Maybe it's just a bit past it's best? Quote Link to comment Share on other sites More sharing options...
jevansio Posted July 11, 2010 Author Share Posted July 11, 2010 Prolly overheated Quote Link to comment Share on other sites More sharing options...
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