edviss Posted May 18, 2021 Share Posted May 18, 2021 Hi All, 2jz non vvti NA-T I thought I will open a thread in case someone had a similar issue.. as after months of looking still no luck. Below I have attached a graph from EcuMaster log. 2nd gear looks pretty clean, but once I change to 3rd it start to misfire straight away, 2nd and 3rd gear both in same boost 175kpa mark. I dont get any misfire below 10psi of boost. Parts I have changed: Injectors - 715cc bosch ev14 Coilpacks - yaris smart coils Fuel Pump - walbro 450lph + Relay mod Spark Plugs - bkr7eix and bkr8eix Fuel Dampener Removed BC valve springs and bsc stem seals On high boost ECU and engine is not loosing any voltage or fuel pressure. Compression on all 6 cylinders is good. Things like changing dwell time, gapping spark plugs, changing map and etc have been tried. It kind a feels like it is more mechanical than electrical issue, engine get higher load in 3rd gear and starts to misfire? but what could cause that Any suggestions welcome! Thanks, Ed Link to comment Share on other sites More sharing options...
Annabella Posted May 18, 2021 Share Posted May 18, 2021 (edited) ECU problem? Just saw it's a W58? Edited May 18, 2021 by Annabella (see edit history) Link to comment Share on other sites More sharing options...
Noz Posted May 19, 2021 Share Posted May 19, 2021 Uncle Mike. Where are you Link to comment Share on other sites More sharing options...
edviss Posted May 19, 2021 Author Share Posted May 19, 2021 8 hours ago, Annabella said: ECU problem? Just saw it's a W58? Yep its w58. ecu is brand new as well Link to comment Share on other sites More sharing options...
edviss Posted May 19, 2021 Author Share Posted May 19, 2021 (edited) 57 minutes ago, Noz said: Uncle Mike. Where are you Mike had this car for couple of days at SRD. Fixed loads of little issues but we couldnt find this misfire. We have been trying to figure this out since day one now Big thanks to Mike! Edited May 19, 2021 by edviss (see edit history) Link to comment Share on other sites More sharing options...
Style Posted May 19, 2021 Share Posted May 19, 2021 What are you using for cam/crank signal? Same thing happened to me but I never found out the root cause...blew the car up and melted 5 pistons before getting to the bottom of it. I'd changed pretty much everything you've changed as well and it only pushed the misfire higher up the rev range. My misfire started in second gear but I'm V161, so it's probably in the same region as 3rd in a W58. I was still on a distributor at the time and my only remaining suspicion was that the dizzy was on it's way out and not communicating with the ECU properly. Maybe as a result, timing wasn't where it was meant to be and ultimately lead to the misfire. Link to comment Share on other sites More sharing options...
Mike2JZ Posted May 19, 2021 Share Posted May 19, 2021 Are you on ECUMaster as well style? Link to comment Share on other sites More sharing options...
Noz Posted May 19, 2021 Share Posted May 19, 2021 Going coils wouldn't be a bad shout anyway. The dizzy never saw me good. Link to comment Share on other sites More sharing options...
edviss Posted May 19, 2021 Author Share Posted May 19, 2021 Still running oem dizzy for cam and crank signal with Denso coilpacks 90919-02240 Link to comment Share on other sites More sharing options...
Noz Posted May 19, 2021 Share Posted May 19, 2021 32 minutes ago, edviss said: Still running oem dizzy for cam and crank signal with Denso coilpacks 90919-02240 Good shout. Missed that in your initial post. Sensors seem the next best choice. Link to comment Share on other sites More sharing options...
Style Posted May 19, 2021 Share Posted May 19, 2021 1 hour ago, Mike2JZ said: Are you on ECUMaster as well style? I am now but was on AEM v2 when it went bang. The AEM's were quite bad when it comes to crank/cam signal strength from what I've read on some pages. Link to comment Share on other sites More sharing options...
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