Weng Posted May 8, 2020 Report Share Posted May 8, 2020 Log 2020-05-7 2;19;06 pm.llg06.05.20.pclrHi guy, my car have a misfire and jerking around 4-4.5k rpm, before and after this range is no problem. I have change all 4 cop and spark plug, Advanced 4 degree and retard 4 degree, Adding more fuel at that range, still can't solve the problem, it still jerking and misfire at 4-4.5k rpm this range Car spec : 1.6L bolt on turbo Links g4+ atom2 Boosting 0.5 bar Using fuel Ron 95 octane Mapping https://drive.google.com/file/d/1RBTmVRRrjbIWoxL4r4WjHVRgO8786pe4/view Log https://drive.google.com/file/d/1RHqNHhx-KPs1YfbHohPeOalp5GEMtKCg/view 06.05.20.pclr Log 2020-05-7 2;19;06 pm.llg Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted May 8, 2020 Report Share Posted May 8, 2020 whats the spark plug gap set to? Quote Link to comment Share on other sites More sharing options...
Weng Posted May 8, 2020 Author Report Share Posted May 8, 2020 15 minutes ago, Brad Burnett said: whats the spark plug gap set to? Denso iridium it24 Gap 0.6mm Quote Link to comment Share on other sites More sharing options...
remski2 Posted May 8, 2020 Report Share Posted May 8, 2020 Not sure if you saw that lean spot starting at 4K and ending around 4.5K.. Maybe it wants more fuel at that rpm.. or maybe an injector/fueling issue ? I see the pw doesnt change. On a 2nd note.. your dwell time seems to be jumping a lot between 1.2 and 2.9ms.. (~3k rpm range) Quote Link to comment Share on other sites More sharing options...
Weng Posted May 8, 2020 Author Report Share Posted May 8, 2020 27 minutes ago, remski2 said: Not sure if you saw that lean spot starting at 4K and ending around 4.5K.. Maybe it wants more fuel at that rpm.. or maybe an injector/fueling issue ? I see the pw doesnt change. On a 2nd note.. your dwell time seems to be jumping a lot between 1.2 and 2.9ms.. (~3k rpm range) The afr lean at 4-4.5k rpm is cause misfire, I have add fuel up to 10ve+, it still misfire at that range of rpm remski2 1 Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted May 8, 2020 Report Share Posted May 8, 2020 try dropping plug gap to say about .45mm and see what you get. Quote Link to comment Share on other sites More sharing options...
remski2 Posted May 8, 2020 Report Share Posted May 8, 2020 3 hours ago, Weng said: Denso iridium it24 Gap 0.6mm Just throwing it out there.. I did have a set of fake NGK plugs off Amazon... I didnt have any missfires but it seemed to knock a bit too much under low ignition.. Also have you tried increasing dwell at that rpm ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 8, 2020 Report Share Posted May 8, 2020 From the fuzziness on your RPM trace, the dwell going crazy in the earlier part of your log and the RPM ROC spiking in a regular pattern I suspect you have a trigger issue. Can you get an oscilloscope capture of the crank and cam signal. Just at idle will probably be fine. Quote Link to comment Share on other sites More sharing options...
Weng Posted May 9, 2020 Author Report Share Posted May 9, 2020 7 hours ago, Adamw said: From the fuzziness on your RPM trace, the dwell going crazy in the earlier part of your log and the RPM ROC spiking in a regular pattern I suspect you have a trigger issue. Can you get an oscilloscope capture of the crank and cam signal. Just at idle will probably be fine. I need find a oscilloscope 1st since my country not every workshop have it, BTW thanks for the advice, will post here after get the crank signal pettern Quote Link to comment Share on other sites More sharing options...
Weng Posted May 9, 2020 Author Report Share Posted May 9, 2020 11 hours ago, Adamw said: From the fuzziness on your RPM trace, the dwell going crazy in the earlier part of your log and the RPM ROC spiking in a regular pattern I suspect you have a trigger issue. Can you get an oscilloscope capture of the crank and cam signal. Just at idle will probably be fine. Hi Adam, this log is I half throttle Boosting around 0.3bar(4psi), It no misfire or jerking at 4-4.5k rpm that range 09.05.20 v1.pclr Log 2020-05-9 4;40;58 pm.llg Quote Link to comment Share on other sites More sharing options...
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