Wildt267 Posted June 20, 2022 Report Share Posted June 20, 2022 I'm trying to troubleshoot at intermittent misfire at low load. I read a post on here indicating the factory trigger wheel lacks the resolution to be able to accurately track misfires. On my factory ecu i was able to monitor a parameter called "roughness" which i thought was tracking misfires. How did the factory ecu do that and is there something similar in the g4x that i haven't found yet? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 20, 2022 Report Share Posted June 20, 2022 37 minutes ago, Wildt267 said: On my factory ecu i was able to monitor a parameter called "roughness" which i thought was tracking misfires. How did the factory ecu do that and is there something similar in the g4x that i haven't found yet? Have you seen the Engine Speed ROC runtime value? It might work as some approximation of engine roughness. Wildt267 1 Quote Link to comment Share on other sites More sharing options...
kaptainballistik Posted June 20, 2022 Report Share Posted June 20, 2022 If you have the COP coils, Can you stick them into another car to try them? For some reason the Link can "drive" coils that on a STD ecu wont even work! Ask me how I know this... Wildt267 1 Quote Link to comment Share on other sites More sharing options...
Wildt267 Posted June 20, 2022 Author Report Share Posted June 20, 2022 2 minutes ago, kaptainballistik said: If you have the COP coils, Can you stick them into another car to try them? For some reason the Link can "drive" coils that on a STD ecu wont even work! Ask me how I know this... unfortunately not but that's a good idea. I just replaced the coils with a new Oem set. 21 hours ago, Vaughan said: Have you seen the Engine Speed ROC runtime value? It might work as some approximation of engine roughness. That was an excellent idea, thank you. Sure enough i'm seeing some negative values where there shouldn't be. Didn't catch that in the logs as i was so focused on everything else. Vaughan 1 Quote Link to comment Share on other sites More sharing options...
kaptainballistik Posted June 23, 2022 Report Share Posted June 23, 2022 Are you getting Missfires on over 15PSi of boost? Quote Link to comment Share on other sites More sharing options...
remski2 Posted June 23, 2022 Report Share Posted June 23, 2022 Your coils.. they are 3ms or 5ms. ? And is that reflected in the dwell table. Quote Link to comment Share on other sites More sharing options...
Wildt267 Posted June 23, 2022 Author Report Share Posted June 23, 2022 16 hours ago, kaptainballistik said: Are you getting Missfires on over 15PSi of boost? it's more of a low load thing. Doesn't really seem to be getting them in boost 6 hours ago, remski2 said: Your coils.. they are 3ms or 5ms. ? And is that reflected in the dwell table. My dwell table goes from about 5ms dropping down to 2.8ms at high rpm. I think i tried to increase the dwell a bit awhile back but didnt see and change so i backed them back down. Quote Link to comment Share on other sites More sharing options...
remski2 Posted June 24, 2022 Report Share Posted June 24, 2022 20 hours ago, Wildt267 said: it's more of a low load thing. Doesn't really seem to be getting them in boost My dwell table goes from about 5ms dropping down to 2.8ms at high rpm. I think i tried to increase the dwell a bit awhile back but didnt see and change so i backed them back down. That still doesnt tell us which coils you have. Your table setting are for 5ms coils.. Black coils are 3ms Grey coils are 5ms Quote Link to comment Share on other sites More sharing options...
Wildt267 Posted June 25, 2022 Author Report Share Posted June 25, 2022 They are the grey coils Quote Link to comment Share on other sites More sharing options...
kaptainballistik Posted June 29, 2022 Report Share Posted June 29, 2022 Next.... Plugs! I'm presuming Iridium's? If you go for a good run, Will the missfire stay away for awhile?. and.. If you go for a drive and then pull out a plug with minimal idle time, hw much soot is there on the plug? Quote Link to comment Share on other sites More sharing options...
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