Cnote0ne Posted July 18, 2021 Author Report Share Posted July 18, 2021 It's strange that those figures before were bad, but the car ran fine with a correct AFR. I tuned the fuel table and was ready to go on the dyno for more tuning. It's running now but the AFR is bouncing all over the place. I'm getting huge spikes during normal driving. I still can't seem to attach a log. Is there a calibration step for the wideband? My old UTEC setup had a calibration step for new wideband sensors. Quote Link to comment Share on other sites More sharing options...
dx4picco Posted July 18, 2021 Report Share Posted July 18, 2021 You plug your wideband controler to a permanent 12v source and not a switched one Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 18, 2021 Author Report Share Posted July 18, 2021 Here is a log I ran today. The AFR is all over the place. I've never had it bounce around like that. I use the same Bosch wideband I got with the G4+. https://1drv.ms/u/s!AjI8sO2lko8akQ-GYdIf8gdSLgEG?e=wQZ816 Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 19, 2021 Report Share Posted July 19, 2021 The leans spikes are puffs of oxygen going through the exhaust. It appears to most likely be a misfire as it looks worse as load increase, but could also potentially be an air leak, exhaust leak or similar. Not related but just FYI before you tune too much: it looks like your VVT offsets might be wrong as your inlet cams appear to top out at about 30deg when they are trying to reach 40deg. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 19, 2021 Author Report Share Posted July 19, 2021 1 hour ago, Adamw said: 1 hour ago, Adamw said: Not related but just FYI before you tune too much: it looks like your VVT offsets might be wrong as your inlet cams appear to top out at about 30deg when they are trying to reach 40deg. How do I correct that? I upgraded the cams and I want to get the most out of them. Thanks. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 19, 2021 Report Share Posted July 19, 2021 With the engine at fast idle, above the RPM and ECT lockouts, set cam angle test to "LH Inlet", set test pulse count to 6. Go to the runtimes screen, VVT tab and look at the 6 reported cam angles, note down the smallest one. This is the offset value that you enter into DI1 settings. Do the same test but for RH inlet, this value you enter in Trig 2 VVT settings. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 19, 2021 Author Report Share Posted July 19, 2021 15 hours ago, Adamw said: The leans spikes are puffs of oxygen going through the exhaust. It appears to most likely be a misfire as it looks worse as load increase, but could also potentially be an air leak, exhaust leak or similar. I found a small crack in the wideband bung and thought that was the source of the leak. After welding it, I still get the erratic AFR. No cracks in turbo manifolds. I don't see any other area in the exhaust for a leak. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 19, 2021 Author Report Share Posted July 19, 2021 I moved the wideband sensor to the passenger side pipe and I still get the same bouncing effect. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 23, 2021 Author Report Share Posted July 23, 2021 Problem solved. The wideband sensor was bad. Thanks guys. Quote Link to comment Share on other sites More sharing options...
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