Cnote0ne Posted June 18, 2021 Report Share Posted June 18, 2021 The car is a 350z with a G4+ PnP. It started with a bad O2 sensor which I replaced now twice with new sensors and the car still idle rough and has no power. AN-10 O2 sig LF show 0.00 while the AN-11 O2 Sig RF show .85. https://1drv.ms/u/s!AjI8sO2lko8akH6kI96B56xIdXJM?e=lHk5VA Log file https://1drv.ms/u/s!AjI8sO2lko8akH921J_VdxL44Hy9?e=xgTCJj Base map Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 18, 2021 Report Share Posted June 18, 2021 Your model possibly has the factory wideband which isnt compatable. Text from the manual below. But that is unlikely your problem, the O2 sensors are typically not used in most tunes. Has it been tuned? Did the problem only just occur or has it always been like that? Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted June 18, 2021 Author Report Share Posted June 18, 2021 It just started after the O2 sensor went bad. The car was running great until the O2 sensor went. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 18, 2021 Report Share Posted June 18, 2021 does it only run bad once it's up to temperature? Your tune shows that it does use the NB sensors but only once it's up to 70deg c coolant temp and only between 1200 and 3500rpm Actually nevermind, I looked at that again and it's using a wideband CLL mode, do you have CAN based wideband Lambda sensors? Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted June 18, 2021 Author Report Share Posted June 18, 2021 The voltage will ramp, match the other for a few seconds and settle back to 0. It does seem to run ok for a couple of minutes. 7 minutes ago, Vaughan said: does it only run bad once it's up to temperature? Your tune shows that it does use the NB sensors but only once it's up to 70deg c coolant temp and only between 1200 and 3500rpm Yep, it does idle smoother at first start. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 18, 2021 Report Share Posted June 18, 2021 11 minutes ago, Vaughan said: Actually nevermind, I looked at that again and it's using a wideband CLL mode, do you have CAN based wideband Lambda sensors? do you have a wideband setup? Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted June 18, 2021 Author Report Share Posted June 18, 2021 2 minutes ago, Vaughan said: do you have a wideband setup? Yes, they are wideband. When I add fuel at idle the voltage on the side showing 0 goes to .85 but my AFR is in the 10s. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 18, 2021 Report Share Posted June 18, 2021 From looking at the tune the NB sensors don't affect the fueling of the vehicle but the wideband does. You have one wideband hooked up but your CLL is setup for dual widebands and so any CLL correction made will only affect one bank of the engine, that being said it isn't making any big changes in your supplied log. Have you considered that something else has gone wrong with the engine which is causing the NB reading to look wrong and making it run rough, say if it missing on one cylinder that will both make it run rough and will change the O2 reading on the sensor on that bank of the engine. Quote Link to comment Share on other sites More sharing options...
Adamw Posted June 18, 2021 Report Share Posted June 18, 2021 Yes as per Vaughans suggestion you only have one CAN bus wideband set up, so you cant use dual bank wideband control. If your front O2 sensors are narrorbands you could swap to narrowband CLL mode otherwise you will have to fit an extra wideband controller that matches the existing one. At the moment your tune is not using the sensors on AN V10/11 at all. I also agree that your problem doesnt appear to be related to the CLL or O2 sensor. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted June 18, 2021 Author Report Share Posted June 18, 2021 6 minutes ago, Vaughan said: From looking at the tune the NB sensors don't affect the fueling of the vehicle but the wideband does. You have one wideband hooked up but your CLL is setup for dual widebands and so any CLL correction made will only affect one bank of the engine, that being said it isn't making any big changes in your supplied log. Have you considered that something else has gone wrong with the engine which is causing the NB reading to look wrong and making it run rough, say if it missing on one cylinder that will both make it run rough and will change the O2 reading on the sensor on that bank of the engine. I guess it's possible, I may have a bad coil pack. In the process of troubleshooting the bad O2 sensor, I went through the coils, spark plugs, wires and connectors. Once I changed the O2 sensor with an old one everything was fine until that sensor went bad. I will check the coils and spark plugs again. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 18, 2021 Report Share Posted June 18, 2021 do you have any old logs from before it started running rough, one other thing I noticed in your log is that it is generally running quite a lot richer than the target Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted June 18, 2021 Author Report Share Posted June 18, 2021 12 minutes ago, Vaughan said: do you have any old logs from before it started running rough, one other thing I noticed in your log is that it is generally running quite a lot richer than the target Here is an old log. Fuelchange log.llg Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 18, 2021 Report Share Posted June 18, 2021 That log is just failed starts, shows no information relevant to the engine running generally rich Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted June 18, 2021 Author Report Share Posted June 18, 2021 15 minutes ago, Vaughan said: That log is just failed starts, shows no information relevant to the engine running generally rich Log 2020-06-19 6;24;05 pm.llg how about this one? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted June 20, 2021 Report Share Posted June 20, 2021 your wideband doesn't appear to be working properly in that log Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 10, 2021 Author Report Share Posted July 10, 2021 I purchased a new Bosch wideband sensor but now the car won't stay running. It idles for a few seconds and die. Please see the log. Thx. \https://1drv.ms/u/s!AjI8sO2lko8akQkVE9KIHH3aO19e?e=Hu8XTS Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 10, 2021 Report Share Posted July 10, 2021 I would be checking the basics such as fuel pressure and all injectors are working. It appears you can keep it running by pumping the throttle which would suggest there is a lack of fuel. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 11, 2021 Author Report Share Posted July 11, 2021 2 hours ago, Adamw said: I would be checking the basics such as fuel pressure and all injectors are working. It appears you can keep it running by pumping the throttle which would suggest there is a lack of fuel. Thanks. Unfortunately, I don't have a fuel pressure gauge but the injectors are new. Maybe the pump? It's over 14yrs old. I do hear it prime when I turn the key. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 16, 2021 Author Report Share Posted July 16, 2021 On 7/10/2021 at 5:26 PM, Adamw said: I would be checking the basics such as fuel pressure and all injectors are working. It appears you can keep it running by pumping the throttle which would suggest there is a lack of fuel. I added a fuel pressure gauge and it shows 43 psi. New o2 sensor , injectors, wideband sensor and car still won't stay running long enough to read AFR. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 17, 2021 Report Share Posted July 17, 2021 Can you give us more of the story, has this previously been tuned and running ok and just stopped running? Or is it a new install etc? Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 17, 2021 Author Report Share Posted July 17, 2021 4 hours ago, Adamw said: Can you give us more of the story, has this previously been tuned and running ok and just stopped running? Or is it a new install etc? It's not a new install. The car was running fine until the upstream O2 sensor on the passenger side went bad. I changed it with an old one I had laying around and car was back to normal for a few days and the sensor went bad again. I decided to replace both upstream sensors and the car would still idle rough, but no codes. I replaced injectors with new 550cc ones since I had to upgrade to a bigger size anyway, checked spark plugs, coils, connectors. Now the car won't stay idle. It idles fine for a few seconds and die. I can rev it up a few times and it dies even when giving it gas. O2 sensor starts at .85 volt and drop to 0.0 just before it dies. Fuel pressure show 52 psi at idle. Please see the attached log. Thanks. https://1drv.ms/u/s!AjI8sO2lko8akQqOhVmSC6KNRHlC?e=o2lt1o Quote Link to comment Share on other sites More sharing options...
dx4picco Posted July 17, 2021 Report Share Posted July 17, 2021 Hotwire the lambda to see what happens at startup Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 17, 2021 Author Report Share Posted July 17, 2021 I managed to get it to idle by adding a crazy amount of fuel than previously tuned. My fuel table went from the 27, 28 in the idle cells to 65. The wideband is bouncing between 14.0 and 15ish. Could this be due to a faulty wideband? I'm having some issues with attaching files. Quote Link to comment Share on other sites More sharing options...
Cnote0ne Posted July 17, 2021 Author Report Share Posted July 17, 2021 1 hour ago, dx4picco said: Hotwire the lambda to see what happens at startup How do I do that? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 17, 2021 Report Share Posted July 17, 2021 8 hours ago, Cnote0ne said: I replaced injectors with new 550cc ones since I had to upgrade to a bigger size anyway, If you have changed injectors then it will need to be retuned. A VE around 50-65 at idle is normal, your old fuel table with ~28% at idle is not normal. Injector data was probably wrong before on the original injectors so it will need to be retuned. Its hard to know what caused it to stop running originally though, but likely some injectors were blocked or not working. Quote Link to comment Share on other sites More sharing options...
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