Rough idle with forced induction

jwick

I'll do some idle logging this weekend.

I might pull post cat sensors if I can get my tuner to update my map.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Radride

Its nice to know that the rear O2 sensors should be deleted. I'm getting the occasional check engine light with reference to the rear O2 sensors so before I shell out another 200 bucks to replace it, I will stay tuned to this thread. Great work Mitch.

R.K.

Mitco39

Thanks Rad. Pretty much its looking like those Rear O2s are just a check for the Cat functions. No cats no need to have the ECU check them. I think I am going to get some plugs and remove mine completely here next time I am under the car just to clean it up so they do not snag on anything.

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

09 Nismo#400

Just an update for mine I have removed the Rear O2's and it has been idling just fine now my wideband reads 14.0 - 14.9. Now I just have to remove that code that came up from that and it is looking good. Thanks for finding this fix Mitco39.

Mitco39

Totally forgot to check this out for you jwick, ill do it tonight if I can remember. I am dropping my car off to get detailed this week so ill be without it most of the week.

I can tell you guys that the bad start has been fixed and it was never related to the tune, it was just a coincidence that it started to happen right around the same time. One of the wires from the fuel pump relay was coming loose from where it connects to the relay block. Got that all fixed and she starts right up just fine every time. I started 3 times back to back to back and it will good to go.

Also even driving like a toolbag at times my mileage has gone way way up after I dialed my tune in. It no longer idles or cruises rich. The hunting has almost all but stopped (still a slight hunt which I would attribute to the rerouting of the crankcase emissions system and removing it from the intake. Unfortunately there is no way to tweak the settings responsible for this. It could be the vvel doing its best to control the idle. Its minimal though compared to what it once was.

__________________
2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

jwick

awesome mitch. I can't wait to discuss this with tuner.

I've been thinking the crank case being directly vented instead of rerouted into the system might be causing issues too. wonder if there is any way we could find a way to rig them back in. I know the GTM kit routes them back in. I believe its pre-turbo. that would be impossible for us since the filter is directly on the turbo.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Mitco39

My car has been at a detailers all week and my cable is in the car so I havent had uprev infront of me for a bit.

But if you were going to route that vent back it would have to be under a vac only condition so you dont pressurize the crankcase more than necessary.

You could do this via a PCV valve so that when your under boost it keeps the boost out of the crankcase, but under vac it sucks in the crankcase emissions. I had it all figured out in my head last year and there is a thread that I believe I started on it. I will dig through it and see what I can come up with when I get time.

Although I personally think if we had access to the IAC tables we could tune for the idle. I also believe the VVEL does not help us. Does anyone have any experience with say sashas kit on the 350Z where the crankcase ventilation is also routed in a similar fashion?


Mitch

__________________
2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

elperuano

Sorry if I'm asking a repeated question but is this problem only related to BP kits? Minor problem which I hope tuner could fix soon.

Mitco39

Jwick,

Open up your rom editor then once its connected to the car click the logging button as shown.




Then from there you can select all the parameters you want to log. Hit record then when you are done you can stop the recording and save the log. THe log is saved in a CSV form that can be open with microsoft excel.

__________________
2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

jwick

Logging is not an issue. Although mine looks way different than that. It must be that I have the standard package and not tuner. I'll pull the parameters I can but I'm pretty sure 'Target AFR' is not an option on the standard cable.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

nomodsjk

I'm having the same issue! This didn't start until I replaced the passenger side throttle body. I was then instructed by R/T tuning that I needed to do a throttle body relearn but I was unable to because Nissan couldn't access my ecu because of the custom tune. Well since I live 3 hours away from R/T tuning they emailed me a manual relearn process which I had Nissan do because I received the email the same day the car was in for service. When I got the car back everything seemed fine until the first attempt to turn on the AC. As soon as I flipped the switch the car started this issue and has been like that ever since. I even took it all the way back to Lansdale PA (r/t) and of course the car wasn't doing it when I was there so they were unable to fix it but the car eventually did throw a code which was for a low idle. So it's my belief that when the car went through the manual relearn process the idle was set too low but r/t disagreed. All I'm sure of is everything was fine before the relearn and now it seems like it's going to stall out at low rpm's and runs really rich at times

jwick

What kit are you running?

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

nomodsjk

I'm all stillen. Every performance part stillen makes for a 7at 370z is on my car. Also Vince at r/t told me to clean my filters and mafs so I did and that did nothing.

jwick

Wonder if the issues are similar.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

nomodsjk

The only thing I'm sure of is I spent too much time and money to have my car sound like its broken