Rough idle with forced induction

Mitco39 · 07-15-2014, 10:20 AM

To be fair I think its quite easy to overlook the cold fueling table as well it says cold on the label. I initially did and then just decided to give it a try anyways knowing that sometimes the labels dont always mean what you think they mean. Heck cold could be just low enough of a coolant temp that at idle the car cools down just enough to hit it where its colder (without knowing the rational behind the code its just a guessing game).

All I can say is mine has not leaned out once since. I still have to find time to play with the hot starts (I tune most evenings during the week so I dont have much time to play with my own toys).

Jwick, send me a uprev log of both your sort term, long term, target afr, and rpm if you would like me to take a look at it for you.

Ill get a video of mine idling nice once I take it out next time.

GaleForce · 07-15-2014, 10:26 AM

Good job Mitch.

Now I need to find time to log my car.

Mitco39 · 07-15-2014, 10:33 AM

Jason,

If you get time send me the log if you would like. Its not telling me anything about the tune so I wouldn't be stepping on R/Ts toes or anything like that. I would just be more or less curious to see if your car is doing the same as mine.

GaleForce · 07-15-2014, 11:07 AM

Quote:

Originally Posted by Mitco39

Jason,

If you get time send me the log if you would like. Its not telling me anything about the tune so I wouldn't be stepping on R/Ts toes or anything like that. I would just be more or less curious to see if your car is doing the same as mine.

Absolutely Mitch. I wouldn't hesitate giving you additional data to help with your tests/theories, anything if it means helping this community.

jwick · 07-15-2014, 11:18 AM

Quote:

Originally Posted by Mitco39

To be fair I think its quite easy to overlook the cold fueling table as well it says cold on the label. I initially did and then just decided to give it a try anyways knowing that sometimes the labels dont always mean what you think they mean. Heck cold could be just low enough of a coolant temp that at idle the car cools down just enough to hit it where its colder (without knowing the rational behind the code its just a guessing game).

All I can say is mine has not leaned out once since. I still have to find time to play with the hot starts (I tune most evenings during the week so I dont have much time to play with my own toys).

Jwick, send me a uprev log of both your sort term, long term, target afr, and rpm if you would like me to take a look at it for you.

Ill get a video of mine idling nice once I take it out next time.

I'll have to do some logs in order to get you this. Which UpRev parameters are you actually looking at? My tuning knowledge is basic so I want to make sure I give you exactly what you are looking for.

MyKindaGuise · 07-15-2014, 11:34 AM

Quote:

Originally Posted by jwick

I'm definitely clueless. just hoping somebody finds a fix. mine is starting to idle worse. I think it might be that O2 sensor going out. replacement should be here Wednesday

I had that happen and my idle went to ****.

Also fwiw I have my rear O2s deleted since I went to boost. Im on ecutek so I cant modify maps on the fly like you guys can on uprev but I haven't seen any negative side effects to it yet?

Mitco39 · 07-15-2014, 11:40 AM

To just grab a quick log all you have to do is this (this is by memory so hopefully its a 100% correct, I dont have the cable with me currently to check it)

-Open Osiris Rom Editor
-Check for updates
-It will connect to the car and say ECU Ready after the updates are complete
-click logging and tracing
-On the right hand side of that window you will see all parameters you can select, if you happen to select to many it just wont log and you will be left scratching your head lol.
-I would like you to log the following;
-Short Term Fuel Trim Bank 1
-Short Term Fuel Trim Bank 2
-Long Term Fuel Trim Bank 1
-Long Term Fuel Trim Bank 2
-MAF flow (g/sec)
-Target AFR

Hit the red circle to record and then stop recording and save the log under file.

It will be the same ones that show up in those videos I posted last week.

Mitco39 · 07-15-2014, 11:41 AM

Quote:

Originally Posted by MyKindaGuise

I had that happen and my idle went to ****.

Also fwiw I have my rear O2s deleted since I went to boost. Im on ecutek so I cant modify maps on the fly like you guys can on uprev but I haven't seen any negative side effects to it yet?

In my opinion its starting to look like these rear O2s should be deleted and removed once the cats are removed.

jwick · 07-15-2014, 11:45 AM

Quote:

Originally Posted by Mitco39

To just grab a quick log all you have to do is this (this is by memory so hopefully its a 100% correct, I dont have the cable with me currently to check it)

-Open Osiris Rom Editor
-Check for updates
-It will connect to the car and say ECU Ready after the updates are complete
-click logging and tracing
-On the right hand side of that window you will see all parameters you can select, if you happen to select to many it just wont log and you will be left scratching your head lol.
-I would like you to log the following;
-Short Term Fuel Trim Bank 1
-Short Term Fuel Trim Bank 2
-Long Term Fuel Trim Bank 1
-Long Term Fuel Trim Bank 2
-MAF flow (g/sec)
-Target AFR

Hit the red circle to record and then stop recording and save the log under file.

It will be the same ones that show up in those videos I posted last week.

Nice detailed notes

I'm not that basic, I know how to log just wanted to make sure I knew exactly what parameters you wanted.

Mitco39 · 07-15-2014, 01:13 PM

Quote:

Originally Posted by jwick

Nice detailed notes

I'm not that basic, I know how to log just wanted to make sure I knew exactly what parameters you wanted.

I just typed it out for anyone else following along. This makes it pretty straightforward for everyone.

Radride · 07-15-2014, 01:33 PM

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 · 07-15-2014, 02:17 PM

Quote:

Originally Posted by 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.

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.

09 Nismo#400 · 07-16-2014, 09:41 PM

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.

jwick · 07-18-2014, 03:12 PM

Quote:

Originally Posted by Mitco39

To just grab a quick log all you have to do is this (this is by memory so hopefully its a 100% correct, I dont have the cable with me currently to check it)

-Open Osiris Rom Editor
-Check for updates
-It will connect to the car and say ECU Ready after the updates are complete
-click logging and tracing
-On the right hand side of that window you will see all parameters you can select, if you happen to select to many it just wont log and you will be left scratching your head lol.
-I would like you to log the following;
-Short Term Fuel Trim Bank 1
-Short Term Fuel Trim Bank 2
-Long Term Fuel Trim Bank 1
-Long Term Fuel Trim Bank 2
-MAF flow (g/sec)
-Target AFR

Hit the red circle to record and then stop recording and save the log under file.

It will be the same ones that show up in those videos I posted last week.

I must be retarded but none of the fuel trims you are referring to bar options on my cipher. would it matter that I only have a standard cable?

Mitco39 · 07-18-2014, 04:16 PM

Quote:

Originally Posted by 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.

Glad it has worked out for you, let me know if you need a hand getting the codes gone. It should be as simple as just turning them off, I can include screenshots if you wish.

Quote:

Originally Posted by jwick

I must be retarded but none of the fuel trims you are referring to bar options on my cipher. would it matter that I only have a standard cable?

They might call it something different with cipher, it should still be able to see these PIDS however. Ill check this weekend for you.

I will probably bring the car to the track tonight and do a few more runs in her. I will also play with the hot starts tonight and see if I can find a happy medium between hot starts and lean out conditions during idling. This is if it does not storm here tonight, there is a 40% chance

07-15-2014, 10:20 AM	#31 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	To be fair I think its quite easy to overlook the cold fueling table as well it says cold on the label. I initially did and then just decided to give it a try anyways knowing that sometimes the labels dont always mean what you think they mean. Heck cold could be just low enough of a coolant temp that at idle the car cools down just enough to hit it where its colder (without knowing the rational behind the code its just a guessing game). All I can say is mine has not leaned out once since. I still have to find time to play with the hot starts (I tune most evenings during the week so I dont have much time to play with my own toys). Jwick, send me a uprev log of both your sort term, long term, target afr, and rpm if you would like me to take a look at it for you. Ill get a video of mine idling nice once I take it out next time. wheee!, jwick and GaleForce like this. __________________ 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

07-15-2014, 10:26 AM	#32 (permalink)
GaleForce A True Z Fanatic Join Date: Aug 2011 Location: Ontario, Canada Posts: 21,749 Drives: Varis Arising II Rep Power: 51865	Good job Mitch. Now I need to find time to log my car. __________________ >>>GaleForce's Build<<< >>>FaceBook @3GsCustoms<<<>>>Instagram @GaleForce370z<<< Varis Kamikaze-Z

07-15-2014, 10:33 AM	#33 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	Jason, If you get time send me the log if you would like. Its not telling me anything about the tune so I wouldn't be stepping on R/Ts toes or anything like that. I would just be more or less curious to see if your car is doing the same as mine. __________________ 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

07-15-2014, 11:40 AM	#37 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	To just grab a quick log all you have to do is this (this is by memory so hopefully its a 100% correct, I dont have the cable with me currently to check it) -Open Osiris Rom Editor -Check for updates -It will connect to the car and say ECU Ready after the updates are complete -click logging and tracing -On the right hand side of that window you will see all parameters you can select, if you happen to select to many it just wont log and you will be left scratching your head lol. -I would like you to log the following; -Short Term Fuel Trim Bank 1 -Short Term Fuel Trim Bank 2 -Long Term Fuel Trim Bank 1 -Long Term Fuel Trim Bank 2 -MAF flow (g/sec) -Target AFR Hit the red circle to record and then stop recording and save the log under file. It will be the same ones that show up in those videos I posted last week. __________________ 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

07-16-2014, 09:41 PM	#43 (permalink)
09 Nismo#400 Base Member Join Date: Mar 2012 Location: North Dakota Posts: 25 Drives: 09 370z Nismo T Rep Power: 13	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. GaleForce and Mitco39 like this.

07-15-2014, 01:33 PM	#41 (permalink)
Radride Base Member Join Date: Feb 2014 Location: Canada Posts: 162 Drives: Ram Rep Power: 11	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
WTF? rough idle after refueling (new car!)	InnerDragon10	Nissan 370Z General Discussions	16	05-17-2014 04:41 AM
Running Rich-rough idle with supercharger	Tombonombona	Tuning	11	04-22-2014 07:25 PM
Forced induction	stiso	Northern California Region	8	11-28-2011 01:03 PM
Rough Idle on occasion	chuckd05	Engine & Drivetrain	3	08-12-2011 07:10 PM
Forced induction	Seth G	Forced Induction	13	04-09-2010 01:36 AM