Total NEWB trying to get a better idle

[Cringer]

Hi guys just took the car for a nice 20 min cruise. got some gas start stop and a few 3/4 throttle romps.
channels added. Log file Attached. Thank you all so much for the support... reading as much as I can and watching goat rope like a lunitic...

Feedback on log greatly appreciated.

I updated your MAF, but I cannot do VVE until you supply the Dynamic Airflow and Torque Management Advance channels.

I also have serious doubts about how well any of this will work since the fuel system status is "CL - Fault" and Long Terms are at 24%.

Also, next time don't start logging until the engine is at full temp.

How is the idle? Better?

67_camaro-2019_vette_Gmpp_LS3495hp-Idle-issue - cringer2.hpt

[Xlexustech]

I updated your MAF, but I cannot do VVE until you supply the Dynamic Airflow and Torque Management Advance channels.

I also have serious doubts about how well any of this will work since the fuel system status is "CL - Fault" and Long Terms are at 24%.

Also, next time don't start logging until the engine is at full temp.

How is the idle? Better?

67_camaro-2019_vette_Gmpp_LS3495hp-Idle-issue - cringer2.hpt

Yes better drops a little low but not to a sahl.. it feels close tho... only when rpm is coming down.. it dips down to 500
Ill do some resaech on what this means.. " fuel system status is "CL - Fault" and Long Terms are at 24%."

I pulled the starter and ordered a heat shield.. tht will be here tomorrow then I will get another log with the new channels.

[Xlexustech]

Thanks ROB.. will add those channels. and understood no WOT.. and shes lean..
Maybe thats whay its not getting to closed loop?
I am goig to check all coneections and O2 wiring. I ordered a starter heat shiled it comes in tomorrow. Ill try to get another log using the file cringe sent tomorrow... just so I am working form 1 file.

[Cringer]

Yes better drops a little low but not to a sahl.. it feels close tho... only when rpm is coming down.. it dips down to 500
Ill do some resaech on what this means.. " fuel system status is "CL - Fault" and Long Terms are at 24%."

I pulled the starter and ordered a heat shield.. tht will be here tomorrow then I will get another log with the new channels.

Maybe Blind Squirrel, Alvin, or Ed knows the common things to check for CL Fault. I see both O2 voltages are present and oscillating, so I am not sure what else it could be. But fuel trims are the basis of tuning MAF and VVE...and if the ECM says there is a fault in the system we have to question the validity of the fuel trims in the first place. Normally the Check Engine light comes on with the fuel trims are pegged around +/-25%

CL Fault.jpg

[Xlexustech]

Maybe Blind Squirrel, Alvin, or Ed knows the common things to check for CL Fault. I see both O2 voltages are present and oscillating, so I am not sure what else it could be. But fuel trims are the basis of tuning MAF and VVE...and if the ECM says there is a fault in the system we have to question the validity of the fuel trims in the first place. Normally the Check Engine light comes on with the fuel trims are pegged around +/-25%

CL Fault.jpg

I just pulled the starter to get ahead of the heat shield install .. so I cant check for DTC.. Just added the 2 channels DAF and TMA to the config..

[gtstorey]

My e69 would show CL fault with a bad heater code on an oxygen sensor. But that is a strange ECM.

And this was both with the code as stock and no error reported.

[Xlexustech]

"Pretty dang lean from 1500 rpm and under, but rich above that. "

Thought Id mention this.. i get a lot of popping when iget off the throttle ..xtra fuel I believe which is supported by ROBs analysis .. ... I have a torque arm so couldn't fit an x pipe..

[LS ROB]

You can try to flash that tune in i sent you earlier in the thread. It will probably still show lean down low, but not as much since I did hit the VVE a little. Can't remember right off if I addressed the Idle issue directly or not, but giving it more fuel will help some.

[Cringer]

Thought Id mention this.. i get a lot of popping when iget off the throttle ..xtra fuel I believe which is supported by ROBs analysis .. ... I have a torque arm so couldn't fit an x pipe..

Popping is typically caused by either a lean condition or ignition timing that is retarded too much. Check the log for your coast down spark timing, most likely it will be negative which means your Airflow Final Min is too high.

[Xlexustech]

Rained all day... could not get the car out to get an new log. My goal is to get one tomorrow weather permitting.

[Xlexustech]

I updated your MAF, but I cannot do VVE until you supply the Dynamic Airflow and Torque Management Advance channels.

I also have serious doubts about how well any of this will work since the fuel system status is "CL - Fault" and Long Terms are at 24%.

Also, next time don't start logging until the engine is at full temp.

How is the idle? Better?

67_camaro-2019_vette_Gmpp_LS3495hp-Idle-issue - cringer2.hpt

Idle seems great.. it drops down low but does not stall. Added two channels requested and took for a cruise. Only started logging post 180 degrees of temp.
tune file = Cringe2
tune file and log attached.

Thank you all so much for the help and opportunity to learn... I am grateful

[Cringer]

Idle seems great.. it drops down low but does not stall. Added two channels requested and took for a cruise. Only started logging post 180 degrees of temp.
tune file = Cringe2
tune file and log attached.

Thank you all so much for the help and opportunity to learn... I am grateful

Here are some more refinements to try. The decel popping is caused by too much airflow, which is a combination of desired idle speed, hitting the lower limit for min final airflow...which causes timing to go negative in an attempt to hit the desired coast down idle rpm target. Here you can see timing goes to -7*. I have made revisions to help alleviate this in the attached tune.

negative timing.jpg

Scanner Channels to add:

• You will also need to add the PID 2310 for Volumetric Efficiency Airflow (g/s) in order to tackle the VVE tuning.
• You also removed MAF Airflow Sensor Frequency from your channel list, add that back.

Flash this tune and then clear your DTC's. Hopefully the O2 codes go away and the fuel status will go into "CL- Normal". However, it looks like your throttle pedal is throwing fits....maybe time to replace it? Wiring issue?

P2138 - Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation (Permanent)

67_camaro-2019_vette_Gmpp_LS3495hp-Idle-issue - cringer3.hpt

[Xlexustech]

Here are some more refinements to try. The decel popping is caused by too much airflow, which is a combination of desired idle speed, hitting the lower limit for min final airflow...which causes timing to go negative in an attempt to hit the desired coast down idle rpm target. Here you can see timing goes to -7*. I have made revisions to help alleviate this in the attached tune.

negative timing.jpg

Scanner Channels to add:

• You will also need to add the PID 2310 for Volumetric Efficiency Airflow (g/s) in order to tackle the VVE tuning.
• You also removed MAF Airflow Sensor Frequency from your channel list, add that back.

Flash this tune and then clear your DTC's. Hopefully the O2 codes go away and the fuel status will go into "CL- Normal". However, it looks like your throttle pedal is throwing fits....maybe time to replace it? Wiring issue?

P2138 - Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation (Permanent)

67_camaro-2019_vette_Gmpp_LS3495hp-Idle-issue - cringer3.hpt

somthing really odd happened... prior to the drive that created this log... pulled the car out no problem.. hooked up the HP tuners and got a message . Software update required.. when i tried to connect..

I tired to resync. but It just hung... .. then my petal stopped responding at all .. .. finally connected I could seet the throttle going to 80% + when i put my foor on it.. but no change in RPM.. shut car off.. checked coneections.. . same.. disconnected HP tuners.. killed power to the car (battery cutoff switch). started car up throttle was happy connected fine.. then I drove it.

[TheMechanic]

Don't do any software updates. If it forces make sure ignition isn't on.
As a side note your E38 shows a 2009. Odd because they didn't do permanent codes until 2010. That's the big desire of using E38 2009 because you get the higher flow rate air and injectors without permanent codes.

[Xlexustech]

Don't do any software updates. If it forces make sure ignition isn't on.
As a side note your E38 shows a 2009. Odd because they didn't do permanent codes until 2010. That's the big desire of using E38 2009 because you get the higher flow rate air and injectors without permanent codes.

Thank you.. I wont do that again... it through me for a bit of a tailspin when the pedal stopped responding.

[Xlexustech]

Here are some more refinements to try. The decel popping is caused by too much airflow, which is a combination of desired idle speed, hitting the lower limit for min final airflow...which causes timing to go negative in an attempt to hit the desired coast down idle rpm target. Here you can see timing goes to -7*. I have made revisions to help alleviate this in the attached tune.

negative timing.jpg

Scanner Channels to add:

• You will also need to add the PID 2310 for Volumetric Efficiency Airflow (g/s) in order to tackle the VVE tuning.
• You also removed MAF Airflow Sensor Frequency from your channel list, add that back.

Flash this tune and then clear your DTC's. Hopefully the O2 codes go away and the fuel status will go into "CL- Normal". However, it looks like your throttle pedal is throwing fits....maybe time to replace it? Wiring issue?

P2138 - Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation (Permanent)

67_camaro-2019_vette_Gmpp_LS3495hp-Idle-issue - cringer3.hpt

Will do .. sorry I messed up the Channels.. turning off MAF Frequency.. I started keeping a log of any channel updates, its not in the log so I must have done that accidently. Ill get that tune loaded up and another scan log later this week.

[Xlexustech]

I've been learning how to add a PID.. so that I could add 2310 for Volumetric Efficiency Airflow (g/s) ... I found how to add through the math function. I found this formula for the expression. Before adding I wanted to verify it is correct.

MAF [g/s] = Mair ∙ Vd ∙ nvol ∙ (MAP – (patm/CR)) / (R ∙ IAT)

[Cringer]

I've been learning how to add a PID.. so that I could add 2310 for Volumetric Efficiency Airflow (g/s) ... I found how to add through the math function. I found this formula for the expression. Before adding I wanted to verify it is correct.

MAF [g/s] = Mair ∙ Vd ∙ nvol ∙ (MAP ? (patm/CR)) / (R ∙ IAT)

You want the one labeled Mass Flow Rate. The 'rate' being the keyword as that is g/s, or lb/hr, or bald eagles/fortnight, whatever units you like. You can add the other one if you like but is not usually critical.

VVE.jpg

[Xlexustech]

Screenshot (6).png

Got it all set.. when I looked at the XML it did not show me 2310. Maybe you meant 2301 .. its added now

<channel ParameterID="2301" Interval="00:00:00.2000000"/>
<channel ParameterID="2311" Interval="00:00:00.2000000"/>
<channel ParameterID="2517" Interval="00:00:00.2000000"/>
<channel ParameterID="2320" Interval="00:00:00.2000000"/>

[TheMechanic]

I've been learning how to add a PID.. so that I could add 2310 for Volumetric Efficiency Airflow (g/s) ... I found how to add through the math function. I found this formula for the expression. Before adding I wanted to verify it is correct.

MAF [g/s] = Mair ∙ Vd ∙ nvol ∙ (MAP – (patm/CR)) / (R ∙ IAT)

Cringer has a layout you could use in his VVE youtube video. Download that and change the layout to his.