C5 z06 - Full LEAN when WOT - 22.1 AFR

[chase1873]

This post has been edited based on the responses from individuals below to reflect my most up-to-date issues.

Hey guys. Looking for some help. Tune and Log attached.

I have a 2002 c5z06. I am currently experiencing a P0103 error and reduced engine power. When this error occurs the is the car now in SD mode? I believe the P0103 is due the MAF freq set to 0 and to MIL of first error, by why does it enter reduced engine power mode? When it goes into reduced engine power it revs up to about 2800rpm. This can been seen when rolling in the log at 1min and when stopped in the log at from 1:40 to 2:00. Is the high rpm due to airflow values in the tune wrong or a effect of the reduced engine power mode?

Previously the car was going into a full lean condition when WOT. Where my wide-band would read ~22:1 and the narrow band would read ~0.050mv. These issues started with the addition of ID1000 injectors, a fast 102 intake, and a NW102 TB. At the advise of members I updated my original tune such that:

Engine Diag- Airflow - P0121 Max 100KPa
Engine Diag- Airflow - P0121 Min 0 KPa
Engine Diag- DTC - P0101, 102, 103 to MIL on First Error


The car will idle and drive (obv needs tune work) briefly until it triggers into reduced engine power mode. I only have a few short trips on the setup as I cannot go WOT. Something must be wrong. What am I missing?

Any thoughts and suggests would be appreciated.

Modifications are:
LS2 swapped
235/242 .621"/.592" 111+3 cam
Headers back exhaust
Fast 102 intake
NW 102 TB
ID1000
Fast fuel rails

Chase z06 BTR4 - Chase - V5 - Speed Density.hpt
Chase_zo6_BTR_102in_v5_SD.hpl

[DougO]

Are you using a wideband at all? you need to reduce your upper range in your VE table, its best to tune with a wideband and build a table so you can tune using an EQ error and apply that to your VE table. Then move on to the MAF, in engine diagnostic you need to be at 100KPA on the P0121 for a cam that size, the first 3 MAF dtcs need to be error on first, I see you tried to fail it with ) hertz but the DTCs need to be on first as well.

[chase1873]

Thanks for the reply. I am not sure what you mean by tune using EQ error. Can you give alittle more data. The wide-band is not hooked-up to HPT yet.. whoops. The upper rang of the VE table was not the high originally. I just drastically increased the values as a method of debugging.

I updated the tune as follows:
Engine Diag- Airflow - P0121 Max 100KPa
Engine Diag- Airflow - P0121 Min 55KPa
Engine Diag- DTC - P0101, 102, 103 to MIL on First Error

[mecanicman]

Your car is still in dual airflow mode. Its referencing the mass airflow sensor entirely above 4000 rpm. Adding to the VE table will do nothing as you have seen.

[chase1873]

okay thanks. does setting DTC codes P0101-103 take it out of 'dual air mode'?

I thought setting the MAF hertz to 0 did this, but I was clearly wrong.

[DougO]

okay thanks. does setting DTC codes P0101-103 take it out of 'dual air mode'?

I thought setting the MAF hertz to 0 did this, but I was clearly wrong.

yes

[chase1873]

yes

Okay so I updated the tune and went for a quick ride.

Same issue. A new log and tune is attached to this post.

I am missing something. Rookie skills. I appreciate the help, this is looking like a tune issue not a hardware issue which is a relief.


Chase_zo6_BTR_102in_v4.hpl
Chase z06 BTR4 - Chase - V4.1.hpt

[DougO]

Thanks for the reply. I am not sure what you mean by tune using EQ error. Can you give alittle more data. The wide-band is not hooked-up to HPT yet.. whoops. The upper rang of the VE table was not the high originally. I just drastically increased the values as a method of debugging.

I updated the tune as follows:
Engine Diag- Airflow - P0121 Max 100KPa
Engine Diag- Airflow - P0121 Min 55KPa
Engine Diag- DTC - P0101, 102, 103 to MIL on First Error

Make P0121 0

[chase1873]

Chase z06 BTR4 - Chase - V5 - Speed Density.hpt

Chase_zo6_BTR_102in_v5_SD.hpl

Okay. I am still stumped here. I am now getting a P0103 error and reduced engine power mode. I got this error multiple times in the log attached here and cleared it via the on board DIC.

I.E. 1 min into the log the car went into reduced engine power and held a constant ~2800rpm. When this error occurs the car is now in SD mode? Why is it also reduced engine power?

I believe I addressed all the issues regarding SD vs MAF in the tune, but now cannot go WOT due to the reduced engine power mode. The VE and MAF table need tuning, I see that, I will get to them when I can actually drive the car.


Thanks in advanced for the help.

[chase1873]

bump for some tune help. I took the MAF out today to clean it. I will check the results tonight, but I think this is a tune problem.

[chase1873]

Update:

Looks like I got the tune settings correct. Now the car appears to be running on the VE table and responding to changes. The key was setting code P0103 to "No MIL Light". When P0103 was set to MIL on first the car would go into reduced power mode.

[2xLS1]

Update:

Looks like I got the tune settings correct. Now the car appears to be running on the VE table and responding to changes. The key was setting code P0103 to "No MIL Light". When P0103 was set to MIL on first the car would go into reduced power mode.

I've never seen MAF codes cause REP. Especially MIL on 1st error vs No MIL making any difference with respect to REP. REP is a check on the ETC system. And it should be setting a code that has to do with the ETC system. If I had to guess you are probably exceeding the predicted air flow in the Calculated Airmass vs TPS vs RPM P1514 table. Try multiplying the entire table by 1.3 or 1.4 to start. Also Maximum Delta Airflow P0101 table, multiply the entire table X3.