I need help reading datalog

[Dultan]

Hey,
While I drive the car normal speed at highway i feel the car cutting power for a second afr1 & afr2 going rich and lean car driving not smooth. I do datalog i see intake vct2 stop reading at datalog but I don’t know what that mean or what is the problem. Vct Solenoid new

https://datazap.me/u/sultan-gt55554...22-23-24-25&solo=0-24-32-34-38&zoom=1318-1342

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[robvas]

What air intake are you using?

 

[Dultan]

What air intake are you using?

Hi robvas
It’s stock whipple stg1 intake with whipple Airfilter

 

[junits15]

This log is really short, is this only a few seconds? Your lambda seems fine, but i can't really tell because the log is so short. What device did you use to capture this?

 

[Dultan]

This log is really short, is this only a few seconds? Your lambda seems fine, but i can't really tell because the log is so short. What device did you use to capture this?

It’s ngauge i will attach more log

 

[mejohn50]

I am going to just take a stab in the dark since we don't have a lot to work with. We need to know what time stamps in the logs are exhibiting the issue.

In log0024, there is one spot that is obviously odd. The RPM drops out, which is why I saw it, and a few other things drop out with it.

We can see ECT, ACT, IAT2, afr_matured, AFR1, and IMRC_desired drop out. At the same time both VCT2 channels drop to zero.

Here is a screenshot of the RPM dropping out in my scanner layout, and then screenshots of the channels list before and during the drop.

RPM drop:

Before drop:

During drop:

No idea what's going on, but it seems like all those channels dropping out at the same time could be a clue.

Personally, I would start with some troubleshooting basics since we don't know much else that's going on. I would check the battery, charging system, and all fuses to make sure that is all working properly. Once that is verified, I would re-flash the tune file on the car, if possible do "write entire file" or similar, and then see what happens.

 

[Dultan]

I am going to just take a stab in the dark since we don't have a lot to work with. We need to know what time stamps in the logs are exhibiting the issue.

In log0024, there is one spot that is obviously odd. The RPM drops out, which is why I saw it, and a few other things drop out with it.

We can see ECT, ACT, IAT2, afr_matured, AFR1, and IMRC_desired drop out. At the same time both VCT2 channels drop to zero.

Here is a screenshot of the RPM dropping out in my scanner layout, and then screenshots of the channels list before and during the drop.

RPM drop:

Before drop:

During drop:

No idea what's going on, but it seems like all those channels dropping out at the same time could be a clue.

Personally, I would start with some troubleshooting basics since we don't know much else that's going on. I would check the battery, charging system, and all fuses to make sure that is all working properly. Once that is verified, I would re-flash the tune file on the car, if possible do "write entire file" or similar, and then see what happens.

Thanks mejohn50 for your reply i will check what you mention.
Also i forgot to mention the car stall sometimes when i slow down at low speed.
I do also do smoke test no leak

 

[mejohn50]

Thanks mejohn50 for your reply i will check what you mention.
Also i forgot to mention the car stall sometimes when i slow down at low speed.
I do also smoke test no leak

In general, I kinda hate to be like this, but the state of the S550 platform is such that you probably need to do this...

You need to talk to your tuner. I don't know who tuned the car (I can guess) but most all "mainstream" tuners want to keep you as locked out and as in the dark as possible. You need to talk to your tuner and ask them for help or find a performance shop in your area that you trust (don't know where you are in relation to MAP, but they seem to have a good reputation).

 

[Dultan]

When car stall i get Red warning message charging system it’s show for a second I turn on engine again every thing normal no CEL
The battery in the car from just 7 months brand new oem from dealer.
I send to him log he said everything fine but i know something wrong in the car no help from the tuner that’s why I don’t want to ask him anymore.

 

[Dultan]

One more clear log once slow down for light signal car stall

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