Chevy Cruze 1.4 2017 Rich Condition

 

Hello,
I need your support to understand what is wrong with my car. 1.4L Chevy Cruze II generation. Big fuel consuption, rich condition - LTFT 2% during iddle and apprx. - 25% acceleration. O2 tested and all okay (also was replaced with known good one). Injectors and GDI pump replaced ( oil also). Still reduced power and 14l per 100km in city.
In the attached screenshots in the top you can find purge valve command, rpm, tank pressure and LTFT.

I’m not sure about anyone else but your pictures for me are coming through as just black boxes

Sorry Tanriverdiyev, your screenshots didn't display correctly. I couldn't see that you uploaded or posted them incorrectly. Send them to me at wrenchturnsyou@gmail.com if you like and I can upload them again.

My first thought is an air measurement issue. There's actually a TSB out for it:

static.nhtsa.gov/odi/tsbs/2018/MC-10137584-9999.pdf

Since you already have a scan tool, the easiest test would be to compare the MAF Sensor reading against the Calculated Air Flow. There's no spec, but I like them to agree within .5 g/s at hot idle with no loads on.

Thank you for your quick reply. It is first time and i though that I attach the files.

Tyler wrote:

Sorry Tanriverdiyev, your screenshots didn't display correctly. I couldn't see that you uploaded or posted them incorrectly. Send them to me at wrenchturnsyou@gmail.com if you like and I can upload them again.

My first thought is an air measurement issue. There's actually a TSB out for it:

static.nhtsa.gov/odi/tsbs/2018/MC-10137584-9999.pdf

Since you already have a scan tool, the easiest test would be to compare the MAF Sensor reading against the Calculated Air Flow. There's no spec, but I like them to agree within .5 g/s at hot idle with no loads on.

Thank you in advance. I sent pictures to your email. 
MAF on hot iddle is about 2.5- g/s. Today I will check air filter also. 

 

 

Got your email, no worries. There was something about the original JPGs that Kunena didn't like. I had to take screenshots of your captures to make it work. You weren't doing anything wrong, just Kunena being quirky.

2.5 g/s seems high. How did that compare to the Calculated Air Flow? 

Is that the engine that has the air cleaner housing with the plastic disk that comes off and skews the MAF?

Noah wrote:

Is that the engine that has the air cleaner housing with the plastic disk that comes off and skews the MAF?

Yes it is. LE2
Yesterday I put 4 used MAF sensors there and in 3 of them MAF readings were 2-2.5 g/s. With all 3 sensors LTFT was arround 7-10%. Only on one MAF I got 4g/s but then LTFT went to -30%.  Today I disconnect plug from MAF and got LTFT +11%. Is it means that I need to change MAF?

I was thinking about this design, I have run into this before and Danner made a video about the same issue:
scannerdanner.com/scannerdanner-premium-...dy-james-danner.html