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Chevy Cruze 1.4 2017 Rich Condition

  • Tanriverdiyev
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2 days 7 hours ago #92292 by Tanriverdiyev
Chevy Cruze 1.4 2017 Rich Condition was created by Tanriverdiyev


 

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.

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2 days 2 hours ago #92293 by Omega
Replied by Omega on topic Chevy Cruze 1.4 2017 Rich Condition
I’m not sure about anyone else but your pictures for me are coming through as just black boxes

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2 days 59 minutes ago #92294 by Tyler
Replied by Tyler on topic Chevy Cruze 1.4 2017 Rich Condition
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.

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1 day 23 hours ago - 1 day 23 hours ago #92295 by Tanriverdiyev
Replied by Tanriverdiyev on topic Chevy Cruze 1.4 2017 Rich Condition
Thank you for your quick reply. It is first time and i though that I attach the files.
Last edit: 1 day 23 hours ago by Tanriverdiyev.

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1 day 23 hours ago #92296 by Tanriverdiyev
Replied by Tanriverdiyev on topic Chevy Cruze 1.4 2017 Rich Condition

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. 

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1 day 1 hour ago - 1 day 47 minutes ago #92299 by Tyler
Replied by Tyler on topic Chevy Cruze 1.4 2017 Rich Condition
 

 

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? 
Last edit: 1 day 47 minutes ago by Tyler.

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