P0016 datalog assistence

[blackfireball5]

Gotcha, so is the fluctuation i'm seeing at that point relevant?

[Kodename47]

I wonder if the latencies are set correctly. There are settings for min DI and PI volumes, these also need to be corrected when changing injectors. If bigger injectors have been installed, usually the setup is the cause of poor idling and fueling error.

[blackfireball5]

Originally Posted by Kodename47

I wonder if the latencies are set correctly. There are settings for min DI and PI volumes, these also need to be corrected when changing injectors. If bigger injectors have been installed, usually the setup is the cause of poor idling and fueling error.

So, the car was professionally tuned by Pure Automotive under the previous owner.

I can confirm that the car used to run properly under this tune and settings at one point in time.

It still had the idle dip, but at least the ltft was properly at 0.

http://www.datazap.me/u/blackfirebal...data=5-9-10-19

This was from like, 2014.

[blackfireball5]

Does anyone know what the ideal maf sensor voltage should be around idle? I notice that mine in my log is reading anywhere from 1 to 1.5 v at idle. This article I just read is stating, "The output signal is typically about 0.7 volts at idle and about 4.5 volts at wide-open throttle."

http://www.autoserviceprofessional.c...ow-sensor-lies

There's also a section in here that states, "Usually with a dirty MAF, long-term fuel trim will be negative at idle and become more positive as rpm (airflow) increases. But we just noted that a dirty MAF under-reports airflow; why is long-term fuel trim negative at idle? Actually, given enough time it might start to increase, but on most models it won’t change at idle as long as the short-term trim is able to keep total fuel trim below the code-set criteria (25%)."

I currently have my car at my shop. They discovered the bov was sticking and not moving very smoothly, so they serviced that.

They are testing now to see if that helped, but I am thinking if that does not help, the maf my be where I should look.

I know someone mentioned to clean the maf. I should have done that but I was wrapped up in looking for boost/vacuum leaks.

[blackfireball5]

UPDATE:

So a long time ago, I had an issue where a wire going to my maf sensor was severed. I had that repaired by a shop years ago. After reviewing the log again and doing mroe reading, I suggested to the guys currently working through my issue to look into the maf sensor. They said that hey wiggled the plug to the maf sensor while the car was running and it died. They unwrapped the plug and two wires came out. The previous shop did a crappy job. The new plug was supposed to be here today.

Will update this thread if this solves my problem. Thanks for all the help everyone.