P0016 datalog assistence

[Icecreamtruk]

Originally Posted by Packofcrows

get maf cleaner and clean it. Start with cheap fixes.

I would totally start with cheap fixes, but this has nothing to do with the MAF sensor doesnt it? Its cam gear position related, so only the cam sensor, the cam sprocket or the ECU should be related. Oil might have something to do (since this all works based on oil pressure), but I dont see how AFR has anything to do with it.

Edit: unless you mean get MAF cleaner and use it on the cam sensor connection, then yeah, you could start there I guess (if it can be used that way, I dont know).

[blackfireball5]

@steve99

I went ahead and tested for boost leaks. I found a handful of small leaks and addressed them.

Unfortunatly, it doesn't appear to have made a difference.

Updated log:

http://www.datazap.me/u/blackfirebal...ata=6-10-11-21

I'll get some maf cleaner and see if that helps.

[steve99]

Originally Posted by blackfireball5

@steve99

I went ahead and tested for boost leaks. I found a handful of small leaks and addressed them.

Unfortunatly, it doesn't appear to have made a difference.

Updated log:

http://www.datazap.me/u/blackfirebal...ata=6-10-11-21

I'll get some maf cleaner and see if that helps.

Yeah still got high negitive ltft at low rom\ idle and it gets better as rpm and hence air flow increases and by 3000 it looks ok.

It posible its a maf sensor issue or leaking injector.

Do you have someone you could swap maf sensors with ?? As they are quote expensive to buy,

The other thing that looks rearly suspect is fhe manifold pressure it reading up to almost 1 bar pressure which is about 14 psi boost at 1500-2000 rpm seems increadably high.

I think it looks like you have a bad MAP sensor ie manifold pressure sensor, this could be effecting tune they are known to fail ight be worth seeing if you can swap in one for a test must be same one you have if its non standard

Im assuming this tune has run ok previously eith the current injectors and setup so we can rule out badly scaled port injectors, and your not running flex fuel kit.

Good video here on diagnosing issues with ltft

[blackfireball5]

I have a boost gauge and it does not reflect 14 psi of boost at that rpm. I wonder what is causing that.

Would the EVAP hose under the Intake Manifold cause these symptoms if it popped off?

I was just doing some reading and this issue popped up in my searching. I had also remembered that a P0441 code was the other code I had my tuner remove from the tune to get the slip light to go away.

I'm going to check that as well.

Fun fact, I actually have another maf sensor I can test with. A while back, I thought I had a bad maf sensor so I bought one. Turns out one of the wires in the maf harness had come loose. I had a shop source me a new one and install it.

I wonder if something with the work that they did is actually not correct. Hm.

[blackfireball5]

Or wait, is the maf sensor that is located post intercooler, but pre intake manifold different than the "map" sensor? I might be confusing the two.

Edit:

Oh I see now. Right. The mpa sensor is on the top right of the intake manifold.

[blackfireball5]

Some extra info on my setup that may or may not be relevant:

I have a dual radium catch can setup.

The PCV can on the right, vents to atmosphere.

The crankcase can on the left has a check valve between the intake manifold and the catch can. Then it routes from the can to the crankcase.

I'm like 99% sure that the check valve is flowing the proper direction (intake manifold --> can --> crankcase) but playing devils advocate, if that check valve was on backwards, would it cause this problem?

Photo of catch can setup:

https://goo.gl/photos/jXFHFnYjeYezZ7Qg8

[steve99]

Im assuming the ecutek log is correct, the MAP (pressure) sensor is in BAR and it seems to be reading incorrect values

[blackfireball5]

Originally Posted by steve99

Im assuming the ecutek log is correct, the MAP (pressure) sensor is in BAR and it seems to be reading incorrect values

Hm. Ok. I will look into that.

So correct me if I am wrong. (I watched the video, knew about 75% of it, but it really clarified and solidified my understanding of fuel trims)

What is happening to my car is for an unknown reason, my car is running very rich, at idle, but not under throttle. This is why the ltft reads -22.7 under idle but bounces back to 0 under throttle. If the MAP sensor is reporting an artificially high number, the car would think it needs to add more fuel than is necessary to compensate. My car has learned this imbalance which is why it is showing up in the ltft. Does that sound correct?

[steve99]

Originally Posted by blackfireball5

Hm. Ok. I will look into that.

So correct me if I am wrong. (I watched the video, knew about 75% of it, but it really clarified and solidified my understanding of fuel trims)

What is happening to my car is for an unknown reason, my car is running very rich, at idle, but not under throttle. This is why the ltft reads -22.7 under idle but bounces back to 0 under throttle. If the MAP sensor is reporting an artificially high number, the car would think it needs to add more fuel than is necessary to compensate. My car has learned this imbalance which is why it is showing up in the ltft. Does that sound correct?

yes thats correct, for some reason the ecu is needing to compensate for and overfueling (or perceived overfueling) situation and its doing this by using a large negative fuel trim.

This may or may not be related to the MAP (pressure) sensor which seems to be reading very high levels of boost pressure at low rpm.

Usually fueling problems are to do with injectors , mas air flow sensor MAF, or oxygen sensor or air oe exhaust leaks ect.


now as you boosted and using ecutek, its possible the tuner has used a custom map setup that ties manifold pressure to fueling OR you using a speed density tune which used intake air temps and manifold pressure to determine fueling. If you on a speed density tune them MAP reading will effect fueling a lot. Maybe talk to tuner

[Kodename47]

I can't view the logs but 1 bar MAP is 0 bar of boost, or atmospheric pressure. 2 bar MAP would be 1 bar of boost....

Poor idle is usually sorted by fueling correctly. Any changed injectors etc?

[steve99]

Originally Posted by Kodename47

I can't view the logs but 1 bar MAP is 0 bar of boost, or atmospheric pressure. 2 bar MAP would be 1 bar of boost....

Poor idle is usually sorted by fueling correctly. Any changed injectors etc?

Hah yeah too late in the day forgot that for absolute manifold press vs boost :-)
Look like the map sensor is fine

Back to the cam code and fueling issue

[blackfireball5]

Originally Posted by Kodename47

I can't view the logs but 1 bar MAP is 0 bar of boost, or atmospheric pressure. 2 bar MAP would be 1 bar of boost....

Poor idle is usually sorted by fueling correctly. Any changed injectors etc?

Bosch 550cc injectors

Originally Posted by steve99

Hah yeah too late in the day forgot that for absolute manifold press vs boost :-)
Look like the map sensor is fine

Back to the cam code and fueling issue

Hm, gotcha. So when it is below 1 bar it's showing vacuum. Got it.

[blackfireball5]

The longer I look at this and the more I read the more I think it could be a leaking injector. It is such a drastic amount of overfueling happening after throttle.

Look how even the stft has to drastically compensate for the excess fuel to maintain stoichometyry.

http://datazap.me/u/blackfireball5/l...5&mark=709-661
@steve99

What is "injection time direct final ms"? Can't seem to find any information on this parameter with Googling. There seems to be some kind of fluctuation happening during this rich event at the link above.

[steve99]

Originally Posted by blackfireball5

The longer I look at this and the more I read the more I think it could be a leaking injector. It is such a drastic amount of overfueling happening after throttle.

Look how even the stft has to drastically compensate for the excess fuel to maintain stoichometyry.

http://datazap.me/u/blackfireball5/l...5&mark=709-661
@steve99

What is "injection time direct final ms"? Can't seem to find any information on this parameter with Googling. There seems to be some kind of fluctuation happening during this rich event at the link above.

Thats the amount of time the direct injector is opening in milleseconds.

Unfortunatly with these cars being duel injection system makes things more conplex.

Their is tables in tune that determine the ratio of port and direct injection used at any given time based on load and rpm. Standard setting at or near idle is arroind 30% port and obviously 70% direct. To achieve the desired fuel delivery. However tuners often cgamge this ratio when using bigger injectors to rely more heavily on the port injection system. The pi di ratio also changes with load and rpm see table below, but tgis is stock tune, yours may be different