Runs lean after 10 mins or so

[Dang0r3]

I have MS2 v3.0 on a turbo m20. I can drive the car for a few minutes then the afr's go up high,
sometimes the engine shuts off not getting enough fuel I'm assuming.
I have WUE, ACE, disabled and a few other things I believe.
I will post up my tune and a datalog when I get home today.

Any help with things I can try would be great.

[rickb794]

You need to monitor fuel pressure and voltage to the pump, and you should get your answer.

Note: don't bring fuel pressure inside the car, duct tape a gauge to the outside of the windshield.

If this does not provide any clues look at your TS settings and CLT calibration

[Matt Cramer]

[Dang0r3]

Well finally here is my msq. I need to get a current datalog of the car now.

I checked the fuel pump voltage and it doesn't change once the car starts running lean.
I've been busy with school, I have not got around to checking the fuel pressure.
Would the fuel pressure drop right away once the car is warm? The problem happens
I drive the car after it is warmed up for 10 mins and then the car will start to run lean
at first trying to build boost then soon after the idle AFR goes up real high and car dies

[87quest-TSI]

I'm no pro, but it looks like your dead time is a bit high.
It doesn't look like you have a o2 sensor.
You need to add some warm up enrichment seeing as you have none.
looks like your trying to idle to lean.

[slow_hemi6]

Monitor Air Density Correction and see if your IAT sensor is getting very hot and ripping heaps of fuel out.

[Dang0r3]

I do have a wideband hooked up. I may have it disabled in the tune I uploaded. I was troubleshooting seeing
if the wideband was reading incorrect.

I drove the car on a cold day and the IAT never got above 50 F and then the car started to run lean after about 10 mins of driving.
On a warm day it got as high as 95 F while the car was on. Cars CLT stays around 185 - 192 F. I have my IAT sensor tapped directly into my throttle body
outside the valve.

[Matt Cramer]

Please also attach the data log of the behavior.

[Dang0r3]

Okay there is two data logs

Car warmed up and drives fine

2014-12-19driving.msl

Car warmed up and runs lean about halfway through when trying to build boost

2014-12-19drivingwarm.msl

[slow_hemi6]

To me it seems to need fuel in general. Got to richen up the load VE map values as it's leaning out under any load and worse under boost. Your Accel Enrich is doing next to nothing. Everytime you do that thing when you tap the throttle ( a lot) I presume you think your giving extra fuel and air, you are just driving it leaner with no accel enrich and very little extra pw being introduced.

[rickb794]

Does your warm up enrichment curve end at less than 100%?

[Dang0r3]

I tap the gas a lot only because it needs a new battery and I don't want to get stuck on the street and have to push the car.
If it goes too lean the car stalls out.

How come for the first few minutes the car will run decent and then after a little while
the car will run lean when going into boost? Any ideas?

If it needs a more richer VE then wouldn't it run lean all the time instead of happening after a certain amount of time?

I'm still very new to all this, all of this is helping me understand tuning and the car more.
Thanks for all your help

My warm up enrichment isnt tuned, but it does not end at less than 100%

[slow_hemi6]

Well in that log you are not using the same part of the map (stable cruise) in the early log, as when you are under load and boost which really are the same thing just increasing load the further you go into boost. Then later in the log you do not let it stabilise back into the same cruise because you keep messing with the pedal.
When you review your own log go to the right hand upper corner and open up the table view with the left hand arrow and load your current tune. Then as you step through your log you can see what cells the ecu is using per step. Very different parts of the map cruise vs load. Then when you can see which cells are being used and are needing more fuel, you can increase the VE in those cells. This is how you manually tune a table.
If you want to learn to tune then you must watch the tables like this as you step through logs and learn the patterns the engine uses as it transitions and the cells the engine sits in for common stable states.

[Matt Cramer]

The warmup enrichment is set to 100% across the board. I suspect that if you've tuned it rich enough to do a cold start, by the time it's warmed up it is so rich you are getting misfires that make it show up as lean.

[Dang0r3]

I looked at my datalog today and pulled my tune up in the viewer.
I adjusted the cells, but the problem is still there.

So I'll tune the fuel a little lean for start up and adjust the Warmup Enrichment table and see what happens.
It starts up and idles with the AFR around 12-13.

[rickb794]

Tune your VE table with the motor hot only.

Bring up the low temp numbers on WUE to make it run cold.

[Dang0r3]

So I let the car warm up tuned VE and got it to idle around 14.0-14.7, but I still have to adjust the WUE table.
If that doesnt solve my problem I read sometimes the fuel pump will heat up after a few mintues of being used
causing the pump not to flow the rate amount of fuel and making it lean.

[rickb794]

Monitor fuel pressure to see if there is a problem there.