Uni 830 - What should a block 031 look like on a WOT pull?

[groggory]

Here is my what my AFR looks like on a WOT pull right now. (FYI, I'm limiting boost to 10 PSI.) Look at the goofy looking AFR-Request though. Why is the ECU requesting such a bizarre AFR? And if it's requesting such a bizarre AFR, why am I running such a normal looking AFR?

RPM	AFR-Request	AFR-Actual
2520	14.7		14.5824
2640	14.7		14.5824
2800	29.2677		13.7886
2960	29.2677		13.3182
3140	29.2677		13.0977
3340	29.2677		12.8625
3540	29.2677		12.7449
3720	29.2677		12.5244
3900	29.2677		12.5244
4100	29.2677		12.4068
4300	29.2677		12.4068
4520	29.2677		12.4068
4720	29.2677		12.1716
4900	29.2677		12.0687
5040	29.2677		11.9511
5140	14.7		11.9511

[Vegeta Gti]

uhh..weird...it isnt getting proper signal or something. that is...strange...

[groggory]

My rear o2 is clogged if that matters at all

No misfires
No timing pull

[groggory]

^^bump

...for some insight.

[Rac_337]

^^bump

...for some insight.

no codes either?

i've never seen this before.

[groggory]

no codes either?

i've never seen this before.

My MAF is disconnected.

My tune is a Uni 830 MAF'less file. So yes, I'm getting a code for my MAF being disconnected.

[Rac_337]

My MAF is disconnected.

My tune is a Uni 830 MAF'less file. So yes, I'm getting a code for my MAF being disconnected.

shouldnt matter then.

did this just start happening out of the blue?

[groggory]

shouldnt matter then.

did this just start happening out of the blue?

I've been having problems for 4 or 5 months now. I've been down a couple dozen paths trying to figure things out.

My old exhaust had a collapsed cat and was causing me to kill o2 sensors. So during that period I ignored the bad AFR data because I attributed that to the bad exhaust. I have since replaced the exhaust with a 3" 42dd turboback (gorgeous I may add) w/ high flow cat.

So, I'm not sure of the start date of THIS issue. I've been tracking down gremlins for awhile now.

I have it scheduled sometime this week to pull the valve cover and double check the cam to cam timing too. My car spits raw fuel out the tail pipe at idle and fouls plugs like it's nobody's business.

I guess the question here is what would cause the Uni software to give me a requested lambda of maximum value? If I knew what would cause that crazy number to show up I'd have a guess at what's causing some of the other problmes.

[Rac_337]

What does 032 look like while this is going on?

i'd double check the timing like you said. something is causing the fuel dump.

just a theory, but is it possible because of this your ecu is trying to request a super lean condition just to correct for the excess fuel?

maybe FPR is acting funny? thats another thought. do you have a fuel pressure gauge?

how does it run otherwise? like a bag problably im guessing if you see raw fuel out of the tailpipe

[groggory]

What does 032 look like while this is going on?

i'd double check the timing like you said. something is causing the fuel dump.

just a theory, but is it possible because of this your ecu is trying to request a super lean condition just to correct for the excess fuel?

how does it run otherwise? like a bag problably im guessing if you see raw fuel out of the tailpipe

I'll reply back with my 032 on the drive home...

That's possible, but seems like a weird way to correct for it. Seems like the computer would say, "Gimme 13:1 AFR" and then all the other logic would give fuel, take fuel, give more air, take more air, etc to reach that 13:1.

It runs oddly. Sometimes it pulls hard. Sometimes I'll run the revs out and then it'll make a high speed stuttering sound, all my power is taken, and a cloud of black smoke covers the car tail gating me (). At that point I'll ease off the accelerator for a moment then slowly roll it back on and have power again.

My Fuel economy sucks. v10 truck level suck.

If I idle my car in the driveway I leave a black spot behind the tail pipe on the concrete and have to clean it with some APC (all purpose cleaner, unleaded gasoline) to get it off later.

...lol...

[Rac_337]

That's possible, but seems like a weird way to correct for it. Seems like the computer would say, "Gimme 13:1 AFR" and then all the other logic would give fuel, take fuel, give more air, take more air, etc to reach that 13:1.

this is true...also i forgot the me7 can only correct up to 26% which would be 18/19:1 AFR or so....requesting 29:1 is extremely odd.

any chance you can post the raw data log when you get home? im curious to see it.

also when you take a look at your cam to cam timing, double check the vvt tensioner and make sure its in good shape.

when i first had my car i had the vvt shoe crack on me causing a weird running condition too. thing ran like ish. when i pulled the valve cover there were bits and peices of shoe all over the place.

[groggory]

this is true...also i forgot the me7 can only correct up to 26% which would be 18/19:1 AFR or so....requesting 29:1 is extremely odd.

any chance you can post the raw data log when you get home? im curious to see it.

also when you take a look at your cam to cam timing, double check the vvt tensioner and make sure its in good shape.

when i first had my car i had the vvt shoe crack on me causing a weird running condition too. thing ran like ish. when i pulled the valve cover there were bits and peices of shoe all over the place.

http://db.tt/2rdeQBdf

Block 032
-3.9% / 25%

[Rac_337]

http://db.tt/2rdeQBdf

Block 032
-3.9% / 25%

first block is idle, 2nd block is partial/wot correction i believe. corrections are maxing out at 25%. gotta find that excess fuel problem.

a) check cam timing to be sure.

b) try and measure fuel pressure with a mechanical gauge while this is happening. tricky i know... i want to take a guess at bad FPR.

[babarber]

im pretty sure its backwards isnt it? negative means excess fuel and a positive # means its adding fuel please correct me if im wrong

[groggory]

first block is idle, 2nd block is partial/wot correction i believe. corrections are maxing out at 25%. gotta find that excess fuel problem.

a) check cam timing to be sure.

b) try and measure fuel pressure with a mechanical gauge while this is happening. tricky i know... i want to take a guess at bad FPR.

Cam timing will be checked later this week. Overall timing is spot on (timing belt)

I have an in-car boost gauge and in-car fuel pressure gauge. At 10 PSI boost (according to boost gauge) I have 55 PSI fuel pressure. Which for a 3 bar fuel pressure regulator it's spot on.

At idle, 20 in HG Fuel pressure = 34 PSI

At idle with FPR disconnected from vac fuel pressure = 43 PSI

[groggory]

im pretty sure its backwards isnt it? negative means excess fuel and a positive # means its adding fuel please correct me if im wrong

positive means the ECU is adding fuel

[T-Boy]

You sure you have an ECU with Uni 830 flashed on it? 100%

[groggory]

You sure you have an ECU with Uni 830 flashed on it? 100%

100% sure. It shows Uni 830 in Vag Com

[01ttgt28]

My MAF is disconnected.

My tune is a Uni 830 MAF'less file. So yes, I'm getting a code for my MAF being disconnected.

I don't get it you have a Maf less file but you get a code when your maf is unplugged???

[groggory]

I don't get it you have a Maf less file but you get a code when your maf is unplugged???

Yeah...I worked with Uni for awhile on that one. They had me plug it in, clear a code, unplug it, back and forth in this combination and that....in the end they said, "Don't worry, your file is MAF'less"

The bummer is I lose my traction control because the ECU sees the MAF as missing.

[01ttgt28]

Yeah...I worked with Uni for awhile on that one. They had me plug it in, clear a code, unplug it, back and forth in this combination and that....in the end they said, "Don't worry, your file is MAF'less"

The bummer is I lose my traction control because the ECU sees the MAF as missing.

I have a uni 830 file no maf all deletes and i got no Maf codes??
Are you wide band???

[burkechrs1]

It shouldn't throw a code if the MAF is tuned out.

I would put money on your mafless tune not being 100% correct..

[Rac_337]

even if the maf was unplugged, threw a code, and it was a MAF tune for example; it would revert to other tables and be able to keep the trims in range if the map is correctly built no?

[groggory]

It shouldn't throw a code if the MAF is tuned out.

I would put money on your mafless tune not being 100% correct..

They don't keep copies of each tune they build for people, so what are my options here? Send it to Canada and be out a car for 3-4 weeks? lol. Lavi checked on this with Mike Z. Maybe I'll give them a call again. They checked this out back in Dec of 2010

Update: Reset fuel trims and did some more pulls.

The crazy AFR request is still as crazy as ever.

The actual AFR is a little higher, closer to 12.5.

Sounds like I have two issues here..

1) Potential problem with my cam to cam timing

2) Software issue/ ECU issue

http://dl.dropbox.com/u/9842192/Mygt...2-031-115.xlsx

[Rac_337]

just had a quick thought about this...wouldn't cam to cam timing being off give you a P17748 - Cam timing, incorrect correlation code?

just throwing ideas out there to help narrow down.

[T-Boy]

Thought: If you're running so rich that you're dripping raw fuel out of your exhaust, you should stop driving and logging. You could potentially wash your cylinders down and ruin your rings....amongst other things.

[groggory]

Thought: If you're running so rich that you're dripping raw fuel out of your exhaust, you should stop driving and logging. You could potentially wash your cylinders down and ruin your rings....amongst other things.

That would suck

[01ttgt28]

The graph was with or without the Maf ??
And on all your delets do you have any open?? did they all get resistored??
Just asking??

[groggory]

The graph was with or without the Maf ??

No maf on this car

I'll do a leak down test tomorrow

[babarber]

just a thought... try plugging in a maf and do a log

[01ttgt28]

just a thought... try plugging in a maf and do a log

X2

[18T_BT]

what T-Boy said x2

check your 02 wires to make sure they aren't frayed, trace them as close as you can to the ecu to
make sure nothing is out of the ordinary...look into block 030 (sorry I haven't used vagcom in a while) and check out 02 voltage, it should tell you if the sensor is bad http://forums.vwvortex.com/showthrea...ips-and-Tricks

what does the car do when you plug the MAF back in? does it run better?

[groggory]

Newest logs...

I plugged the MAF in and cleared codes. This in turn reset the fuel trims.

BTW...I didn't graph it, but the crazy AFR request is still there. Maxing out just like before.
Here's a pull for ya...
http://dl.dropbox.com/u/9842192/Mygt...2-031-115.xlsx

[18T_BT]

you are having a HW issue it seems

[groggory]

you are having a HW issue it seems

I agree