ARL: Extremely high consumption + performance loss

Hey everyone,

I have a Seat Leon ARL with 350,000 kilometers on the odometer.
I received it with a worn-out impeller, but I continued to use it for a while. The fuel consumption was always very high; I found it to be 10-11 liters for short trips and never really less than 8 liters on longer journeys.
The vehicle then received a rebuilt cylinder head and a new camshaft.

Synchronization angle checked: -0.6.

Since then, it's been smoking on cold starts, and it takes 3 seconds of cranking to get it going.

Running style is good, but performance is still lacking. Top speed: 186.
and still, the high consumption.

new parts: Mass Air Flow Sensor (MAF), water temperature sensor, diesel temperature sensor, EGR valve.

Okay, I want to get to the bottom of this, and I hope you can help me analyze the logs. I have no experience with that.

I thought I would log 003-008-011 in the 4th or 5th position. How's it going?

Thank you in advance, and greetings to you .

Which specific data points would be useful to log? I've already logged 003, 008, and 011 in 4th gear at full throttle, but the results weren't very clear, and I couldn't really make sense of the values.

Have you tried using the search function here?
Okay, here's the translation:

"Why don't you try that? The ARL engine isn't exactly the newest model anymore." Perhaps you'll find something there, even something basic, about what the engine needs in terms of data to function properly.

/viewtopic.php?t=3285&highlight=logfahrt

Okay, let's start with this and see if anything is different on your end... or if you can find a couple more ways to analyze your system.

Specifically, please pay attention to the notes regarding the known issues, which are located approximately in the middle.
Okay, I'm ready. Please provide the German text you want me to translate.

I've been searching for days and have already checked many things, but I'm still stuck with my log entries. I was hoping someone would tell me that the "MWBs" (likely referring to some kind of data or reports) are good and that I can extract certain information from them.

I've read multiple times that these large language models are good for getting quick answers, but unfortunately, I can't interpret anything from them.

I'm going to do some logging runs tonight and then post the results.
I'm already looking into it myself, but sometimes certain values don't make sense to me, or I'm not sure how things are supposed to be.

Hi,

Are you doing fake work, or what?
Given the fuel consumption you mentioned, that thing must be belching out smoke like a steam locomotive, and presumably, all the fuel is gurgling out of the exhaust.

Why isn't there a single word about it?

And if the engine is misfiring badly, I would first check if enough combustion air is reaching the cylinders and where it might be going. Everything necessary has already been described.

Best regards, Rainer.

What is "Fake Work" ?

I forgot to mention that there is absolutely no soot, but the only thing is that it smells very strongly of exhaust fumes.

I find it very strange myself .

It's just generally slow.

The turbocharger pressure sometimes briefly spikes to 2 bar when I first start the car; I'm not sure if that's normal.

Could it be that the timing values are incorrect, even though I've read them?

Hello,

Quote:

The turbocharger pressure sometimes briefly rises to 2 bar when I get in the car, which I don't know if that's normal

.
It's not beautiful, but it's also not unusual. The normal boost pressure is already 1.55 bar relative pressure.

Your description doesn't match the problem. Things like having the handbrake engaged while driving, I'll leave out of the discussion, as I assume everyone should notice that.

What does MWB 13 say about idle speed control? Are all 4 burners working and running evenly?

The only thing I can imagine is either completely worn-out camshafts or, overall, insufficient camshaft lift, and the car isn't making a lot of noise because the mass airflow sensor (MAF) is working correctly.

"Please create an acceleration log from 1500 to 4000 rpm in 3rd gear." Completely according to sections 3, 8, and 11 of the MWB guidelines.

Best regards, Rainer.

Hi, thanks for the reply. I'm sorry, I only just managed to get to it.

Would you call that "overswing" or "overboost"? And can it be fixed?

Everything on the car is in working order, including the exhaust system.

The charge air system is 100% leak-proof. The hoses have been replaced and pressure-tested.

Vacuum: The pressure at the VTG is 600 mbar, which is within the target range.

Idling fuel consumption: According to the MFA (Multifunction Display) and VCDS (Vehicle Diagnostic System), it is 1.1-1.3 liters per hour.

I completed the log entry last night, and hopefully, it's usable.

Hi,
How was the consumption measured? Was it based on the liters of fuel pumped at the gas station, or on the kilometers driven? Or is this AI-generated content?
hg
Herbert.

Driven a full tank of gas very fuel-efficiently, mostly on country roads and highways, and achieved a consumption of exactly 8.9 liters.

Okay, so it seems like the advertised consumption of 11 liters per 100 kilometers in the city is accurate.

Question for the PD specialists: While the header text in MWB 003 of the ARL MSG mentions "Exhaust Gas Recirculation, Desired and Actual," doesn't that refer to the air mass?
hg
Herbert.

I'm afraid I can't answer that, but I hope my log will be analyzed again by a specialist.

I have some more logs here that someone might be able to identify an ambiguity in.

I would really appreciate it if you could provide answers.

Sure, here's the translation:

"MFG" is an abbreviation for "Mit freundlichen Grüßen," which translates to "Sincerely" or "Best regards" in English.

Synchronization angle varies from -1.1 to +2.2.

Maybe the dog is buried there, or what do you think?

lucasbrandy wrote:

The synchronization angle varies from -1.1 to +2.2. Maybe the dog is buried there, or what do you think?

Maybe.
Let's assume that the values for boost pressure, air mass, and torque limitation are correct, then there should also be enough air reaching the cylinders themselves. Have the intake manifold and intake channels been checked? Compression confirmed?
So far, you haven't mentioned anything about the status of the injectors (in VCDS: idle behavior, injector status, shift times) or the camshaft.
Here's the translation:

"Let's look at the mechanics: Perhaps the crankshaft position sensor or its holder was damaged. If so, the nice -0.6° synchronization angles are gone. Are the cables, etc., to the camshaft position sensor in order? What is the valve timing like when the engine is disconnected? Is the tensioner wobbling?" Is the planetary gear stuck?
hg
Herbert.