Particulate filters frequently release material, with an ash content of 7%

Hello,

I've noticed that my BLS engine is consuming a quart of oil every 250 kilometers, under conditions of 100 kilometers on the highway and 40 kilometers on country roads. What could be the possible causes? What measurement data would be useful?

Data:

- VW Caddy, no modifications.
-BLS engine (2007), 105 hp.
- Particulate filter from Ernst company (filled with silicon carbide) with a 7% fill level.
- New differential pressure sensor.

The injectors have values ranging from -0.8 to .8.

During a drive on the highway covering approximately 50 kilometers, I observed that the particulate filter was slowly and continuously filling up. I don't do trips like this constantly, but I believe I've also had trips where the filter didn't regenerate until after 700 km. However, that was with the old particulate filter.

I still need to observe whether there's an oil consumption issue, but it's possible, because when I changed the oil about 3000 km ago, the oil level was around the middle mark on the dipstick, and now it's showing the maximum level. To rule out a measurement error during the oil change, I'd like to keep monitoring it.

Questions:

- If an injector is responsible, how can you determine this? (Please specify the appropriate tools or methods.)
-What else can I do specifically?

Unfortunately, I don't have much experience with fuel injection systems.

Why was the original replaced?

I don't necessarily find 250km to be unusually short. If the original filter lasted longer under the same driving conditions, then the aftermarket filter is probably the culprit.

chli1976 wrote:

Why was the original replaced? 250km, I don't necessarily find that to be unusually short. If it was longer with the original filter, under the same driving conditions, then the aftermarket filter is probably to blame

.


"It was completely full a long time ago, then cleaned with water, and then replaced with a filter from BM. I replaced it again later, due to defective valve stem seals, when I was doing an engine replacement. Yes, the current filter, which was offered to me as an original equipment part, also has a slightly higher pressure differential." Or can we not trust the term "Erstausrüster"?

The intercooler seems to be sealed properly. At least there's no oil anywhere, and the boost pressure is also correct.

I now have a new gearbox with a longer gear ratio. I usually drive at 2200 rpm at a speed of 120 km/h, whereas before, the same engine speed was achieved at 100 km/h! "But that can't be the reason, since the engine now has to produce more torque when going uphill?"
My test ride was mostly in a relatively flat area. A4 motorway, behind Jena.

"Original equipment manufacturer" refers to the supplier who provided the parts that were installed at the factory. Often, products are advertised as being "original equipment manufacturer quality," but this term ultimately doesn't convey much specific information.

"With my previous Passat 3C, manufactured in 2007 and equipped with a BMP engine (140 hp), the longest distance between regenerations was just under 400 km. The driving profile was exclusively long distances (75 km in each direction, highway and country roads, using cruise control at 130/100 km/h). There were only a few villages, no city, and no traffic lights." It's hard to find something more suitable for the DPF.

I therefore consider your car's 250km range to be only slightly better than what I used to get with my old Passat. However, the Caddy may also have a higher fuel consumption, which could already be a reason for more frequent regeneration cycles.

"Nevertheless, it would be useful to log the DPF values. Does the calculated soot mass trigger the regeneration, or is it the differential pressure?" Do the LMM (mass airflow sensor) and LD (lambda sensor) readings correlate in time and with the LD build-up, such that an air intake problem can be ruled out?

Regards,
Guste.

Hello Martinii,

Not exactly the same, but my Passat 3C8 with engine code CBDC burns off the particulate filter every 300 to 400 km. Euro5 emissions scandal with a software update. Currently has 313,000 km on the odometer. "I had the original diesel particulate filter flushed approximately 20,000 kilometers ago, and I reset the equivalent fill level to 25,000 kilometers using VCDS, which corresponds to roughly 6% of the maximum ash load."

If I drive too conservatively (with a maximum cruise control speed of 80-110 km/h), the interval becomes shorter. "When I drive above 140 km/h (approximately 87 mph) at 2500-3000 RPM, the regeneration interval becomes slightly longer due to passive regeneration. Would 250 km (approximately 155 miles) be a reasonable distance, considering a low-RPM driving profile and a slightly higher level of ash content?"

"Lately, I've been resetting the daily mileage whenever it regenerates, because it's annoying in city traffic, and I can alternatively drive on the highway when the opportunity arises."

Greetings.
Christoph.

Rüdi wrote:

An original equipment manufacturer (OEM) is the one that was installed from the factory... often, products are advertised as being "OEM quality," which ultimately doesn't really mean anything specific.

So, I always try to buy original parts now... Actually, I'm increasingly moving in that direction. Often, the original parts aren't much more expensive compared to the aftermarket alternatives. Although, even with aftermarket parts, I always try to buy the premium stuff. Right now!

guste100 wrote:

"Nevertheless, it would be useful to log the DPF values. Does the calculated soot mass trigger the regeneration, or is it the differential pressure?" Do the LMM (mass airflow sensor) and LD (lambda sensor) readings correlate in time and with the LD build-up, such that an air intake problem can be ruled out? Regards, Guste

I'll do that in the next few days, when I'm not spending 16 hours traveling. Thank you for this information!

cj77 wrote:

Hello Martinii, If I drive too conservatively (with a maximum cruise control speed of 80-110 km/h), the interval becomes shorter. "When I drive above 140 km/h (approximately 87 mph) at 2500-3000 RPM, the regeneration interval becomes slightly longer due to passive regeneration. Would 250 km (approximately 155 miles) be a reasonable distance, considering a low-RPM driving profile and a slightly higher level of ash content?" "Lately, I've been resetting the daily mileage whenever it regenerates, because it's annoying in city traffic, and I can alternatively drive on the highway when the opportunity arises." Greetings. Christoph

Sounds like my driving profile, over the past few years, when I'm traveling for work .
Right now, I'm only doing long-distance routes. Mostly 300 to 1000 kilometers in a single day...

guste100 wrote:

"Nevertheless, it would be useful to log the DPF values. Does the calculated soot mass trigger the regeneration, or is it the differential pressure?" Do the LMM (mass airflow sensor) and LD (lambda sensor) readings correlate in time and with the LD build-up, such that an air intake problem can be ruled out? Regards, Guste

Hello,

Today I did a logging trip with blocks 3, 10, and 11. The diesel particulate filter starts its regeneration process when the load reaches 40%, and then, during highway driving at 2000 RPM, it takes approximately 20 kilometers to complete the regeneration cycle. I may be able to perform a logging run shortly before and after the distillation process next week, if it is still necessary based on the values I have provided.
The diesel particulate filter is currently loaded with 9mg of ash.
The engine itself, without any attached components, currently has a mileage of 204,000 km.

-From second 5 to 9.9, roll freely in neutral without engaging any gear.
-From second 10.41 to 28.6, full power in 3rd gear. Gang.
-From second 30.23 to 40.1, return to idle speed.
- From second 57.29, at 2000 rpm, I simulated driving on the highway. Where the engine speed slightly drops, there's a curve followed by a slight uphill climb at speed 4. Okay.


If I only drive on the highway, without any traffic jams, at 2000-2100 RPM, the particulate filter starts to regenerate after 310 km. The vehicle weighed between 1700 and 1800 kg at that moment.

Hi.

Quote:

If I only drive on the highway, without traffic, at 2000-2100 RPM, the particulate filter starts to initiate a regeneration cycle after 310 km.

That sounds okay to me. It is conceivable that increased soot emissions during load changes could lead to the DPF becoming clogged more quickly.

Let's see if...
- the intake manifold, including LLK means "charge air cooler," and when it's clogged, it restricts airflow to the engine (less air enters the engine than usual).
- that the turbocharger is leak-free, the EGR pipes are leak-free, and that things like the temperature sensors screwed into the turbocharger are properly and securely tightened. Here, valuable power is lost for the loader, and it can pump less fresh air into the engine.
- that the AGR valve closes properly and doesn't get stuck (exhaust gases shouldn't enter the intake manifold, but they do if the valve is malfunctioning).

Best regards, Rainer.