Extreamly slow/long regeneration CAYC, after 100km reg DPF-Light comes also on
Posted: Sat Jun 17, 2023 6:01 pm
Hello,
Second time trying to post here (first post never got approved/disapproved?)
Hopefully this one does because I really need help.
The Situation:
I bought a used VW Golf 6 TDI (CAYC 1.6) about 2-3 months ago.
The car appeared fully functional due to the first 1200Km without problems... presumably because this distance was 98% highway driving (where the output temp was at 407c and it finished the reg in 112Km...).
After this first time, i used the car I'm my normal driving conditions e.g. 2x17km 4 days a week and 2x70Km highway once per week.
I only fuel the car with premium fuel (Shell V-POWER Diesel) (since instantly after purchase) and have switched to high quality oil on the second day of ownership. (The exact fuel and oil works perfectly for years with the 2x Golf 7 2.0 of my parents).
By the way, the car got the vw emission update (around 2018 or so) and i bought it with ecu version 9980 (later updated to 9982 to see if it helps)
The Problem:
After around 400-450km, the active regeneration starts (24g Calculated Soot), which is ok, but it regenerates at a way to low speed of around -109 to -200 mg/km. After exactly 100Km of (continuous) active regeneration, the dpf-lamp lights up and i need to drive another 40-80 km with the light on to get down to 6g Calculated Soot.
This Process has repeated al least 5 times now (and can still be repeated).
Additional Info:
We have no error codes all the time (but error logging generally works on the car)
We replaced the differential pressure sensor, which leaded to smother gas reception on the first 1-5% of the pedal (before the engine was stuttering noticeable when pressing or releasing the first 1-5% of the pedal) so it was likely defect.
The car had around 129500km at the day of the purchase and as we later found out, around 2g of oil ash residue, which we later set to 0 again by mistake due to a miscommunication with the mechanic.
We updated the ecu from version 9980 to 9982 (latest).
The last mechanic I went to had me check the coolant temperature which remains stable at 93-96c when driving. We also did a standing regeneration (which worked without problems but took 35 minutes for 12g calculated to 0g (we didn't measure data during the regeneration)). He also set the value of the oil ash residue to our rough estimate of 35g.
Logs and Data:
I attached a couple of logs (split into different files by me after every change).
I can also provide around 130 Screenshots from the period.
The logs contain driving with and without regeneration.
I also have screen recordings of the last 200Km (of which 140km where regeneration) which i could provide.
Things I have noticed:
During regeneration the dpf input temperature is around 550-650c which is good, but the output temperature seems low with 350-380c?
On the highway I can reach 360c output temp with 400-480c input without active regeneration.
Without the regeneration, the values from the 2 temperatures seem to align to validate each other.
I have read all the (132) posts in the forum and everywhere the output temp is around 500-600c.
Could this be a defect lambda probe not telling the right amount of oxygen to let in, which prevents the soot from burning?
Generally huge thanks for developing the App, it is a godsend in my situation.
Hope you can help me.
Greetings
Chriss
Second time trying to post here (first post never got approved/disapproved?)
Hopefully this one does because I really need help.
The Situation:
I bought a used VW Golf 6 TDI (CAYC 1.6) about 2-3 months ago.
The car appeared fully functional due to the first 1200Km without problems... presumably because this distance was 98% highway driving (where the output temp was at 407c and it finished the reg in 112Km...).
After this first time, i used the car I'm my normal driving conditions e.g. 2x17km 4 days a week and 2x70Km highway once per week.
I only fuel the car with premium fuel (Shell V-POWER Diesel) (since instantly after purchase) and have switched to high quality oil on the second day of ownership. (The exact fuel and oil works perfectly for years with the 2x Golf 7 2.0 of my parents).
By the way, the car got the vw emission update (around 2018 or so) and i bought it with ecu version 9980 (later updated to 9982 to see if it helps)
The Problem:
After around 400-450km, the active regeneration starts (24g Calculated Soot), which is ok, but it regenerates at a way to low speed of around -109 to -200 mg/km. After exactly 100Km of (continuous) active regeneration, the dpf-lamp lights up and i need to drive another 40-80 km with the light on to get down to 6g Calculated Soot.
This Process has repeated al least 5 times now (and can still be repeated).
Additional Info:
We have no error codes all the time (but error logging generally works on the car)
We replaced the differential pressure sensor, which leaded to smother gas reception on the first 1-5% of the pedal (before the engine was stuttering noticeable when pressing or releasing the first 1-5% of the pedal) so it was likely defect.
The car had around 129500km at the day of the purchase and as we later found out, around 2g of oil ash residue, which we later set to 0 again by mistake due to a miscommunication with the mechanic.
We updated the ecu from version 9980 to 9982 (latest).
The last mechanic I went to had me check the coolant temperature which remains stable at 93-96c when driving. We also did a standing regeneration (which worked without problems but took 35 minutes for 12g calculated to 0g (we didn't measure data during the regeneration)). He also set the value of the oil ash residue to our rough estimate of 35g.
Logs and Data:
I attached a couple of logs (split into different files by me after every change).
I can also provide around 130 Screenshots from the period.
The logs contain driving with and without regeneration.
I also have screen recordings of the last 200Km (of which 140km where regeneration) which i could provide.
Things I have noticed:
During regeneration the dpf input temperature is around 550-650c which is good, but the output temperature seems low with 350-380c?
On the highway I can reach 360c output temp with 400-480c input without active regeneration.
Without the regeneration, the values from the 2 temperatures seem to align to validate each other.
I have read all the (132) posts in the forum and everywhere the output temp is around 500-600c.
Could this be a defect lambda probe not telling the right amount of oxygen to let in, which prevents the soot from burning?
Generally huge thanks for developing the App, it is a godsend in my situation.
Hope you can help me.
Greetings
Chriss