OldCarpenter

I would not calling it running rough but making a strong shake. Stopping after it does once or twice would not make a difference since it will not repeat it again, I am thinking. While the problems are happening, I do not have any problems in changing the gears. Sorry I forgot to say: This is a manual 6 gear version. By the way: Thank you so much for you have taken your time to write back and follow my topic.

The software registered this error and used exactly "sporadic" expression, then I said let's change it and see it, if it helps. It did not help. A car-electric specialist looked at it, and he said there is nothing wrong. A diesel specialist found 1 faulty injector and he replaced it. My all-round mechanic still puzzled. I agree that it costs a lot without a full diagnostic, but the software is not showing anything. There is no black smoke or anyhting in that direction. The car uses very little oil for its mileage. I had to add appx. ½ a liter oil last weekend, 8,000 km after the engine oil change.

Yes. Only once it did that after 20-25 minutes drive, but in all other cases it was within the først 5-12 minutes. I twice tried to pull aside and waited for it will happen, while the engine running idle. It came, and then, I continued driving with no problem on the country roads and the highway. And it still does up to 140 km/h with no problem.

Skoda Octavia Mk 3 2.0 TDI 150, 2016, Mileage: 270 K km. My Skoda has been making some strange shakings since February. Around the time the engine heat hits 90 degrees, which is normal running temperature, the car shakes harshly, sometimes smoothly, sometimes just once, sometimes 2 or 3, or more, with irregular laps in the following 1 or 2 minutes. During these shakes, the rpm responds and it goes up and down, as I try to speed up to compensate it. After this, the car runs smoothly despite its mileage. I can come up to 140km/h but usually stay around 120-125 in the highway. No problem at all. I have never received any error message on the dashboard. The problem occurs in every ride, but not if the engine heat is already at 90 C. During the last 4 months I have tried a lot, and changed a few parts. Lastly water pump, because “sporadic” water pump problems was registered (no dashboard error message shown at any time.) During the last 3 months: Lambda probe (lambda sensor) is changed. Fuel injectors are changed. Pressure regulator is changed. Electric system has been checked (with no errors). I did a diesel system cleaning treatment in March, with Syprin and changed the fuel filter there after. Since the problem occurs when the heat achieves a certain level, (never below 80, anyway) I expect this to be a clue. I will truly appreciate if you share your experiences and/or recommendations, would you have any of this kind. Thank you in advance. NOTE 1. Another type of shaking (sometime after it is warmed up) is happening when I hold at the traffic light, both the clutch and brake pedals are down. In this situation the shakes are quite different but continues until I release the brake pedal little, may be a few centimeters or three. I do not know if these shakes could be related to the no. 1 problem, described above – because the second type of shakes started recently. NOTE 2. 2 days before the problems occurred for the first time, I drew into a soft snow drive, appx. 30-40 cm. deep, and could drive back after half an hour’s struggle. The car was parked outside in the snow storm during the following 2½ day. I do not know if this has anything to do with the problem, but this is part of the story.

Good morning. I just drove 70 km here in the morning, more than 50 km being in highway, and I went up to 130's. Nothing :-)) So, this was a one time burning off the clogs/residues. I am relieved. Have a wonderful weekend. God bless you @Skodaudi

I am getting wiser. Thank you Skodaudi :-)) The engine cleaner is just a spray for engine compartment cleaning/washing externally - not a liquid that goes into the engine itself. Your description of DPF cleaners made 100% sense. I think I can get rid of the problem if I empty the fuel tank if the problem persists. The DPF cleaner I used is just a privat label (and cheap) but I could get this information, for the sake of curiousity: (translated via deepl.com) SECTION 3: Composition/Information on ingredients 3.1/3.2. Substances/mixtures NAME: Distillates (petroleum), hydrotreated light IDENTIFICATION NOS: CAS No: 64742-47-8 EC No: 926-141-6 REACH No: 01-2119484819-18-0001 CONTENT: 60-100% CLP CLASSIFICATION: Asp. Tox. 1 H304 NAME: 2-ethylhexyl nitrate IDENTIFICATION NUMBERS: CAS No: 27247-96-7 EC No: 248-363-6 CONTENT: 5-10% CLP CLASSIFICATION: Acute Tox. 4, Aquatic Chronic 2 H302, H312, H332, H411, EUH044, EUH066 NAME: Distillates (petroleum), hydrotreated light Best regards from Copenhagen. I am grateful for you have devoted your time.

Thank you very much @Skodaudi :-)) I remember now, after reading your reply, that I used a DPF cleaner, (0,3 liter, filled in to the tank same day as I used engine cleaner, last Sunday. I did so because I bought this car recently, second hand, I though it will improve the combustion/exhaust processes. In the label of the DPF cleaner, it says: "Specially developed for cleaning and regenerating particle filters and preventing filter blockage." Could that be something related to this, I wonder.

Hi everyone. I was wondering what this component is called in the engine compartment and right behind the engine cover. Can anyone help me, please? The funny story: I used engine cleaner spray, however, I did not rinse it at all. It was last saturday. Next day I drove 130 km, mostly on the highway. No problem at all. (I do not drive every day.) Today I used the car in the city center appx. 8-10 km, mostly slow driving, less than 50 km/hr. This component started to smoke, and I parked the car in the nearest possible place. Waited 10-15 minutes. The smoke disapeared. I started the engine again, in idle gear, ran the engine 15 minutes. Nothing came. 2 hrs later, I drove the care back. Still no smoke. But I got the same smell. I looked at workshop manuals, but could not find the exact component, so I could get an idea about what has been going on. Regards...