Low fuel pressure during engine start up w204 c220cdi
04-07-2024, 06:27 PM
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C220cdi w204 om646
Low fuel pressure during engine start up w204 c220cdi
Hello
please I have 2008 c220cdi w204 om646 and my headache is this juddering/stutter every morning when cold started for the first time. Engine starts alright but will immediately judder for about 10 minutes then settles and runs alright throughout the day. New injectors, new qcv, new glow plugs and relay module yet no changes. I will appreciate if anyone has had this issue and how it was resolved before I throw any more money on it. Scan showed 221b low fuel pressure during engine start up. Thank you
please I have 2008 c220cdi w204 om646 and my headache is this juddering/stutter every morning when cold started for the first time. Engine starts alright but will immediately judder for about 10 minutes then settles and runs alright throughout the day. New injectors, new qcv, new glow plugs and relay module yet no changes. I will appreciate if anyone has had this issue and how it was resolved before I throw any more money on it. Scan showed 221b low fuel pressure during engine start up. Thank you
05-13-2024, 03:25 AM
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C220cdi w204 om646
Problem solved
[QUOTE=Eoy;8952032]Hello
please I have 2008 c220cdi w204 om646 and my headache is this juddering/stutter every morning when cold started for the first time. The engine starts alright but will immediately judder for about 10 minutes then settles and runs alright throughout the day. New injectors, new CVs, new glow plugs and relay module yet no changes. I would appreciate it if anyone has had this issue and how it was resolved before I throw any more money into it. The scan showed 221b low fuel pressure.
I did a bit of changing to try and solve this problem and almost changed the whole common rail and or the HPFP, but I decided to change the PCV at the far end of the common rail since I had already changed the rail sensor but did not solve it. Since changing the pressure control valve, the car starts straight up with no juddering/stutter like before. And I feel much smoother. So yes the problem was with the PCV, in my case the PCV on the rail had a part number for engine 651, I don't know how, but I think the previous owner might have replaced the common rail with a 651 engine type. I managed to get a new one for A646, they were very different and the old one had a rust at the tip inside and was very easy to change in just about 10 minutes the car started straight away and since then I have not had this problem again. Thank you all for your inputs
please I have 2008 c220cdi w204 om646 and my headache is this juddering/stutter every morning when cold started for the first time. The engine starts alright but will immediately judder for about 10 minutes then settles and runs alright throughout the day. New injectors, new CVs, new glow plugs and relay module yet no changes. I would appreciate it if anyone has had this issue and how it was resolved before I throw any more money into it. The scan showed 221b low fuel pressure.
I did a bit of changing to try and solve this problem and almost changed the whole common rail and or the HPFP, but I decided to change the PCV at the far end of the common rail since I had already changed the rail sensor but did not solve it. Since changing the pressure control valve, the car starts straight up with no juddering/stutter like before. And I feel much smoother. So yes the problem was with the PCV, in my case the PCV on the rail had a part number for engine 651, I don't know how, but I think the previous owner might have replaced the common rail with a 651 engine type. I managed to get a new one for A646, they were very different and the old one had a rust at the tip inside and was very easy to change in just about 10 minutes the car started straight away and since then I have not had this problem again. Thank you all for your inputs
