tdi_car_rider
Member
Hello Guys,
First post here. I need some help with an EGR fault that I am seeing, if I keep the car at ~1900 revs, the engine workshop light comes on and an OBD scan shows it to be the P0401 insufficient EGR air flow fault. The vehicle drives fine, what is weird is sometimes it actually goes away!
Originally when I got the error, the car started limping really bad (egr stuck open?), i took it to a local reputable garage who checked it with VCDS and said it was the EGR valve + new glow plugs. He did a delete for me (I believe he just blocked the vaccumm line). I wasn't happy with the CEL appearing and felt the cars boost was being limited. I had to go into work during the week but a family member took the car to another local garage to get the EGR changed. The garage fitted a new EGR (delphi brand) and the car drives absolutely fine except for the fault appearing!
I have one of the later 1.9tdi engines with a DPF, it is a bluemotion BLS engine, 2008 model (58 plate). The EGR is different to the other 1.9tdi engines, i believe it is electric.
Going back to the problem, I have managed to repeat the problem by keeping the revs around ~1900-~2000 for a few seconds before the fault apears again, clearing it just results in it re-appearing whilst driving when the rev range is between the aforementioned.
Any thoughts and suggestions guys will be helpful. I do believe the EGR is opening and closing; When i run Torque pro and read some information through the OBD port, the emissions tests do pass but fail when the fault appears. I have even monitored the MAF and can't see any spikes or anything to indicate something wrong there.
my current thought chain at the moment is:
- during original EGR delete or the fitting of the new EGR (delphi make) one of the vaccum lines has been damaged.
- Really clogged up intake
- Faulty EGR which is not responding correctly to the demand from the EGR
- Faulty Solenoid (anyone know where this is located?)
- Fault cooler flap (again anyone know where this is located?)
- ECU requires to re-learn the EGR --> Ross Tech's website says you cannot perform this on the PD engines, but i I beleive you can on the later model as the EGR is electric.
Since this is the later engine, the EGR system is slightly different and finding any information on this partciular model is a nightmare, everything refers to the other engine models.
I don't want to return the maybe fault EGR just to have my warranty claim rejected with them claiming that it is working fine. Also, I want to keep the car straight and want to avoid any software re-maps etc to delete the EGR+DPF (I wouldn't mind the extra BHP though!).
Any help guys? An EGR diagram for this engine would be particularly useful Also the 'normal' reading from the MAF at idle and the reading it expects during light load would also be helpful. From my research, the EGR recirculates 15% of gases under light acceleration, does anyone know the actual rev range the EGR should operate?
First post here. I need some help with an EGR fault that I am seeing, if I keep the car at ~1900 revs, the engine workshop light comes on and an OBD scan shows it to be the P0401 insufficient EGR air flow fault. The vehicle drives fine, what is weird is sometimes it actually goes away!
Originally when I got the error, the car started limping really bad (egr stuck open?), i took it to a local reputable garage who checked it with VCDS and said it was the EGR valve + new glow plugs. He did a delete for me (I believe he just blocked the vaccumm line). I wasn't happy with the CEL appearing and felt the cars boost was being limited. I had to go into work during the week but a family member took the car to another local garage to get the EGR changed. The garage fitted a new EGR (delphi brand) and the car drives absolutely fine except for the fault appearing!
I have one of the later 1.9tdi engines with a DPF, it is a bluemotion BLS engine, 2008 model (58 plate). The EGR is different to the other 1.9tdi engines, i believe it is electric.
Going back to the problem, I have managed to repeat the problem by keeping the revs around ~1900-~2000 for a few seconds before the fault apears again, clearing it just results in it re-appearing whilst driving when the rev range is between the aforementioned.
Any thoughts and suggestions guys will be helpful. I do believe the EGR is opening and closing; When i run Torque pro and read some information through the OBD port, the emissions tests do pass but fail when the fault appears. I have even monitored the MAF and can't see any spikes or anything to indicate something wrong there.
my current thought chain at the moment is:
- during original EGR delete or the fitting of the new EGR (delphi make) one of the vaccum lines has been damaged.
- Really clogged up intake
- Faulty EGR which is not responding correctly to the demand from the EGR
- Faulty Solenoid (anyone know where this is located?)
- Fault cooler flap (again anyone know where this is located?)
- ECU requires to re-learn the EGR --> Ross Tech's website says you cannot perform this on the PD engines, but i I beleive you can on the later model as the EGR is electric.
Since this is the later engine, the EGR system is slightly different and finding any information on this partciular model is a nightmare, everything refers to the other engine models.
I don't want to return the maybe fault EGR just to have my warranty claim rejected with them claiming that it is working fine. Also, I want to keep the car straight and want to avoid any software re-maps etc to delete the EGR+DPF (I wouldn't mind the extra BHP though!).
Any help guys? An EGR diagram for this engine would be particularly useful Also the 'normal' reading from the MAF at idle and the reading it expects during light load would also be helpful. From my research, the EGR recirculates 15% of gases under light acceleration, does anyone know the actual rev range the EGR should operate?
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