Hello guys,
I have in my workshop one passat B6 with CBAB engine. The client came in the workshop because the engine while driving starts shuddering on half or full load intermittent and in some momments even cuts off.
Repair taking cared before he got to me: tank feed pump changed, high pressure, and high pressure feed pump also changed. Fuel rail regulator changed, also fuel filter changed, pipes and fuel tank drained and cleaned.
When he got to me I made him a quick drive test and suposed that injectors are failling so I have sent them to a proffesional workshop for further investigation on the test bench. They turned out all 4 to be out of specs specialy on the full load fuel debit side, realy out of range. I give it a go, ordered new ones from Bosch, replaced them, coded them and surprise, car behaves the same! No signifiant change. Also to mention the car has 615k km so it was clear that injectors could not have gone so many miles without breaking.
I also have noticed that when the engine cuts off after shuddering strong, the batt sign and check engine does not litt but just after pushing the clutch and the rpm drops to 0. It starts right away without no problem and keeps going till it shudders again and stals.
No fault codes stored before, during and after.
I can post an autoscan but there are no related faults stored in regards to this issue. Not even lost comunication erros for the engine ecu that can take you to a power interruption.
Could be a failing ecu or voltage regulators from the ecu that controls the injectors? This version has piezo injectors, a realy pain in the ass. Could be a loose conection somewhere that only makes intermittent interruption when on half/full load throtle?
Any input is highly apreciated as i have run out of options.
I have in my workshop one passat B6 with CBAB engine. The client came in the workshop because the engine while driving starts shuddering on half or full load intermittent and in some momments even cuts off.
Repair taking cared before he got to me: tank feed pump changed, high pressure, and high pressure feed pump also changed. Fuel rail regulator changed, also fuel filter changed, pipes and fuel tank drained and cleaned.
When he got to me I made him a quick drive test and suposed that injectors are failling so I have sent them to a proffesional workshop for further investigation on the test bench. They turned out all 4 to be out of specs specialy on the full load fuel debit side, realy out of range. I give it a go, ordered new ones from Bosch, replaced them, coded them and surprise, car behaves the same! No signifiant change. Also to mention the car has 615k km so it was clear that injectors could not have gone so many miles without breaking.
I also have noticed that when the engine cuts off after shuddering strong, the batt sign and check engine does not litt but just after pushing the clutch and the rpm drops to 0. It starts right away without no problem and keeps going till it shudders again and stals.
No fault codes stored before, during and after.
I can post an autoscan but there are no related faults stored in regards to this issue. Not even lost comunication erros for the engine ecu that can take you to a power interruption.
Could be a failing ecu or voltage regulators from the ecu that controls the injectors? This version has piezo injectors, a realy pain in the ass. Could be a loose conection somewhere that only makes intermittent interruption when on half/full load throtle?
Any input is highly apreciated as i have run out of options.