Skoda Octavia 1.9TDI Cutting Out Problem

[rithuan]

My brother who lives in mid Spain has a 2008 Skoda Octavia 1.9TDI, after a medium to long run of around 40 to 100 miles (summer or winter) and as he relaxes his foot off the accelerator the car will cut out, at first he said it happened after each service (fuel filter/housing ???) and then cured itself, but now it happens quite frequently. There is no evidence of exhaust smoke, there are no registered fault codes, it does not go into Limp Home mode, there is no evidence of fuel tank vacuum, the fuel pump is working continually, it never appears to misfire or run on 3 or less cylinders, there is no evidence of over heating. I am not sure if it has a DPF system, but with the motorway driving he does it should be clear anyway.The car generally takes around an hour before it will restart, but not every time.

Has anyone any experienced anything like this or have any idea what could cause this problem. There are no known outstanding recalls on this car, but manufacturers do not always tell the public about non safety related issues.

I would be grateful for any help and support.

Best regards

Ian McKay

[TooLateForAName]

Has he got vcds or similar?

I'd be looking at the live feed of the fuel pressure. While running and then after it stops when trying to restart.

[rithuan]

Many thanks for your input

[xjay1337]

Check fuel filter and tandem pump.

[rithuan]

Many thanks for your suggestion, I do not know about tandom pumps, this sounds interesting, I will check this out, thank you

[rithuan]

I am guessing the pump/s are working as it can heard via the fuel filler apperture

[TooLateForAName]

rithuan said:

I am guessing the pump/s are working as it can heard via the fuel filler apperture

They can be running but not providing enough pressure. It is a fairly common issue.

Do you know if the car has ever been misfueled?

[rithuan]

I do not if the car has ever had the wrong fuel put in it but I don't think so, my brother has it for 2 + years now and it has got progressively worse. He comes back to the UK every winter and has it serviced.