1.9 tdi engine turning off while driving

[ucme]

My dad complained his tri was running little rough so I purchased a can of liqui moli diesel fuel treatement. We added it to the tank and after 10 minutes on idle we went for a drive.

After first corner at 50 kmh the engine shut off. Took 5 minutes to restart. Went onto freeway to run it through as per instructions. Car switched off after 1km. Again took 5 minutes and so on. So now this is happening at random every drive since we put it in yesterday.

What can be causing this? Fuel pump is fine as fuel doesn't cut out.when it fails to start there is fuel pressure. What are some other things I should e looking at

Oh and there's no codes.

Any help is much appreciated

[Tom87]

fuel filter water trap?

same symptom as a mate's diesel, corners and bumps would cause a bit of water to get out of the trap and into the fuel pump (causing it to intermittently die).

as the water trap sensor was malfunctioning (jammed by gunk) there was no warning light or code being generated.

Although apparently the mk5 TDI might have an integrated water trap/fuel filter which means the whole filter needs to be changed (not a bad idea if it has had water go through it).

[ucme]

Replaced filter and all seems fine. Thanks for the help

[ucme]

Ok gotta resurrect this. Issue never went away. Was fine for a few days then again. I've replaced fuel filter and fuel pump and same thing. Car turns while driving, while stopped ...... And it takes ages to start back up. Any ideas?

[SIMO2X]

Id try dropping the fuel and putting fresh diesel into it after replacing the filter and pump.

[Flea]

maf sensor??

[CATELUS]

I had a close friend of mine have a similar problem but with his Scirocco R.
Found out that one of the ECU's for the fuel management system was not functioning 100% & had it replaced under warranty.

[ucme]

Volkwagen says the only issue the can find is that the glow plugs for cylinder 1,2 and 3 show a open circuit. Same thing that vagcom brings up after a period of driving.

I replaced the injectors and wiring from a spare head that i knew worked perfectly and now the engine wont start at all....

its a very simple procedure to replace them but im wondering if i have done something wrong or if this is just bad timing. anyone got any info on this?

much appreciated

[vdubtech]

After replacing the PD injectors it takes about 10 cranks woth a good battery to start the engine....if you have no fault codes after replacing the injectors keep cranking....if you have any codes now come up they may be related to the injectors as the loom usually breaks up on removal as its sat in the oil...also seen people not fit the loom connector correctly on side of the head..gives a fault code for all injectors open circuit.....VDUB..

[ucme]

no fault codes. crank till STOP appears. check for codes and retry. wont start