Audi A3, 2L TDI 16v BKD engine start problem

[labanauskas]

Hi, everyone,

I'm facing problem with cold engine start, when cranking it feels like like not all not enough or too much fuel and and cylinders misfire or smth...
Turning off and then starting again is way better.

The problem appears after a car stood still for over the night or couple of hours. Sometimes it starts without a problem 1/2 crank hot/cold...

Here's a video:
Dropbox - VID_20150224_074954.mp4

Injectors at idle stabilization:
Dropbox - jgkwghjwgh.PNG

Glow plugs are new, oil and filters(fuel, oil) changed 5000km ago.

No fault codes

Fuel temp, engine temp sensors show correct temperatures. Crankshaft and camshaft are good.

Torsion value 0.0/0.5 .

So what can cause such a problem? Tandem pump? Air leakage? Leaking injectors?

[dragan75]

If smel disel may be gasket on tandem pump may be senzor
of flow air protocomer translate this word


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[labanauskas]

All temp sensors show correct temperatures... No noticeable diesel smell when starting the engine.

[Crasher]

When you changed the fuel filter, what colour was the fuel?

[labanauskas]

Quite dark, but I read that it's normal for PD engine. Filter was changed about 8000km ago. Maybe it's related to ecu engine start map?.. Friend has audi a4 '07 with 16v pd BRE and 180k km on clock - no starting problems...

[Crasher]

When the fuel in the fuel filter is black it means the tandem pump is leaking engine oil into the fuel and the fuel in the tank will be heavily contaminated with dirty engine oil. The fuel in the filter pot should be as for clean diesel with just some light debris in the bottom. This problem is a common cause of poor idling on the BKD engine.

[labanauskas]

It's tandems' pump gasket or itself?

But the idling is OK, only random start when engine cold/warm ...