Blauqualmvideo nach Kaltstart: 1,9 PD-TDI | Posts 16+

OK, then we apparently need to delve into the microcosm of diesel and Möltrop particles, along with their combustion process, under varying surrounding temperatures .

This leads me to the question of whether the blue smoke in the video might also be caused by poorly atomized diesel fuel (due to PDE defects) or a lack of glow plug heat.
Or is blue smoke always caused by oil?

Quote:

Once the motor no longer cools the compressed air to an extreme degree, the motor can also cleanly burn off that small amount of oil.

What I still find interesting is the new blue smoke that appears during the short bursts of gas in the video, even though the exhaust already seemed verschandeln beforehand.
I spontaneously assumed that the briefly revving turbocharger would release some new oil, which would then be (badly) combusted.
But why, according to the owner, does the blue smoke disappear when the engine is warmer? Could the loader still be leaking oil, which might burn off visually unnoticed in a warmer environment?
Are there any other possible oil leak sources in the 1.9 PD TDI engine that could cause leaks when the engine is warm?

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ulf wrote:

This leads me to the question of whether the blue smoke in the video might also be caused by poorly atomized diesel fuel (due to PDE defects) or a lack of glow plug heat.

Yes!

Quote:

Or is blue smoke always caused by oil?

No...

As long as all the glow plugs haven't been checked, I strongly believe that they are the cause of the problem. When there's a surge of gas, it also randomly introduces more diesel. If the glow plugs or their relays are completely defective, it looks like this - in my opinion. At -10°C, for example, an Ibiza SDI a street away smokes like crazy.

The rather large direct injection systems (PDE) in the Cupra, of course, are not world champions in terms of injection pressure at idle. The atomization is quite poor, and without any afterglow, it likely continues to burn "unevenly."


Hi FabiaCombiTDI,

FabiaCombiTDI wrote:

During a sudden acceleration, a certain amount of diesel fuel is also injected, quite randomly.

This lasts for approximately 1 second, during which the engine is supposed to rev up. The subsequent blue smoke lasts for what feels like 10 times longer .

Quote:

. The rather large

PDEs (pressure drop valves) from the Cupra, of course, are not world champions in terms of injection pressure at idle. The entire BPX injection hardware is identical to the ASZ, the PDEs are "only" 550s.