Van would not start occasionally after DPF and EGR delete

vdiksas

New Member
Hey there, another puzzle for you guys :D

I own a VW T6 2017 2.0 TDI (150 HP), 300,000 kilometers (186K miles)

I have a weird situation. I had both EGR and DPF deleted (none of the hardware removed) on my van and after that sometimes it would not start. No crank. If I would hold the key turned, it would crank but with (what I assume) little resistance. Like low compression.

The funny thing is that when the van does not want to start (I tried multiple times) - I plug my OBD device - go into Engine LiveData and then - 100% of the time I get the car running. That have happened +100 times already. No error codes.

I imagine that would have something to do with cam or crankshaft sensors. I have the car returned to the shop where they have done the EGR and DPF work. They cleaned some kind of valve which they assumed could be the problem because it closes when the engine is shut down. Sorry I could not recall what kind of valve exactly that is.

I am wondering what could be the reason for that and if someone has experienced something like this.

Thank you for your thoughts and ideas.
 
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