VW T6 (2018 cxha) - mystery engine jerks and judders av 2-3k rpm problems

[St6]

Not the right airflow can cause wrong fuel mixture

 

[mr.change84]

Perhaps you could make another log with a different logging setup below - as described in post #18

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Will do the logging today.
I'll tag you when done

 

[mr.change84]

Not the right airflow can cause wrong fuel mixture

Looked down and into the inlet manifold yesterday, and it wasn't too bad.. no gunky at all..
Don't feel it's airflow restricted

 

[mr.change84]

@mmi
requested log.
after looking at live data, we noticed IDE09330 are higher then the others. cyl.1-3 have "same" value, but cyl.4 runs higher number..

we suspect bad injector on cyl.4.. and we will do an return flow test on all 4 injectors..

 

[mr.change84]

@mmi
We found the problem..
Injector 4 is leaking out retur internally.
We just did a return flow test, and nr 4 is overflowing..

 

[mr.change84]

New injector is on it's way and will be swapped on Tuesday.

Will report back if this fixed our problem

 

[mr.change84]

# problem solved #

@mmi and everybody else, thank you so much for all you help..

I love this forum, with all it's information and possible help when needed..

In the end, it was the 4. injector.
Swapped it out and now it's running .

 

[Bert69]

I don't understand this bit. I assume that you weren't allowed to try and start it when you looked at it?

I'm not trying to cast a shadow over your purchase but I do wonder if the belt snapped and bent the engine. Another belt could have been put on and purposely split to try and pass it off as a close call.
It would be beyond immoral but, sadly nothing would surprise me from some dealers.

 

[mr.change84]

@Bert69 ?

 

[Bert69]

@Bert69 ?

@mr.change84 Sorry about that post, it was finger trouble