I'm not sure the chip was mentioned earlier ... yes, it's always good to take that out of the situation when things go wrong. Try it without the chip.
Can anyone shed a light on what diagnostic program was being used in that video?
Tony,
I've had problems with DPF last year, went into limp mode and triggered engine light, then I reset it, drove some highway and it was good for a week or two, then again. So after few months of struggle I concluded it is a combination of possibly restricted DPF + chiptuning, so I removed DPF honeycomb and deleted DPF in ECU.
It was OK for maybe half a year, then I begun noticing more and more hesitation when I gave it some gas at low rpm...it simply did not react quickly as before, and also begins smoking. But at higher rpms it pulled brutaly.
So I am still suspicious about how DPF honeycomb was removed... on one side it was nice cut, while on another it was broke and teared. Maybe a piece or two went sideways and block exhaust flow, but as DPF is deleted in ECU, it does not trigger any code?
I guess those sensors before and after DPF do not play any role now?
That's nice list of possible reasons. Now I need to figure out the way to diagnose, as in my case delay, smoke and bad response is random - sometimes it pullsy like it should, sometimes it just smokes. I can feel it....will try to record all possible data and make some conclustions out of those.If you've removed the DPF routines from the ECU, those sensors probably won't be monitored. You could pop the DPF out and check that it's clear, that would answer the "blockage" question.
Reaction time is affected by turbocharger spooling. This could be a worn turbo shaft, a leaking EGR valve or some opening in the exhaust (EGR tube cracked, gasket worn), a turbo actuator not pulling hard enough to open the vanes (usually vac hoses, but sometimes BCS). ALL of these will cause black smoke, and delays in responsiveness.
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