Hi all,
I've had some smoke issues with my mk7 transit. Originally advised it was EGR so got that changed, but didn't fix it. I don't want to spend any more money replacing things that aren't the cause so want to be certain what i'm replacing will fix the issue. I bought a cheap ELM adapter and got forscan runnning in a virtual machine on my laptop which let me do the learns - but that didn't seem to affect the issue.
I emailed vantuner who suggested a new PRV / SCV and software update after getting my injectors professionally tested to see if they're at fault. I'm wondering if there's any self diagnostics i can do to confirm whether the PRV / SCV is at fault to avoid me having to test my injectors as doing that is quite expensive.
I loaded up forscan and after reading a few forum posts on here did the 2nd gear acceleration test with the graphs running - roll along in 2nd gear at idle, when speed settled - floor the accelerator. I only went up to about 30mph as its a residential area but can repeat the test if i need to get to the rev limiter.
Anyway i've got these graphs that i only half understand, but don't understand the consequences of the numbers if that makes sense.
2gearfullthrottle1.png
Looks to me like the fuel rail pressure peaks at 180,000 kPa (1800 bar / 26,000 psi) and doesn't follow the desired pressure. Before flooring it, it was + 25,000kPa compared to desired. Mid test it was 35,000 kPa below desired and just before lifting off it was 10,000kPa above desired. Does this support the PRV / SCV replacement or could this still be injectors?
Another thing i noticed is the mass air flow is only 1/3rd of what is demanded. Which could be an issue if its over fuelling and not getting enough air. Turbo issue? I did check for any splits in the hoses but couldn't find anything...
All help much appreciated
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