Looking for some guidance

So, in summary, the Jakes still work with the OEM setup, but not with your modification installed?
Has he tried it both ways since the issue started? If not he needs to.
As far as why it happened, it is almost impossible to say without knowing exactly what you did.
If you copied another design to the T, then you could call that designer and ask them (but be prepared for a piece of someones mind).
If the Jakes are coming on, but in position II instead of position III, then that may be able to be diagnosed with the DDEC software.

Martin

 

So, just to refresh my memory, it has the VVG turbo on it?
EGR and DPF, or just EGR?
Martin

 

I have not delved too far into the new rig yet (09 S60 engine) as it is still under warranty and only has 11,000 miles on it!
I would guess that the modification is stumping the VVG turbo though, and having knock on effects from there.

Martin

 

Your "slug" is messing with the computer probably making it think it's always running above 6500 feet. I tried the same gimmick. You replace the baro sensor basically with a 10Kohm resistor or some other thing to make it think that.

When you do that, the ECM won't see a true change in pressures and sets your fuel and timing curves at a set point. Almost like it would "de-rate" it.

It's as if you are constantly running at high altitude really.

Get rid of the slug.

Make sure ALL other things are fixed mechanically on your engine as well.
http://www.thetruckersreport.com/tr...2292-battle-mileage-2007-century-14l-egr.html

Then fire that ECM off to Rebel 127 and let him work his magic.

 

Ahh,so that is what a "slug" is.
On my last rig, when I got to Wy, it would lose boost and engine braking due to the altitude of the state. Sounds like you tricked it into thinking it was at higher elevation, thus it derated the turbo/jakes.

Martin