Check out the Volvo owners section, there are a couple of guys looking for a number of fixes. When you say you have your egr pipes blocked.
Does that mean you actually removed the egr valves and blocked the ports there, or did you block the crossover pipe.
I ask this because i blocked the crossover ONLY on my truck, we have the same engine and truck, and I have only 1 pipe....the crossover pipe.
I too have a valve #1 giving a code, I don't see any DE-rate that I notice.
In the Volvo owners group read the latest in the last week, I'm waiting for a guy to get back with us about trying the diode fix.
The diode fix sounds great, but from what I understand is that the barometric pressure switch on these Volvo's is located on the computer ECM, so I'm waiting for someone to tells us the wires you need to put the diode fix on. I'm not sure if you can do it at the EGR valve(s) wiring harness or not.
On the detriots it is there on the intake on the drivers side.
I understand there is a guy who is looking into getting an ECM from a truck that is the same but the ECM does not have the EGR bull on it. So if this works (and I'm not saying it will) we can maybe kiss the bad settings goodbye. this might be a 500.00 fix from what I'm hearing so far.