Tdci anti shudder valve/ solenoids

nd

Hi, I'm trying to figure out the vacuum lines in my 2005 2.0 volvo s40. it has the same engine as the ford tdci and Peugeot hdi and Citreon ect.

On the front of the intake manifold it splits into two intakes with vacuum controlled flaps. I know at least one of the solenoid valves to the left of the intake controls the vacuum to those. Does anyone know are they both controlled by the one solenoid are do they have a solenoid each? If they are controlled by the one what does the second solenoid valve contol?

Disconnecting each in turn gave these diagnostic codes

2141 air inlet regulator valve
0033 bypass valve boost air cooler

Thanks for any help.

rex-x

They will both be separately controlled although usually electrically not by vacuum on that engine? If vacuum they will have their own solenoids.
One is a bypass for the intercooler and the other is an air doser that closes off the fresh air intake to force more egr flow into the engine in certain conditions

nd

That's brilliant information, thanks a million.

Nope vacuum controlled on my one anyway.

There is a vacuum reservoir underneath the intake. You don't happen to know does the vacuum line go directly from the vacuum pump(off the brake booster hose) to this, and the vacuum reservoir then feeds the 3 solenoids(there is a 3rd one that goes to the turbo wastegate actuator)?

rex-x

That is likely the exact setup, 1 solenoid for vnt control, 1 for air doser, 1 for IC bypass.

What problem are you having exactly?

nd

Thanks again. Mainly surging and it won't run below about 1500 revs.I thought it might be something to do with those vac pipes, but don't think it is now.

The fuel rail pressure is very unstable. I tried a different high pressure pump fuel volume regulator but it made no difference

I took a short video of some live data, you can hear the surging in the background and see the rail pressure changing dramatically. When it was running well it was fairly stable at about 250.

Reading this though

"Your van will need a software update and a process called pcm recalibration , pump learn and fuel pressure relief valve counter reset ."

I'm thinking after that the pump fuel volume regulator is changed it probably needs to be calibrated and that it's likely only volvo can do this

nd

After further reading I think it's unlikely that it needs to be calibrated.

If i unplug the fuel rail pressure sensor the surging stops but it sounds horrible at idle( have a second rail pressure sensor and it does that same thing).

Injectors probably? I did a leak off test and they are all leaking off about the same.