Just returned from a Volvo dealership here in Sweden and it felt like I was teaching them how their cars operate and are built, embarrasing
Hopefully you guys can help me with some advice.
My problem is a leaking actuator for the EGR Cooler Bypass Valve, it is leaking vacuum. The car is a Volvo V70 D5 2006 185hp.
I just discovered this after checking my engine mounts for leakage, the car works fine and no codes are shown.
As I have come to understand, the valve bypasses the cooler when the engine is cold so that the exhaust warms it up faster and then returns to cooling so that the gas volume can increase thus reducing NOx emission.
As I mentioned it is vacuum operated through a solenoid valve and have a spring on the other end when the vaccum supply is cut off.
The actuator is leaking so much (internal membrane probably) that I was not able to move it at all by hand pumping vacuum through the hose connected to it, but it did move when I pushed the rod by handforce.
Volvo will/cant replace the actuator alone but want a complete EGR cooler replacement which will cost me approx. 650gbp!
My questions are:
1. How does the solenoid operate, through engine temp. or exhaust temp?
2. Now that the hose is plugged is the bypass valve stuck so that I have constant exhaust cooling or is it bypassing the cooler alltogether?
3. If I ignore to fix this will it hurt the engine and how?
4. Are there any solutions that don't cost a fortune?
I greatly appreciate any answers as I have come to trust you guys more then any Volvo mechanic so far, and appologies for torturing you with bad english.
/Alex