I have an issue with my van, Its the 2.0 16v DI engine, In other cars, Zafira, Vectra etc its called the DTI.

I took it for some work to be done, The garage noticed it was picking up an EGR valve fault, (Currently has very intermittent engine management light coming on)

They advised me to check the vac hoses, Which I did ad seem ok, Next advise was check / clean EGR valve, Did that and still the ligh comes on,

I was told to check the EGR valve for vacuum, I took it off and pushed the shaft piston up, hold the nipple and it drops, but holds SOME vacuum,

My question is - How much am I looking for? Is it supposed to be like a good Recirc valve, By where it barely drops??

Any DERV experts here??? Any other checks?? I dont want to buy a new one if its not the cause...

Chrissy