Petrol 4.2 part number needed

[Mr_V]

Originally Posted by mannyo

You should be able to easily move the part at the other end of the bellows by hand against the spring pressure, if it does not move or is stiff then the intake manifold needs to be overhauled to get them working again. If you replace the plastic part without a correctly working part then it will just break again.

Thanks for that. I should have known it was a common problem.

They move albeit a bit stiff - I just thought it was the springs that were strong. On the Vauxhall v6 they open during a specific rev range to improve torque and iron out flat spots.

I wonder if my fuel economy would improve if these are working as designed? At the moment I am getting about 19-20 (17ish on LPG)