The Amal Valve on my cosworth is making a metallic type rattleing noise when I hold the revs at a certain level, does this mean that it is shaged and what tell tail symptoms would I notice ie: boost problems etc.

Also I've noticed lately that there is oil residue comeing from the turbo and through the intercooler and into the plenum chamber, and the plugs seem a little on the black side, could the Amal Valve cause any of this or am I looking at differant problems here.

Any advice, or if you have had similar prob's please let me know.

CHEERS!