A few weeks ago my car developed a fizzing when started from cold, which stops after a couple of minutes. I took her into a local garage which tightened up the two end bolts on the exhaust manifold.
This cured the problem for a few weeks and now it's back again. My question is should I tighten up all of them? If so how tight? Anything I could do to prevent this in the future?
BTW, to my knowledge the turbo has never been changed...