I've been tracing a whistle in my 325i, I changed the intake manifold gaskets, breather pipe seals and tb gaskets but it's still there. It sounds like it's coming from top of the throttle body, where the shaft goes through. It looks a real pig of a job to remove all the springs and bits. I'm guessing there's some kind of seal under there?
There's a guy on eBay who bores tb's out to 64mm, was thinking of asking him if he could sort it while doing the mod. Anyone used this service? Thanks.
