My car recently developed a lot of issues that I've been working through. It needed a new EGR valve and fuel pump. But I held back on replacing the EGR because I hear a vacuum leak and I guessed there wasn't a strong enough vacuum for the EGR to work properly. Plus it recently started whistling when I accelerate!
I thought for sure the upper/lower intake must have a blown gasket (I've ham-fisted both of those b4). So I take apart, clean (didn't work), replace gaskets (didn't work), and then today a super miticulous job putting them on very carefully and according to torque specs (I listed torque specs in this post). I also held a straight edge up to the mating surfaces and they were all perfect except one of the heads (actually I didn't measure the other one) dipped down by like ...1/10mm in the center but I would think the gasket would make up for that.
Now I'm wrong a lot but I think I did the job right and I think the parts should be good. Yet I still hear the damn whistle!
I notice there is a line that connects the bottom of the upper intake to the some part by the brake booster (PA66-GF33 ). It's totally collapsed and I believe I can hear it suck air when I rev the throttle body. I just can't put enough load on the engine to tell if that's where the whistle is coming from because it only whistles while driving (cant reach it to spray carb cleaner in there).
I was imagining one of the gaskets flapping by the way it whistles but now I think it's the vacuum line.
You think that line might be it? Thanks for the help!!