ISX CM871 Turbo Sceech/Squeal

[marek4792]

Usually exhaust manifold/turbo gaskets, but could be loose hardware if work was done recently. If the slip joints are in a bind especially when hot could momentarily cause a brief squeal that goes away after awhile.. Or the manifold itself could be warped if original high mileage or a cheap aftermarket.. Just my opinion dealing with my old 870 that had the exact symptom..