A tapping or whistling sound during cold starts on your GMC Sierra 1500 can signal a cracked seal caused by broken exhaust manifold bolts. Heat cycles, towing, and salted roads often weaken those bolts, letting exhaust escape and creating that sharp noise—or even a faint exhaust smell. Haynes shows you how to remove the exhaust manifolds, replace the gaskets, and take care of the manifold bolts while you're in there. The latest print manual also includes full digital access for easy reference an
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