An engine’s exhaust manifold (or manifolds) is an integral part of the exhaust system. The manifold is bolted to the engine’s head and is the first component that spent exhaust gasses are routed through on their way out of the exhaust system. Unfortunately, manifolds often develop stress cracks from the extreme heat that they are subjected to. As the porous metal that most manifolds are made of expands and contracts with temperature changes, cracks can occur. Below are the symptoms of a cracked exhaust manifold.
One symptom of a cracked manifold will be a visible crack that you can see on the manifold’s surface. To look for a crack, look closely at the manifold, particularly where it bolts up to the motor and where the most heat will be.