February 24, at am Viewing 7 replies - 1 through 7 of 7 total. Grayfox Participant. February 25, at am TheArete Participant. With the vehicle running, open the engine cover and listen near the exhaust manifolds to see if there is any unusual noise. Manifold cracks can also cause excessive exhaust odors since a portion of the exhaust gasses are evacuating out of the crack instead of out the end of the tail pipe. The exhaust smell may or not be noticeable from the interior of the vehicle but will be more noticeable in the engine bay and the areas around the manifold.
A crack is, in essence, a vacuum leak and may prevent all of the engine functions from operating correctly. It's no secret that exhaust gases are hot, and when those hot gases leak through a cracked manifold, they can melt wires or even ignite parts made of combustible materials.
If you live in a state or city that requires emissions testing, a cracked exhaust manifold may cause your car to fail. When this light is activated, your car will automatically fail. Unfortunately, there's no quick-fix for a cracked exhaust manifold.
Some drivers have attempted to use heat-resistant epoxy, such as JB Weld. While JB Weld is an amazing product with hundreds of uses, it simply can't withstand the 1,degree exhaust gases. That means this engine has four cylinders, and each of those pipes will combine into one. That whole piece is the exhaust manifold, which essentially allows the engine to breathe. Manifolds can crack over time due to the stress from constant, extreme temperature changes.
It might also result in funny smells around the engine bay, and you may experience a loss of pressure in acceleration and performance.
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