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Superbob
Superbob, Senior Master auto technician
Category: Car
Satisfied Customers: 2609
Experience:  Ford Lincoln, Mercury, Seinor Master, diesel certified, mazda certified, ASE Master
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Dodge: what makes the exhaust pop and crackle

Customer Question

what makes the exhaust pop and crackle on a dodge or any truck for that matter?
Submitted: 5 years ago.
Category: Car
Expert:  Superbob replied 5 years ago.

For the most part the crackle noise that you hear is caused by the expansion and contraction of dissimilar metals or different mass of metals heating and or cooling! When you turn your truck off, the metal of the exhaust manifold will cool much faster than that of the cylinder head, the contact point of each bolts that retain the exhaust manifold to the cylinder head will allow an ever so slight amount of movement at each bolt, the same thing happens when it is heating up as well, you just will not hear it as much over the running engine