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Anderson, a friendly 30-year-old who also owns her own marine engineering services business, says that salty crystals inside the exhaust manifold are a telltale sign of saltwater mixing with engine coolant.

The power bump is thanks in part to a redesigned exhaust manifold and new pistons designed to increase the engine’s compression ratio.

“Probably the exhaust manifold,” I’d say, not really knowing what that means.

The weed wacker that sparked this week’s blaze probably had exhaust manifolds that overheated, authorities said.

The department did have about 60 to 65 Explorers that required replacement of the exhaust manifolds, although the issue did not result in fumes in the vehicles’ cabins, he said.