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The air filter box
Probably nothing much but theoretically by feeding hotter ,less dense air from the engine compartment rather than cooler denser air from the front intake might prevent the engine running better/ slightly more economically. Governed by the difference in the 2 temperatures i.e. more likely to be of benefit after a long journey in hot conditions. Technically since the MAF unit works on the thermal principle ----the sensor is one leg of a heated wheatstone bridge circuit and measures the density of air passing by how much its cooled by the passage of the engine air charge it should compensate anyway.Also I noticed that the rubber plastic air duct that feeds air from the front of the engine bay to the air filter box had become loose and was no longer attached, so it wasn't supplying air to the box. What is the likely effect of that? Reduced fuel economy, drop in performance? Other effects?
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