In a turbocharged engine, a leak that causes boost to fall short of the target would affect the MAP sensor reading as which of the following?

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Multiple Choice

In a turbocharged engine, a leak that causes boost to fall short of the target would affect the MAP sensor reading as which of the following?

Explanation:
In a turbocharged engine, boost is the pressure inside the intake manifold, and the MAP sensor measures that manifold pressure. If there’s a leak, compressed air escapes before it reaches the cylinders, so the actual pressure in the manifold can’t reach the commanded boost. The MAP sensor then reads a pressure lower than what the ECU expects for that operating point. So the reading would be lower than normal. A higher reading wouldn’t happen from a leak, and unless the leak is changing, the value wouldn’t be erratic or unchanged.

In a turbocharged engine, boost is the pressure inside the intake manifold, and the MAP sensor measures that manifold pressure. If there’s a leak, compressed air escapes before it reaches the cylinders, so the actual pressure in the manifold can’t reach the commanded boost. The MAP sensor then reads a pressure lower than what the ECU expects for that operating point. So the reading would be lower than normal. A higher reading wouldn’t happen from a leak, and unless the leak is changing, the value wouldn’t be erratic or unchanged.

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