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Are Inlet Manifold Pressure and Manifold Absolute Pressure the Same?

When you look at the readings from your scanner, you might wonder about inlet manifold pressure (IMP) and manifold absolute pressure (MAP). While they are related, they are not exactly the same thing.

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Published onAugust 28, 2024
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Are Inlet Manifold Pressure and Manifold Absolute Pressure the Same?

When you look at the readings from your scanner, you might wonder about inlet manifold pressure (IMP) and manifold absolute pressure (MAP). While they are related, they are not exactly the same thing.

IMP measures the pressure inside the intake manifold. This pressure can vary based on engine load and throttle position. MAP, on the other hand, indicates the absolute pressure in the manifold. It is measured without considering atmospheric pressure.

Both pressures are crucial for engine performance. In a turbo diesel intercooler engine, these readings can fluctuate significantly. A reading of 28 psi during acceleration is common for turbocharged engines. It indicates that the turbo is boosting the air pressure effectively. When you see 13 psi at idle, that’s also typical; the engine is not under load, so the pressure decreases.

  • 28 psi during hard acceleration shows good turbo function.
  • 13 psi at idle suggests normal engine operation.

If your readings are consistently outside these ranges, it may signal a problem. If you are ever in doubt, consulting with a trusted mechanic can provide clarity and reassurance.

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