What is the intake manifold pressure?

2 Answers
DiIsla
07/28/25 6:12pm
Intake manifold pressure ranges between 40-80 KPA. Here are the relevant details: 1. Manifold vacuum: It not only provides pressure signals to determine engine load but also assists systems like brakes. This is why the brake pedal feels much lighter after the engine starts, thanks to vacuum assistance. Certain types of cruise control systems also utilize manifold vacuum. 2. Leakage: Any leaks or improper modifications to these vacuum tubes can cause engine control malfunctions and affect brake operation. To ensure driving safety, avoid making improper modifications to vacuum tubes.
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Catherine
08/12/25 12:01am
When it comes to intake manifold pressure, I've been driving for decades. This thing is usually in a vacuum state when the engine is idling, with a normal range of about 20 to 25 inches of mercury. Too high or too low is no good. For example, if the pressure is too high, there might be a leak in the intake system, and you'll feel the power lagging; if it's too low, it indicates a blockage or pump issue, and the car will gasp for breath during acceleration. I use the dashboard display to check the vacuum value every time I start the car cold. I also make sure to clean the intake pipe regularly to avoid carbon buildup affecting the pressure. This way, the car runs smoother, saves some fuel money, and extends the engine's lifespan.
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