What is the normal intake pressure for Peugeot 307?
2 Answers
The normal intake pressure range for Peugeot 307 is between 40-80KPA. Intake pressure refers to the average absolute pressure in front of the intake valve during the engine cylinder's intake process. The intake pressure sensor, abbreviated as MAP (Manifold Absolute Pressure Sensor), is connected to the intake manifold via a vacuum tube. It senses the vacuum changes in the intake manifold as the engine's speed and load vary, then converts the internal resistance changes of the sensor into voltage signals for the ECU to adjust fuel injection and ignition timing. The main parameters of the intake pipe affecting engine intake performance are summarized as follows: intake pipe inlet diameter, intake manifold diameter, intake manifold length, and plenum chamber volume. Intake pipe inlet diameter: Determines the total intake volume and is set based on the throttle diameter. Intake manifold diameter: Determines the intake volume per cylinder and is set based on the intake port entrance diameter. Intake manifold length: Affects the dynamic effect. In intake pipe optimization calculations, this is treated as a target parameter for optimization. Plenum chamber volume: Affects the pulsation (resonance) effect. An appropriate plenum chamber volume not only enhances charging efficiency by utilizing the pulsation effect but also maintains a relatively stable pressure environment in the plenum chamber, providing favorable conditions for leveraging dynamic effects while eliminating interference between cylinders and improving intake uniformity.
I've been tinkering with cars for a while now. For a Peugeot 307, the intake pressure at idle should normally be in the range of 25 to 35 kPa (roughly 0.25-0.35 bar), which is read from the manifold absolute pressure (MAP) sensor. If you notice the pressure is higher than normal, say over 40 kPa, it could indicate a vacuum hose leak or a faulty MAP sensor, leading to unstable engine idle or increased fuel consumption. On the other hand, if the pressure is too low, like below 20 kPa, it might affect the air-fuel mixture, making the car feel sluggish during acceleration. My advice is to first check the intake piping and connections for any leaks, then use an OBD scanner to check real-time data—it's a simple, inexpensive way to quickly pinpoint the issue. Regularly monitoring this value can help catch potential problems early, so you don't end up with major repairs down the line.
