What are the influencing factors of P0106 intake manifold absolute pressure?
2 Answers
Factors affecting intake manifold pressure: 1. Throttle opening: The smaller the throttle opening, the greater the suction effect formed by the piston during intake, resulting in higher intake manifold vacuum suction, i.e., lower intake manifold pressure. 2. Engine speed: The higher the engine speed, the greater the suction effect formed by the piston during intake, resulting in higher intake manifold vacuum suction, i.e., lower intake manifold pressure. 3. Sealing performance: This includes the sealing of the intake manifold and cylinders. The better the sealing performance, the greater the suction effect formed by the piston during intake, resulting in higher intake manifold vacuum suction, i.e., lower intake manifold pressure.
After years of working on cars, I've seen P0106 countless times, and the causes of intake manifold pressure errors are varied. The most common issue is vacuum leaks, such as aging rubber hoses on the manifold developing small cracks or the manifold itself having fractures, allowing air to leak in and causing pressure signal drift. Another frequent problem is the MAP sensor itself—either carbon buildup blocking the sensing hole leading to inaccurate readings or internal circuit failure producing erroneous signals. Sometimes, wiring harness issues like poor contact or short circuits can also interfere, causing the ECU to report a fault when it fails to receive normal data. Other factors, such as intake system blockages or significant engine load changes (like during sudden acceleration), can also trigger this issue. To fix it, you need to troubleshoot step by step: start by spraying soapy water on vacuum lines to check for bubbles, then test the sensor's resistance, and ensure the wiring is intact. If you can't figure it out, it's safer to visit a professional shop—don't force it.
