Is an idle intake pressure of 60 normal?
2 Answers
An idle intake pressure of 60 is abnormal. The intake pressure of a vehicle during idle generally ranges between 27-30Kpa. Below is relevant knowledge about the intake pressure sensor: 1. The intake pressure sensor detects the engine's intake volume to control the basic fuel injection amount. If this sensor fails, the computer cannot receive the intake volume, leading to either excessively rich or lean air-fuel mixtures. An excessively rich mixture can cause black smoke, incomplete combustion, or even backfiring in the exhaust pipe. An excessively lean mixture can result in insufficient fuel, backfire, lack of power, poor acceleration, or even difficulty starting. 2. The intake pressure sensor detects the absolute pressure in the intake manifold behind the throttle. It senses changes in the absolute pressure within the manifold based on engine speed and load, then converts this into a signal voltage sent to the engine control unit (ECU). The ECU uses this signal voltage to control the basic fuel injection amount.
I've been running an auto repair shop for over 20 years and have encountered many cases of high idle intake pressure. 60kPa is generally abnormal. The normal idle range should be between 20 to 40kPa - sufficient vacuum results in lower values. 60kPa is too high, usually indicating vacuum system issues like cracked vacuum hoses or faulty sensors. More air intake naturally increases pressure. This causes unstable idle, severe vehicle shaking, and sharply increased fuel consumption. One of my customers had this exact problem - turned out to be a loose intake pipe that just needed tightening. For troubleshooting, first listen for hissing sounds in the engine compartment (sign of air leaks), then use a diagnostic tool to check MAP data. Handle minor issues yourself, but seek professional repair for major problems. Otherwise, it's both dangerous (stalling at idle can be deadly) and costly - that loose intake pipe could've led to bigger engine damage if ignored.
