Breakdown of an absolute pressure sensor. These defects occur due to influence of high temperature on plastic and rubber parts of the manifold and are usually accompanied by vibrations during idle run, unusual noises, rattling during engine operation as well as loss of dynamic performance and decrease in torque. Detachment of vacuum pipes from swirler, their wear or mechanical damages. Other signs of this defect are a specific sucking-in sound during engine operation, lowering of power and excessive fuel consumption. As a result, the engine may not start on the first try and may operate with failures. This may be caused by overheating of the part, as well as by mechanical impacts and worn-out sealing elements. Depressurization of the intake manifold. The defect can be detected by lowering of engine power at low rpm, failures in its idle run, appearance of vibrations and unusual noise. Usually this happens due to soiling, oxidation or wear-out of terminals. When this happens, engine power is decreasing and fuel consumption is increasing. Failure of the flaps may be caused by usage of low-quality materials for their production. They may occur at engine overheating, and due to ingress of oil into the unit. Preventive cleaning of the intake manifold should be performed no less than every 100,000 operational kilometers.ĭefects of the intake manifold, their causes and signs. 
For this, keep an eye on the condition of the air filter and replace it in due time. Avoid ingress of motor oil into the manifold.If there is a need to demount the intake manifold during repair, always check gaskets condition, and it is better to replace them with new ones.Usually, gaskets of the intake manifold are replaced on an as-needed basis. Take into account that such parts as sealing elements wear out faster.
Lifetime of the intake manifold depends directly on its operation conditions.An intake manifold is a closed chamber with outlet branch pipes and a system of flaps, with the help of which fuel-air mixture is prepared and uniformly distributed to engine cylinders, or air supply is performed in engines with direct injection.
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