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Replace a Spare part Intake Manifold (Inlet Manifold) – a defective one or if the limit of use has been already reached. Find out useful information about Intake Manifold (Inlet Manifold)

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.

4 tips on intake manifold operation:

  1. Lifetime of the intake manifold depends directly on its operation conditions. Take into account that such parts as sealing elements wear out faster. Usually, gaskets of the intake manifold are replaced on an as-needed basis.
  2. 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.
  3. Avoid ingress of motor oil into the manifold. For this, keep an eye on the condition of the air filter and replace it in due time.
  4. Preventive cleaning of the intake manifold should be performed no less than every 100,000 operational kilometers.

Defects of the intake manifold, their causes and signs

  1. Defects of flaps. They may occur at engine overheating, and due to ingress of oil into the unit. Failure of the flaps may be caused by usage of low-quality materials for their production. When this happens, engine power is decreasing and fuel consumption is increasing.
  2. Breakdown of the flaps control valve. Usually this happens due to soiling, oxidation or wear-out of terminals. The defect can be detected by lowering of engine power at low rpm, failures in its idle run, appearance of vibrations and unusual noise.
  3. Depressurization of the intake manifold. This may be caused by overheating of the part, as well as by mechanical impacts and worn-out sealing elements. As a result, the engine may not start on the first try and may operate with failures. Other signs of this defect are a specific sucking-in sound during engine operation, lowering of power and excessive fuel consumption.
  4. Detachment of vacuum pipes from swirler, their wear or mechanical damages. 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.
  5. Breakdown of an absolute pressure sensor. This may happen because of failures of the flexible piping which connects the inlet fitting of the sensor to the inner space of the intake manifold, as well as because of soiling of the fitting or the piping with combustion products. In this case, fuel consumption will increase, and smell of fuel from the exhaust pipe will be more intense, white smoke may appear, the engine will operate unstably and produce specific roar.

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