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Intake manifold defective
Controls airflow in intake manifold for combustion.
Costs
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Most Expensive
Moderate costs
Moderate costs
Moderate costs
Moderate costs
Cheapest case
Discussions
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Details
Probability
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HIGH
Typical consequences
If this defect is detected, it may lead to the following problems:
- Engine damage
- Failure of the exhaust emission test (Failure to pass the exhaust emission test)
Functionality swirl flaps
The swirl flap actuator on the intake manifold continuously regulates the swirl flaps and is monitored by a sensor. When the swirl flaps are closed, more fresh air is drawn in through the swirl duct, which increases air turbulence. In four-valve cylinder heads, one intake port is used as the "filling port" and the other as the "swirl port."
In part-load operation, the filling duct can be partially closed by a swirl flap, which distributes the air volume asymmetrically. This promotes greater swirl, improves air-fuel mixing at low engine speeds and increases the degree of filling of the combustion chamber at high engine speeds, which has a positive effect on fuel consumption.