How does BMW change the intake manifold length?
Low end torque and high end power are improved by varying the intake runner length according to a map stored in the engine control module (ECM). Engine vacuum, load and ambient temperature are used by the ECM to determine the rpm at which to switch the intake manifold configuration.
What to do if your intake manifold is stuck?
If it is stuck, spray soapy water around the valve to help getting it out. Once out, remove the vacuum hose from the bulkhead grommet and lay it aside. To remove the alternator and access the electrical connections at the rear of the alternator, remove the air filter housing assembly (yellow arrow).
How does the ECM control the intake manifold?
Engine vacuum, load and ambient temperature are used by the ECM to determine the rpm at which to switch the intake manifold configuration. The changes in the intake manifold configuration are controlled by the ECM, which drives small electric motors to control two flap valves inside the intake manifold.
How are the flaps on the intake manifold controlled?
The changes in the intake manifold configuration are controlled by the ECM, which drives small electric motors to control two flap valves inside the intake manifold. Each flap valve has two possible positions: open or closed.
How much does it cost to replace an intake manifold?
You can expect a total cost of 300$ to 1100$ for an intake manifold replacement. This cost differs a lot depending on the car engine and car model you have. It also depends if you are looking for OEM or aftermarket parts.
What happens when you have a bad intake manifold?
If you have a bad intake manifold, the air-fuel mixture will get different than what it is supposed to be, and therefore the check engine light will show up on your dashboard. When the check engine light shows up – there is also a trouble code stored in the engine control unit that you need to read to continue the troubleshooting.
How to replace the intake manifold on a GM 3.1L?
3) Remove hose clamps from the two ends of the bypass hose and separate them from the metal tubing. These pieces of tubing are pressed into the intake manifold. An 8mm bolt threads into a housing by the water pump. 4) Remove the coolant overflow bottle.
What is the intake manifold of a V8 engine?
The intake manifold consists of the Plenum and the runners; this manifold also holds the throttle valve or throttle body in position. Most intake manifold comes in several separate parts or sections; this is common with the V6 engines and V8 engines.