Saturday, February 8, 2014
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Fuel tanks have built-in mechanisms to control the flow of gas and gas vapors into the engine. One such assembly is the fuel module assembly, which helps prevent vapors from escaping into the atmosphere as well as pumping fuel where it belongs.
The gas tank module assembly aids in the hard acceleration of vehicles and filters out junk that can clog up the carburetor. In the book "Classroom Manual for Automotive Fuels and Emissions," author Barry Hollembeak writes, "The fuel pump module assembly incorporates the fuel pump, fuel filter, fuel gauge sending unit, and fuel temperature sensor (if used) in a single assembly."
The fuel tank pickup tube isnt always a part of the module assembly. When it is, it is attached by a fuel line. Its job is to pick up dirt, grime, rust and water before they clog up the fuel tank filter, causing the car to sputter along.
Inside of the tank are liquid vapor separators that also stop liquid fuel from invading the engine crankcase. It also stops liquid fuel from entering the area in which fuel vapors are stored. Fuel vapors are ignited, causing the combustion that actually powers the car.
Monday, December 16, 2013
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bad,
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The control module of a vehicle is basically the computer that does the thinking for an engines control system. It affects the functioning of things ranging from a vehicles charging system to its transmission. This is why when the control module goes bad, the engine suffers functionality issues as well.
One of the main things that can cause a control module on a vehicle to go bad is voltage overload. This can occur when a short exists in the circuits of either a solenoid or actuator. Replacing the control module will do no good if these shorts are not dealt with as the replacement control module will experience voltage overload as well.
Another thing that can cause a vehicles control module to go bad is water. Circuits get shorted out and the control modules electrical connections are harmed from the corrosion that builds if water manages to reach the inside of the control module. This is why repairs are usually not even attempted on control modules that come out of flooded vehicles.
Vibration as well as thermal stress has also been known to cause control modules to go bad. This is because they can cause tiny cracks to form in the control modules circuit boards. However, unlike water damage, this type of damage to a control module is repairable.
Thursday, October 3, 2013
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camshaft,
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Camshaft position sensors, also known as camshaft position modules, come in several different types. One of the oldest is the magnetic Hall Effect sensor, which utilizes an interrupter gear to determine the crankshaft and camshafts position.
Passing a metal through a magnetic field transfers some of the magnets force to the metal, creating electricity. A Hall Effect sensor uses a gear-like wheel passing in front of a magnet to create a rapid on/off electrical signal that tells the computer where the crankshaft and camshaft are in their rotation.
An interrupter-type sensor functions well in most cases, but forces the computer to "guess" where the crankshaft is in the on-to-off signal transition. A second type of sensor uses a reluctor ring with a wavy surface. Instead of an on/off signal, this wavy ring causes the sensors output voltage to gradually rise and then suddenly fall off. This action gives the computer constant input so it can keep adjusting the fuel injector and ignition timing.
No permanent magnet is truly permanent, especially when its been forced to induce current for years on end. Over time the magnet weakens, reducing the sensors voltage output and sending a false or unsteady signal to the computer. This weakening can result in cylinder misfires, loss of power and an unsteady idle.
