Although the torque converter clutch is not part of the engine, it can make the car feel like the motor has a problem. The torque converter clutch is also known as a lock up converter. The lockup clutch has many purposes and is part of the transmission. A regular converter in an self-acting transmission is made to slip at idle so that the car doesn't move. As the accelerator is pressed the Rpm's raise and the torque converter will start to lockup or engage. When the converter engages the car will move.
Even though the torque converter is engaged it never wholly engages the way a by hand transmission car clutch will. It will always slip a little, which is not very efficient. This is why a by hand transmission car gets great gas mileage and has more power than an self-acting transmission car. To growth power and in general fuel mileage, a Tcc is added to an self-acting transmission.
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The torque converter clutch is an electronic clutch that will engage the motor and drivetrain 100 percent. The Tcc is made to engage commonly only in the top gear when the car is cruising, not accelerating. The lock up converter will disengage when the accelerator is pressed hard enough. Over time the clutch will wear out especially if the car ever towed whatever and was operated in overdrive (top gear). This will wear the clutch out prematurely. If you have a tachometer you will see the Rpm's drop a few hundred when it engages.
If the Tcc is bad one of three things will commonly happen. First, the car will tend to rev up and down as it engages and disengages, not being able to keep the converter clutch locked up. Second, the converter clutch will engage randomly in gears that it shouldn't even engage in usually. Third the clutch doesn't want to disengage. As you slow down the car won't downshift and if you try to accelerate the Rpm's will be so low that the car will have strangeness appealing quickly. In greatest cases the lockup converter will try to keep the car appealing as you try to stop at a stop light, or will stall out and die.
Many citizen think that this problem is arrival from their motor because it causes the car to stall. The check motor light will not always show an error for the Tcc. Most lockup converters are controlled by a wire or wires that plug into the transmission. It is potential on some models to naturally disconnect this plug. This is not a problem and will only cause you to lose a wee gas mileage. The Rpm's will run slightly higher than before but will not harm whatever or be an issue.
Torque Converter Lockup