Is there a problem with the torque converter?

It could be a problem with the transmission, or the transmission could be perfectly fine and it could be a problem with the torque converter. Torque converter issues on a lot of older transmissions can be diagnosed by carrying out a stall-speed test.

Can a stall speed test be done on a torque converter?

Torque converter issues on a lot of older transmissions can be diagnosed by carrying out a stall-speed test. Below we have outlined how you can safely and easily conduct a torque converter test.

What does high rpm reading on torque converter mean?

An RPM reading lower than your engine and torque converters specifications means that the torque converter need a repair or replacement. An unusually high RPM reading indicates a slip in the transmission, which will have to be investigated.

What causes the vanes on a torque converter to bend?

Wear and tear in torque converters will cause the vanes to bend, resulting in slow shifting or failure to drive. A symptom of bent vanes is that the engine will rev higher than usual, with the sound turning normal as the system warms up.

What is the torque converter failure number on a Chevy Colorado?

The manufacturer issued technical service bulletin number: 4942742 pie0405c (engineering information torque converter shudder). The approximate failure mileage was 13,500. Tl the contact owns a 2019 Chevrolet Colorado. The contact stated that the vehicle was taken to the shop twice for transmission failure.

What are the symptoms of a torque converter lockup?

One of the prominent symptoms of a problem with torque converter lockup, is that the engine will rev up and down while it is idling. This may result in a stall, but mostly will cause the vehicle to lurch forward when not in park. Engaging in Gears Randomly

Where is Bob Hook Chevrolet Colorado torque converter located?

Bob hook Chevrolet 4144 bardstown rd, louisville, ky 40218 (844) 212-4818 diagnosed and repaired the torque converter and changed the fluid. The contact were still having the same failure.

Are there any problems with the torque converter?

A very common problem is that the torque converter bearings will get worn out. This does often not cause any slipping or other problem with the transmission, but it can create bearing noises from the transmission.

What causes a GM torque converter to lock up?

Most of the time it is a stuck Torque Converter Clutch (TCC) solenoid, but this is not the only cause of this problem. General Motors has issued a few Technical Service Bulletins (TSBs) relating to this problem. There is also a specific diagnostic procedure to determine the exact cause of the TCC problem.

What happens when a torque converter slips while driving?

Transmission overheating When the torque converter is slipping while you are driving, it can cause unnecessary heating of the transmission fluid which may even get so hot at a point that it will boil. A slipping torque converter will wear out the transmission really fast.

Why does my torque converter shudder when I Turn on the engine?

As mentioned, converter shudder is usually temperature related. As transmission fluid recycles back through the engine turbine, it picks up frictional heat.

What causes the torque convertor clutch to disengage?

There is a solenoid in your GM converter that causes the the torque convertor clutch (TCC) to engage and disengage. When the TCC solenoid receives a signal from the engine control module (ECM), it opens a passage in the valve body and hydraulic fluid applies the TCC.

What causes the torque converter to lock in gear?

When the TCC solenoid receives a signal from the engine control module (ECM), it opens a passage in the valve body and hydraulic fluid applies the TCC. When the ECM signal stops, the solenoid closes the valve and pressure is vented, causing the TCC to disengage. This lets the torque converter lock in “gear” or unlock out of “gear.”

What is the diagnostic code for a torque converter?

The P0741 diagnostic trouble code can be difficult to diagnose. Be sure to check all of the transmission wiring, the TCM, and the TCC solenoids. Keep in mind that the transmission pan may have to be dropped to get to all of the wiring.

Why do I need to lock up the torque converter?

The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter. Lockup reduces slippage in the converter increasing fuel economy. For the converter clutch to apply, two conditions must be met: Internal transmission fluid pressure must be correct.

What is the purpose of the torque converter clutch?

The purpose of the Transmission Converter Clutch (TCC) feature is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise mode. The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter.

What causes a car to stall when the torque converter fails?

Vincent Ciulla is a certified master automotive technician who has diagnosed and repaired light trucks, domestic and foreign cars, and diesel engines, for more than three decades. A common problem on many General Motors cars is the Torque Converter Clutch fails to release and causes the car to stall when it comes to a stop.

When does the converter disengage in a car?

This allows the converter clutch to apply when hydraulic pressure is correct. The TCC is very similar to the clutch in a manual transmission. When engaged, it makes a direct physical connection between the engine and transmission. Generally, the TCC will engage at about 50 mph and disengage at about 45 mph.

How long does it take to stall a torque converter?

With one foot on the brake pedal, press the accelerator all the way for 2-3 seconds with the other foot. Be careful not the exceed 5 seconds or the transmission could blow out.The stall speed is the RPM the engine maxes out at.

Why does my torque converter make a whirring sound?

Whirring sound when starting up the engine – When the one-way clutch within the torque converter wears, it starts making a whirring sound. But this sound could also be caused by the formation of vacuum bubbles in the fluid as the pump fails.

What causes a shudder in the torque converter?

Shudder in the Torque – You’ll know this is happening if the engine block shakes or quivers even at a slight acceleration, and even on smooth surfaces. The cause of this issue is a torque converter failing to effectively distribute power for the transmission.

How does the pump work in a torque converter?

The pump of the torque converter is made up of small fins that make the connection to the flywheel possible. They also serve to pump the transmission fluids to the outside of the mechanism. This creates a vacuum that in turn delivers more fluid to the central part of the device.

What does lock up clutch on torque converter do?

More modern iterations of the torque converter may come with a lockup clutch. This combines the two separate halves of the torque converter, which improves the car’s efficiency because of reduced slippage.

What does it mean when your torque converter is grinding?

Loud grinding or clacking sounds – These are never a good sign. When being caused by the torque converter, it indicates that its internal mechanism is disintegrating. Stop driving immediately and call in a technician to assess the damage.

What does stall speed mean on a torque converter?

Be careful not the exceed 5 seconds or the transmission could blow out.The stall speed is the RPM the engine maxes out at. An RPM reading lower than your engine and torque converters specifications means that the torque converter need a repair or replacement.

What causes the gears to slip on a torque converter?

If there isn’t enough pressure to control the flow of the hydraulic transmission fluid, too much or too little will get into the transmission and cause the gears to slip as it shifts. This can often be due to low or bad fluid as well, so be sure to check that first.

What does a vane do in a torque converter?

Various components within the torque converter use vanes, similar to a turbine, to act on the transmission fluid within the unit to create a fluid coupling, as well as provide the fluid pressure that the transmission needs.

Why is transmission fluid important in a torque converter?

The transmission fluid is an important part of the torque converter in that it is used to provide the fluid coupling and smooth starts and without stalling the engine when the vehicle is stopped in gear.

How to tell if your Dodge Ram has a bad torque converter?

Before trying to diagnose whether your Ram has a bad torque converter, you’ll want to drive to let the transmission warm up to its normal operating temperature. It takes a bit longer for the transmission to warm up than the engine. Give it a few extra minutes after the engine warms up all the way.

What are the symptoms of a bad torque converter?

Symptoms of a bad torque converter include a vibration, too much RPM on the highway, and slipping. Here are some of the most common bad torque converter symptoms that could happen to your Ram.

How to test a torque converter without uninstalling it?

Remember to not release the brake pedal. With one foot on the brake pedal, press the accelerator all the way for 2-3 seconds with the other foot. Be careful not the exceed 5 seconds or the transmission could blow out.The stall speed is the RPM the engine maxes out at.

Can a bent vane cause a torque converter to not work?

A symptom of bent vanes is that the engine will rev higher than usual, with the sound turning normal as the system warms up. Torque converter issues are a possible cause of such issues in the vehicle.

How is the torque converter bolted to the flywheel?

As shown in the figure to the left, there are four components inside the very strong housing of the torque converter: The housing of the torque converter is bolted to the flywheel of the engine, so it turns at whatever speed the engine is running at.

What does a torque converter do on a Honda?

A torque converter is a type of fluid coupling, which allows the engine to spin somewhat independently of the transmission.

What causes rough idling in a torque converter?

If you feel that your idle is a bit jumpy and sometimes too low and sometimes too high, it could be a torque converter problem. If the torque converter is faulty, it might create unexpected pressures inside the torque converter, which can cause rough idling. Rough acceleration is also a known symptom when it comes to defective torque converters.

How much does it cost to replace a torque converter?

Most auto repair shops will charge someone anywhere from $600 to $1000 for a torque converter replacement job. If you would rather do the replacement job yourself, then a new torque converter will cost anywhere from $150 to $500 . The exact cost depends on the make and model of your vehicle.

How do they check a torque converter?

How to Test a Torque Converter Start the engine and let it warm up First, you should start the engine and let the transmission oil warm up to around 40 degrees. Move shifter into gear Now you can try to apply the drive gear and listen carefully if you can hear any signs of noise from the torque converter. Test drive

What is torque convertor lock up?

Lock-up torque converters contain a torque converter clutch. When the clutch engages, it allows the converter to “lock” the engine to the transmission input shaft, providing a direct 1:1 engagement between the engine and transmission.

How does torque converter work in cars?

A torque converter is a device inside an automatic transmission housing set between the engine and the gears. Essentially an advanced hydraulic fluid coupling, the torque converter transmits and multiplies engine torque while also allowing the vehicle to come to a complete stop without touching or shifting the transmission.

What causes transmission fluid to leak out of torque converter?

A faulty seal of the torque converter will cause the transmission fluid to leak out of the torque converter, and thus the pressure inside the converter will be lost. Low pressure inside the torque converter will cause slippage, overheating, and other strange symptoms.

What kind of torque converter does a Camaro have?

A Quick Lock in the 1970.5 Camaro of Russell Wullenwaber that will be run in the Pro Stock class of the National Hot Rod Diesel Association. The new converter drive took the ease of automatic transmission torque converter maintenance and combined it with the durability of a manual gear box.

Who are the manufacturers of torque converter drives?

Currently, there are a few major companies in the United States designing converter drive devices, including Brunos Automotive, Lenco, and Quick Drive. Though similar, each company has a different approach to achieving the same goal: combining the benefits of a manual with the ease of maintenance of an automatic.

Which is worse a bad torque converter or bad transmission?

When diagnosing driveline problems, one of the bigger challenges can be diagnosing a bad torque converter versus a bad transmission. The symptoms are often quite similar. Often people think that their transmission is going out, because the symptoms of a bad tour converter are so similar to the symptoms of a bad transmission.

What to do if your torque converter is slipping?

If you are experiencing a slipping torque converter and you have replaced the transmission fluid and filter and even done a transmission flush to it, it’s time to remove the transmission from the engine and inspect the seals on the axle into the transmission. Here is a video of how to replace the seals inside a transmission.

How does a torque converter work in a car?

A torque converter uses power from the engine in an automatic transmission to change gears. Think of it as the clutch in a manual transmission. Each time you move between gears, you have to press down and slowly release the clutch. The blade assembly inside of a torque converter controls the flow of transmission fluid.

Why are the bearings in my torque converter worn out?

A widespread problem is that the bearings in the torque converters are worn. This does not cause slippage or other transmission problems but can cause bearing noises from the transmission. If you hear bearing noises from the transmission, check the transmission fluid, and see if you can see metal parts inside the transmission fluid.

What kind of test do you do on a torque converter?

On some electronically controlled transmissions, a stall-speed test will set off your check engine light. Prepare your car Before testing your torque converter, make sure all your fluids are in good condition.

What’s the Flash Speed on a torque converter?

Flash occurs the instant you release the foot brake and the rotating inertia (which is “stored” in the engine flexplate) is released. In many cases, this flash speed can be anywhere from 500-2,500 rpm higher than the foot brake stall speed.

Torque converter issues on a lot of older transmissions can be diagnosed by carrying out a stall-speed test. Below we have outlined how you can safely and easily conduct a torque converter test.

Where do I find the torque converter part number?

Chrysler, Ford, General Motors etc (alphabetically), then by Transmission Type (again alphabetically) and finally by Converter Code (TCS Code). The section below the Converter Part Number (Grey Band) is for information unique to the converter that may assist you in the correct idenification.

How to tell if your car has a torque problem?

Now, how to detect when the car has developed a torque problem would have you look up to these signs. When you see or hear any of the listed signs then it is likely a torque fault. 1. Strange noise while driving. When you notice some whining kind of sound and it keeps reoccurring, this can be a torque problem.

The lack of control makes it easy to forget, so it will slip into neutral without you noticing. Either way, this is a sign that you need to head to a mechanic, as this is one of the more prominent symptoms of a bad torque converter.

Can you test a torque converter without taking it apart?

There are not a lot of things you can do to test the torque converter without taking it apart. But, there is a way you can check for any signs that the torque converter is worn out. Here is a way that I’m normally using to check for any problems with the torque converter.

How does the torque converter work in a car?

The amount of torque that your car has will determine how fast it will accelerate, subject to other factors specific to each vehicle. In cars, torque is generated by turning the car’s crankshaft. This energy is then sent from the torque converter to the transmission of your car.

Why does my torque converter feel bumpy on the road?

Your car is shuddering when you’re moving on a smooth road, yet it feels like you’re on a rocky surface which makes the ride bumpy – it is a sign that there could be a problem in the lockup clutch located in the torque converter.

What makes a torque converter shudder at low speed?

Torque Converter Shudder Problems. A torque converter is the fluid coupling between an engine and transmission that allows the engine to idle at low speed without engaging the transmission. A torque converter uses an engine-driven turbine (fan) to push fluid through a matching turbine attached to the transmission.

What are the signs of a failing torque converter?

6 Signs of a Failing Torque Converter Loss of Acceleration. If your vehicle feels more sluggish than normal or it is physically shuddering when you step on the gas pedal-as if it’s struggling to accelerate as Slipping Between Gears. Automatic vehicles should shift smoothly between gears. Vehicle Won’t Shift at All. Transmission is Overheating. Transmission Fluid Leak.

What can cause torque converter to go bad?

Causes of Torque Converter Problems: Jeep Liberty Low or Dirty Transmission Fluid. Transmission fluid is the lifeblood of the transmission and the torque converter bolted to it. Worn Clutches. The clutch that locks the transmission to the engine at highway speed can wear out just like a normal manual transmission clutch. Bad Seals. Loose Torque Converter Bolts.

What are bad torque converter symptoms?

Symptoms of a bad torque converter Shuddering. An example of shuddering is when you drive on a smooth road, and your car begins to shudder like you are on a rough surface. Overheating. Overheating is another sign of a bad torque converter. Slipping. Contaminated transmission fluid. Unusual sounds. Increased stall speed.

Why do torque converters fail?

Old and worn out internal vehicular components will also lead to failures in the torque converter. Wear and tear in torque converters will cause the vanes to bend, resulting in slow shifting or failure to drive. A symptom of bent vanes is that the engine will rev higher than usual, with the sound turning normal as the system warms up.

How does the torque converter clutch system work?

P1744 Ford Description The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled.

What kind of fluid do I need for my torque converter?

Lucas brand is the most popular and is recommended by specialists like Mr. Transmission, but is usually the most expensive. Those with older (pre-2000) GM and Chrysler transmissions can try adding a quart of Ford Type F transmission fluid, since it contains friction modifiers that the stock Dextron does not.

How much clearance do you need for a torque converter?

Description. It should have 1/16 to 1/8″ (ON GM ONLY) of clearance between pads on converter and flex plate. If you have more than 1/16 to 1/8″, install equal thickness washers to reduce clearance to 1/16 to 1/8″ (ON GM ONLY). If not enough clearance, remove transmission and check to see if converter is seated in front pump properly.

How do you remove converter from Ford transmission?

By removing converter dust cover, converter flywheel bolts are exposed. On Ford and Chrysler transmissions rotate convertor to locate drain plug. Remove and drain converter. Step 3 Remove converter from flywheel. Remove four (4) bolts on Chrysler, three (3) bolts on GM, and remove four (4) nuts on Ford.

Why does my car converter not lock up?

The two basic issues are: 1. the converter won’t lock up, or… 2. the converter is locked up all the time and kills the engine when you put the transmission in gear. In the case of no converter lockup, we first need to road test the truck to make sure the computer is commanding lockup.

Is the lockup valve working on a Ford TorqShift?

Engaging the transmission with the TCC applied will be very hard on the TCC lining, so keep your testing to a minimum. If the engine stalls with the test tool in place, the converter clutch and lockup valve are working properly.

When does the torque converter go lock up?

It generally occurs at part throttle and light acceleration, between 15 and 50 miles per hour, just before the shift to one of the top gears where the converter reaches “lock-up.”.

Can a damaged torque converter cause the car to stay in gear?

However, a damaged torque converter can cause the car to stay in gear even when the driver has come to a stop. This converter also can lock into direct drive especially if the clutch plate’s friction material has worn away. 4. Faulty Needle Bearings

What is the code for torque converter clutch?

A P0740 OBD-II code is a generic trouble code that is supported by many cars. But while this diagnostic code can appear on a variety of vehicles, the steps for diagnosis and repair may vary depending on the vehicle’s make and model. The torque converter clutch creates a mechanical connection between the engine and transmission.

What happens when torque converter code p0740 is triggered?

You may experience shifting problems when code P0740 is triggered. If the TCC is stuck on, it may cause the vehicle to stall when coming to a stop. A TCC that isn’t engaging/disengaging properly can cause a shudder that’s felt at certain speeds. Failing to engage the torque converter clutch results in slippage that reduces fuel mileage.

Where is the SAE torque converter code located?

Note: Although code P0740 is a generic code specified by the Society of Automotive Engineers (SAE), the code’s definition may vary depending on the vehicle manufacturer. The torque converter is located between the rear of the engine and the front of the automatic transmission.

Which is the best torque converter for a Ford 7.3L?

The Diesel Performance Converters DPC F4RMDLS Low Stall Medium Duty Triple Disc Torque Converter is an excellent choice for your 1994-2003 Ford 7.3L Powerstroke. The Medium Duty Torque Converter features a studded billet cover and DPC’s proven friction materials making it a perfect option for those builds under 500HP.

What kind of clutch drive does a torque converter use?

The ATS Viskus Clutch Drive is the heart of the ATS Five Star torque converter. The ATS Viskus Clutch Drive, along with the fluid-coupling portion of the torque converter, share in the increase of transfer of power through the torque converter.

What is the code for torque converter clutch solenoid?

Code P0740 indicates that the control module detects an electrical problem with the torque converter clutch solenoid or the solenoid’s circuit. Note: Although code P0740 is a generic code specified by the Society of Automotive Engineers (SAE), the code’s definition may vary depending on the vehicle manufacturer.

Where can you find a torque converter in a car?

Torque converters can be found in almost all cars with automatic transmission. This is probably one of the reasons why you have heard of so many failed torque converters. In this article, you will find all information you need about the torque converter.

What causes the torque converter to lock up on a Ford Explorer?

These are the most common problems that can cause the P0741 in the Explorer: Bad Torque Converter Lock up Solenoid– The solenoid that allows the torque converter to lock up is often the culprit. Here’s a good video on how to diagnose and repair the TCC Solenoid.

What is the transmission code on a Ford Explorer?

The Explorer uses a clutch in the torque converter to lock the engine and transmission together at highway speed. P0741 can register whenever this connection is not happening at all or happening properly. P0741 will not affect the way that your Ford Explorer’s engine performs at all. It is purely a transmission related code.

Are there any problems with the torque converter on a Ford F-150?

Ford F-150 owners have reported 32 problems related to automatic transmission torque converter (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Ford F-150 based on all problems reported for the F-150.

What causes a bad torque converter in a Ford Explorer?

In the Ford Explorer, a bad torque converter is often caused by bad transmission fluid, worn clutches, bad seals, or loose bolts. Symptoms of a bad torque converter include a vibration, too much RPM on the highway, and slipping. Bad Torque Converter Symptoms: Ford Explorer

Can a torque converter be installed in a transmission?

As you raise your transmission to install into your vehicle, be sure that the torque converter remains fully installed in the transmission. Curt takes apart a pump for an AOD to show what can break and where the converter installs into.

Why does my torque converter feel like it is slipping?

Slipping Transmission (Low Speed) The torque converter “stall speed” is the speed that the engine needs to be turning before the torque converter will begin engaging the transmission. When a torque converter is malfunctioning it can cause this stall speed to change and feel like the transmission is slipping.

Why do you need a locking torque converter?

Nearly all modern automatic transmissions have a locking torque converter. A locking converter has clutches in it that lets the transmission make a physical connection with the engine. This eliminates operating inefficiency when it is at high speed (usually after about 45 miles an hour).

Can a torque converter blow out a gasket?

To worsen the situation of a worn gasket, the torque converter’s pressure on the transmission fluid can blow out the seals as well, especially if the torque converter is malfunctioning.

Why does my torque converter not transfer power?

As transmission fluid recycles back through the engine turbine, it picks up frictional heat. Once the amount of heat generated by this friction surpasses the transmissions cooler’s ability to shed it, the fluid thins and power transfer becomes inconsistent.

Is there a problem with the torque converter?