Owning a car comes with lots of responsibilities. Part of owning a car is dealing with a lot of problems, from small to big breakdowns, both electrical and mechanical. You are most likely to experience more minor breakdowns due to faulty electrical components. Among the components that occasionally fail is the starter motor, which turns the engine during ignition. However, signs such as squealing or whining noise, or the presence of dashboard lights but no engine power, indicate a problem with the starter motor. Fortunately, checking a starter motor isn’t too complicated, and troubleshooting this type of problem can be a DIY job. Let’s consider the right procedure for checking your starter motor.

HOW THE STARTER MOTOR WORKS

Before we get into how to test a car jump starter, let’s understand how it works.

A starter motor draws power from the battery used and uses the engine’s flywheel to start the process of combustion. Starter motors are found in modern cars and replace the old manual method of starting engines with a hand crank. This makes starting the engine safer and more efficient. This car component uses a solenoid for sending power to the motor, a motor, and a pinion gear for engaging the engine with flywheel.

SIGNS OF A BAD STARTER MOTOR

If you notice the following warning signs, then your starter motor may be bad.

1.     A grinding noise.
2.     Burning or smoke smell.
3.     Dashboard lights may come on but the engine doesn’t crank.
4.     You hear a clicking sound when you try to put on the engine.

WAYS FOR TESTING THE STARTERS MOTOR

Although the starter motor is still a small component; it can be tested in several ways, not just one. After all, it doesn’t work on its own; it still needs a battery and other components to function correctly.  This means the problem could be with the starter motor itself or with other parts.

The following are different ways to check your car’s starting system.

1.CHECK FOR SIGNS OF A STUCK PINION GEAR

The pinion gear of a starter motor is responsible for moving the crankshaft by engaging with the flywheel and turning it, and disengaging once the engine is running. As a moving part, the pinion gear can seize and stop working.

Here’s what you need to do to see if the pinion gear is causing a problem.

•    Do a Visual Inspection

To test the starter motor without removing it, you will need to visually inspect for signs of a stuck pinion gear. When the headlights dim when you try to start the engine, it is a sign that the pinion gear is stuck on the flywheel.

You will also hear the sound of an engine trying to start, along with dimmed lights, when the pinion ear is faulty. However, if there’s a clicking sound without the noise of an engine trying to start, and the lights also dim, the problem is likely the battery. In this case, you should check the electrical components directly.

• Release The Stuck Pinion

Once you are sure the pinion gear is stuck, do not use the starter motor until you’ve freed it. Locate the square tab on the back of the starter cylinder and turn it to release the jam. If there is no such bathtub and you have a manual transmission, turn off the ignition, put it in second gear, release the handbrake, and rock the car back and forth until the pinion gear dislodges. If it has an automatic transmission, it is best to remove the starter motor and test it on a test bench.

2. CHECK IF THERE ARE ANY PROBLEMS WITH THE ELECTRICAL SYSTEM

In a car, there is what is called the “electrical trifecta”, made up of the battery, the alternator, and the starter motor. Each one complements the others in a mechanical and electrical cycle. The battery powers the starter motor, which turns the engine, and the alternator turns to recharge the battery.

When one of these components fails, it will likely affect the other components as well. Follow the steps below to check for electrical problems with the starter motor.

•    Inspect the Battery for Loose Connections and Voltage

A simple visual inspection can easily identify faulty electrical connections. Try inspecting under the hood for loose wires or corrosion that might be restricting electrical flow. Clean the battery terminals and reconnect and disconnected wires. For more accurate inspection, check the voltage of the battery, if it shows signs of a problem.

•   Examine the Solenoid

When there is no problem with the battery but your car won’t start, it’s likely a faulty solenoid. A starter solenoid is an electromagnet attached to the engine that’s prone to poor connections.

Once you’ve resolved any disconnections to the solenoid but the problem persists, you should perform a circuit test on this device. A test light won’t illuminate if there’s still a connection problem, but if it does, there is a problem with the solenoid or the starter motor itself. Depending on the result of your diagnosis, you can proceed with self-repair or take the component for professional work or parts replacement.

3. TEST YOUR STARTER

What is a bench test? First, bench tests should depend on your level of confidence in your abilities. If you are not that confident, you can leave the bench tests to the professionals.

Bench testing is a method for validating whether there are any problems with the starter motor. It involves removing or unbolting the motor from under the hood. Here are proper procedures for bench testing a starter motor.

• Remove the Starter Motor

How do you test a starter motor on a test bench?

–           Start with disassembly.

–          Disconnect all the starter motor wires.

–          Unbolt the motor from the engine block.

–          Be sure to label all the wires so you can reconnect them correctly during reassembly.

–          Consulting your owner’s manual will also be helpful to avoid getting lost during the process.

• Connect the Jumper Cables

The next step is to connect jumper cables to the starter motor. Find a red jumper cable, connect one end to the positive terminal of the battery and the other to the solenoid. Then, connect a black jumper cable to the negative terminal of the battery, while the other end is hooked into the starter motor’s lug on the main cylinder.

Tools for Testing a Starter Motor

–          A multimeter

–          Jumper cables

–          A set of wrench and screwdrivers.

–          A fully charged battery.

–          Gloves and goggles for safety.

COMMON CAUSES OF FAILURE

Now that you know how to check if the starter motor is faulty, you may also be interested in characterizing the common causes of failure. Like a car battery, typically replaced every three to five years, a starter motor also has an expected lifespan of 100,000 to 150,000 miles. However, these components don’t fail solely due to wear and tear.

Here are some other reasons why a starter motor might suddenly fail.

1.EXPOSURE TO THE ELEMENTS

All car parts are expected to function properly under ideal conditions. Exposure to elements such as water and dirt could lead to corrosion and premature deterioration of metal parts. Water can short-circuit electrical components and remove protective lubrication, while dirt can cause corrosion and rust.

2. EXPOSURE TO EXTREME CONDITIONS.

Automotive components are expected to function under specific conditions and pressures. However, constant exposure to extreme heat or cold can cause starter motor and battery components to wear out much faster. It is important to follow regular and safe driving conditions to avoid excessively exposing the vulnerabilities of its components.

3. INCORRECT AND BAD INSTALLATION OF STARTER MOTOR

Regular maintenance is essential to extend the lifespan of a part or the whole of a car. This maintenance includes the correct installation of critical components such as electrical devices. Any misplacement or misalignment in simple connections can cause failure in the component.

TIPS FOR EXTENDING STARTER MOTOR LIFESPAN

TIP 1: Do not do repeated short starts

Tip 2: Ensure that your battery is in good condition.

Tip 3: Do regular car maintenance.

Tip 4: If you notice any car problem, fix it on time.

COST FOR REPLACING A STARTER

If you have a bad starter, you have the option of repairing it or replacing it. If you wish to replace it, here is what it will cost you.

–          The cost of replacing parts of starters: $75 -$350

–          Cost of labour: $150-$220

–          A total estimate: $200-$220.

Note: This cost varies, depending on the model of car and your location.

FREQUENTLY ASKED QUESTION

1.     How long does a starter motor last?

A starter motor lasts between 120,000 to 150,000 miles.

2.     Will my car start with a bad starter?

This depends on the type of car. For automatic cars, it cannot start, but for manual cars, you may push it to start.

3.     What will it cost to fix a starter motor?

It cost between $200- $550.

Conclusion

The starter motor is a simple component of your car. It plays an important role in whether your car starts or not. Knowing how to test a starter motor demonstrates critical knowledge and skill should you encounter ignition problems. It is essential to learn how to check your car’s starter to diagnose any related problems that may arise. But most importantly, make sure you maintain your car to prevent these kinds of problems in the first place. Although checking starters can be an easy DIY task, it does not hurt to take extra precautions. When unsure, consult a trusted mechanic.

Read also:Throttle Position Sensor Symptoms

Have you ever pressed your accelerator but your car wouldn’t just respond the way it is expected to? That situation can be disturbing. The throttle position sensor is an important component in your car engine. This component monitors how open the throttle valve is depending on how much pressure is applied on the accelerator pedal. It controls how much air flows into the intake manifold, found in the engine. The engine control module, transmits how fast the throttle positions closes and open. The accelerator pedal sensor transmits the position of the accelerator pedal to the engine control unit (ECU). This information allows the ECU to determine the amount of acceleration the driver applies. When this sensor does not act as it should, it can affect the performance of car and even its fuel economy.  This page explains the operating principle of modern accelerator pedal sensors and the symptoms that indicate a sensor malfunction. You will also learn how to have accelerator pedal sensors checked in a workshop.

AN OVERVIEW OF THE THROTTLE POSITION SENSOR

The throttle position sensor is an essential component that informs the ECU about the precise opening of the throttle plate, allowing for accurate adjustment of the air-fuel mixture. In modern drive-by-wire systems, this sensor becomes even more critical, ensuring agile response and optimal fuel metering from the very first millisecond.

From its beginnings as an external and easily replaceable device, the throttle position sensor has evolved into designs integrated into the electronic throttle body, eliminating additional moving parts. This transition, driven since the 2000s by manufacturers such as Toyota and BMW, aims to improve the reliability and signal synchronization of next-generation injection systems.

You can find the throttle position sensor, mounted in the body of the throttle. It sends data to the ECU to adjust integral things like the fuel injection, ignition timing and air intake. Your car performs well, when this sensor is good.

 Operating Principle of the Throttle Position Sensor

Accelerator Pedal Sensor: Operation

In modern vehicles, the proportion of electronic components is constantly increasing. This is due, among other reasons, to legal regulations, e.g., those related to reducing fuel consumption and emissions. Electronic components are also being used more and more to improve active and passive safety, as well as driving comfort. Among these components, the accelerator pedal sensor is a notable example.

For use in automobiles, contactless sensors, which operate on an inductive principle, are becoming increasingly common. This sensor consists of a stator, which includes an excitation coil, receiving coils, and evaluation electronics, and a rotor, formed by one or more closed loops with a specific geometry.

Applying an alternating voltage to the transmitting coil generates a magnetic field that induces a voltage in the receiving coils. The electronics process and evaluate these amplitudes, which are then sent as a direct current voltage to the control unit. The control unit evaluates the signal and transmits the corresponding pulse, e.g., to the throttle valve regulator. The properties of the voltage signal depend on the accelerator pedal position.

The Most Common Symptoms of Throttle Position Sensor

1. The Check Engine Light is One

This is the most common symptoms of a bad Throttle Sensor. It may indicate these common error codes; P0120, P0122 and P0121. Whenever you see any of these codes, you should know that there is an issue with the readings of your throttle sensor.

2.Slow Response to Acceleration

A slow response to acceleration is an indication that your car’s throttle position sensor is bad. In this instance, you will notice; weak acceleration, or even difficulty in overtaking another car.

In the event of a bad accelerator pedal sensor, some of the following symptoms may also appear:

• The engine only shows an increase in idle speed.
• The vehicle does not respond to accelerator pedal movements.
• The vehicle goes into “limp mode.”
• The check engine light illuminates.

3.Struggling to Change Gears

Gears are important in any car, be it manual or automatic. The Throttle Position sensor helps to control shifts in gears. But this is difficult in a bad sensor. If your sensor is bad, you will experience, delay in changing gears and transmission issues.

4. Low Fuel Economy

A bad position sensor can cause low fuel economy. In this case you may notice; reduced fuel mileage and bad engine performance.

5. Jerking While in Motion

If you notice sudden jerks while driving and a random change in acceleration, then you need to check your throttle position sensor.

Why the Throttle Position Sensor Fails

A malfunction can be caused by one of the following:

• Damaged connections or wiring at the accelerator pedal sensor.
• Lack of power and ground connection

Faulty evaluation electronics in the sensor

Build-up of dirts and carbon.

Using poor quality sensors for replacement.

Troubleshooting

• Accelerator Pedal Sensor Inspection

During troubleshooting, the following steps should be considered:

Read fault codes

• Visually inspect the accelerator pedal sensor for mechanical damage
• Visually inspect all relevant electrical connections and wiring to ensure they are secure and undamaged
• Test the sensor using an oscilloscope and a multimeter

Using a Mercedes-Benz A-Class (150) 1.7 as an example, the following describes all the troubleshooting steps, technical data, and illustrations to explain the fault location process.

Diagnose a Bad Throttle Position Sensor, how?

The following are confirmed ways for diagnosing a bad throttle position sensor:

1. Use a Multmeter

This multimeter is used for measuring voltage changes when the throttle is in motion.

2. Carry out a Visual Inspection

Visually inspect the sensor. Look out for bad or disconnected wires.

3. Use an OBD-II Scanner

Use an OBD-II Scanner to check for any error codes relating to the throttle position sensor.

Step-By-Step Methods of Fixing a Bad Throttle Position Sensor

1. First, clean dirts and carbon buildup on the sensor.
2. Next, use a quality brand of throttle body cleaner to do a thorough clean up on it.

Sometimes, simply cleaning the position sensor may be all it needs to function properly again. But if the symptoms persist even after cleaning, consider replacing the sensor.

How to Replace a Bad Throttle Position Sensor

1. First, carefully disconnect the battery.
2. Second, remove the bad sensor.
3. Third, gently replace the new sensor
4. Finally, if necessary, calibrate the new sensor.

The Cost of Replacing a Throttle Position Sensor

The cost of replacing a throttle position sensor, depends on a number of factors, like the quality of sensor you want to use, the location and the labor cost. However, here is a typical estimated cost:

• Cost of sensor parts around, $25 -$200
• Cost of labour is about $65 -$150.

If you wish to do the replacement yourself, then, you will also need to include the cost of tools to use. You will need tools like a socket set and a screw driver.

Practical Maintenance Tips the Throttle Position Sensor

Maintenance always saves you money and time. Follow these practical tips to maintain your position sensor:

• Regularly clean the body parts of your throttle.
• Check the connections and wires.
• Only use good quality sensors when your throttle sensor is due for replacement.
• Do a periodic test to see how your throttle position sensor is doing. You may need a multimeter or an OBD-II scanner.

Frequently Asked Questions

1. Will I see error codes if my Throttle position sensor is bad?

Yes, you will. Error codes like P0121 and P0123 may be evident.

2. What happens if my position sensor is bad?

Poor fuel economy, sudden jerks while moving, and slow response to acceleration are common happening you would experience if your sensor is bad.

3. How do I clean my throttle sensor?

For thorough cleaning, use a good brand of throttle body cleaner.

4. Is replacing a bad position sensor easy?

Yes, with the right tools, you can easily do it.

5. How much does it cost to replace a bad throttle position sensor?

Around $150 -$250 for the sensor parts and labour cost.

6. What commonly causes a throttle position sensor to fail?

Accumulation of dirt, carbon build-up and faulty connections are a few things that can cause it to fail.

7.Can I replace a bad throttle position sensor myself?

Yes, you can easily replace it yourself, if you have the right tools.

Read also: Engine Oil Pressure Sensor

Conclusion

Conclusively, at a simple glance, the throttle position sensor may appear as a small and insignificant component of the engine. But, as you have seen from this article, it plays a significant role in making sure that your car is safe for use and its engine performs well. Some common symptoms of bad throttle position sensor include, slow response to acceleration, poor fuel economy and sudden jerks or surge while the car is in motion. Thankfully, both fixing and replacing a bad throttle position sensor is not so expensive. To fix a bad position sensor, you can simply clean the sensor or check the wiring for any disconnections. To replace a bad position sensor, first, remove your battery, disconnect wires and replace the throttle sensor with a new one. If you are already noticing any of the symptoms discussed in this article, do not wait till it get worse. Consult a trusted mechanic.

Also read:https://www.ctscorp.com/Products/Position-Sensors/Throttle-Position-Sensors

You are driving and you suddenly pull up to a stop sign but your car shakes when you brake. What can you do? Why does your car shake when you apply brakes? Do not be disturbed. Car shaking when braking is commonly due to worn-out brake rotors or worn-out brake pads. Brake vibration in cars is the vibration felt through the steering wheel and suspension when the brakes are applied at certain pressures and speeds. This shake can range from a barely noticeable to a more serious shake. While this is a serious issue in cars, it can be solved. In this article, we will preview the main causes of car shaking when braking and possible solutions and the cost of fixing this problem. .

CAUSES AND SOLUTIONS OF SHAKE DURING BRAKING

Shaking when braking is a major sign of bad brake rotors and pads. Other causes include, tire misalignment and overheating. The solutions to these problems are practical. They include properly aligning common causes of this problem are:

CAUSE 1: HUB BEARING OR DISC MISALIGNMENT

Shaking when braking is caused by a poorly adjusted brake disc that is misaligned with the hub bearing or caliper.

To help you identify if this is the case, here are some symptoms and solutions:

Check for rust or dirt on the hub bearing surface.

WHY? Rust or dirt causes poor contact between the disc and the hub bearing.

SOLUTION

1.     Remove the disc and clean both surfaces to remove rust and other contaminants.

Check for warping of the hub bearing contact surface due to excessive torque.

WHY? Using too high a torque on the positioning screw causes vibration during brake application.

2.     Replace the discs and avoid excessive torque.

Check for hub bearing deformation

WHY? Although rare, it is possible for bearings to become deformed. Bolting a disc to a deformed hub will always cause brake vibration. The same will occur if rust is not removed from the hub bearing surface before installing the disc.

3.     After installing a disc, always check the disc’s centering with a measuring instrument. If the run out is out of tolerance, reposition the disc in an alternative location until the run out is within tolerance. If the run out remains out of tolerance, the hub bearing must be serviced.

4.     Check if alloy wheels are mounted correctly

WHY?

A common cause of disc runout in recent years is the incorrect mounting of “one-size-fits-all” alloy wheels. Because the same wheel is used for multiple hub types and sizes, installers are using locating spacers on the wheel studs. If the spacer is lost or damaged, the wheel cannot be centered correctly.

5.     Place the centering gauge on the back of the disc while fitting the wheel and measure the runout. The gauge will only show the runout once the wheel is fitted and adjusted, and the wheel may need to be replaced.

CAUSE 2: OVERHEATING AND SEVERE DISC WARPING

Any significant temperature increase can cause the disc metal to warp in different areas. These “hot spots” cause intermittent contact between the brake pad and the disc, resulting in vibration. To help you identify if this is the case, here are some symptoms and solutions:

 Check for Signs of Brake Abuse

WHY? Brake abuse is the most common reason for overheating. Discs are designed to cool quickly between braking applications. But when brakes are applied intensely in rapid succession, for example, during mountain driving, the discs don’t have enough time to dissipate the heat.

THE SOLUTIONS:

1.     Blue spots on the disc surface are a good indication of overheating. Discs that show blue spots or a darker color in some areas cannot be salvaged and MUST ALWAYS be replaced, along with the brake pads.

Check the quality of your brake pads.

WHY? Poor-quality brake pads can overheat very easily, especially during hard braking. Excessive heat from the pads can cause the rotors to overheat, leading to warping.

2.     Again, look for blue spots on the rotor surface. If none are found, inform the driver about the risks of using low-quality pads. ALWAYS replace brake pads and rotors when blue spots are visible on the rotor.

CAUSE 3: DISC THICKNESS VARIATION (DTV)

DTV is the variation in the thickness of the rotor surface. For effective braking, the rotor must have the same thickness across its entire surface. If there is an uneven friction surface, the brake pad will slip and regain contact with the rotor as it rotates. This causes brake judder. To help you identify if this is the case, here are some symptoms and solutions:

Check with the driver to see if the brakes have been properly bedded in.

WHY? To get the best performance from your brakes, it’s essential to follow the bedding-in procedure. By applying only moderate pressure to the brake pedal during the first few applications, an even layer of friction material is transferred from the pads to the disc. Properly bedding in the surfaces improves safety and prevents vibrations associated with brake disc vibration (DTV).

The Solution

 Prevent The Problem

Prevention is better than cure. Whenever you install new brake pads, avoid hard braking for the first 200 km (125 miles). When improper bedding has resulted in slight brake disc vibration, re-batting the brakes may be sufficient. If this doesn’t realign the disc surfaces, the only solution is to replace the brake pads and discs.

Check if the caliper is stuck.

WHY? A stuck caliper piston or caliper sliding pin causes uneven forces to be applied to each side of the brake disc, creating uneven wear, or DTV.

2.     This problem is usually caused by rust or dirt. Therefore, proper maintenance of the stuck caliper is necessary to prevent the problem from recurring, and both the brake pads and discs should be replaced.
3.     Check for dirt or corrosion on the disc surface.

WHY? During braking, some of the friction material from the brake pads is transferred to the disc. But with lower-quality brake pads, deposits of friction material can adhere to the disc unevenly, changing the disc’s thickness and parallelism.

4.     If the DTV is minimal, removing the deposits with a brush or sandpaper and testing the brakes on the road may be sufficient. If this hasn’t realigned the surfaces, the only solution is to replace the pads and rotors.

Check for pad marks on the rotors.

WHY? If you keep the brake pedal pressed when the brakes overheat, pad material can become imprinted or welded onto the rotors. This will often be visible as the outline of a brake pad on the rotor surface.

5.     Removing the pad mark with a brush or sandpaper should be sufficient.
6. Check for brake pad marks on the discs.

WHY? If you keep the brake pedal pressed when the brakes overheat, brake pad material can become imprinted or welded onto the discs. This imprint will often be visible as the outline of a brake pad on the disc surface.

7.     Removing the pad mark with a brush or sandpaper should be sufficient.

WAYS TO PREVENT YOUR CAR FROM SHAKING WHEN BRAKING

The following are practical ways to prevent your car from shaking when braking:

1.     Ensure that your rotors remain flat and maintain a smooth surface.
2.     Install new brake pads, when your brake pads get worn out.
3.     Damaged brake calipers result in uneven pressure in the braking system. Hence, check your brake calipers, and change it when you notice a damage.
4.     Drive carefully. Braking hard frequently can cause shaking in your braking system, eventually.
5.     Regularly go for tire alignment and balance.
6.     See a trusted mechanic for inspection.

HOW MUCH DOES IT COST TO FIX BRAKE SHAKE?

The cost of fixing brake shake in a car, depends on the component of the braking system that is faulty. For example, for:

–          Brake rotors – $350-$600

–          Brake pads – $400-$700

–          Tire alignment: $65 – $200 (for all 4 tires)

Note: The cost includes labour.

Average cost ranges from $200 – to $1,200.

FREQUENTLY ASKED QUESTIONS

1.     If my car shakes when braking, when should I see a mechanic?

You should see a mechanic when the shakes are persistent, you perceive a burning smell when braking or when you notice that your brake is no longer effective.

2.     Can bad tires cause shaking?

Certainly, bad tires can cause shaking when braking.

3.     How much does it cost to fix brake vibration in my car?

Typically, to fix brake vibration in cars, is between $200 to $1,000 or more including cost of labor.

4.     Can I drive when my car shakes?

Simple answer, no. It is not recommended to drive if your car shakes when driving.

5.  Why does my steering wheel shake when I brake at high speed?

Improper alignment of tire and suspension issues can cause car vibrations.

Read also: How to Clean a Catalytic Converter Safely and Effectively

CONCLUSION

Car vibration when braking is usually a sign that your brake rotor, pads or other components in the braking system may be faulty. To prevent your car from shaking, drive carefully, ensure that your tires are balanced and aligned, and replace worn out suspension components. To fix this problem, replace worn out brake pads or callipers and resurface or replace bad brake rotors. Whether the shake is minor or serious, see a trusted mechanic to check your car’s braking system.

Also read: https://bullet-automotive.com/is-your-car-shaking-when-you-brake-heres-why/