Reasons Why Car Won’t Go Over 20mph

Reasons Why Car Won’t Go Over 20mph

It can be extremely annoying if your car refuses to go over 20mph. It won’t accelerate no matter how hard you stomp on the gas pedal.

Car WonGÇÖt Go Over 20mph GÇô Causes

Whether your car is not accelerating at all or won’t go over a certain speed, you need to find out the cause.

Reasons Why Your Car Won’t Go Over 20mph

Weak Fuel Pump

The fuel pump delivers fuel from the gas tank to the engine. When the fuel pump is damaged, fails, or overheats, it may become impossible for fuel to get to your engine.

When enough fuel doesn’t get to the engine, your car may not go over 20mph.

Engine sputtering, a whining noise from the fuel tank, or loss of power under load are common symptoms of a weak fuel pump.

Failed Clutch

When your car refuses to go over 20mph, it could be a damaged clutch.

Your clutch will not engage the engine with the transmission fluid causing your car to lose acceleration.

Another type of failure is when the clutch fluid is below the minimum level. The clutch fluid should always be slightly below the maximum level.

Avoid filling to the brim and ensure no spillage. When your clutch pedal feels soft as you press it to the floor, your clutch fluid may be too low.

Electronic Control Unit Malfunction

The ECU is also called the brain of the car, and it processes information from multiple sensors.

When the ECU malfunctions, your car won’t go over 20mph when you press the gas pedal.

One of the causes that can make your ECU malfunction is a short circuit in the components or wiring.

The vibrations that the cars’ ECU have to endure for long can also cause malfunction. The bond or the connecting wires are most affected.

Depending on where the ECU is located, temperature changes can cause malfunction.

Some ECUs are located in the bonnet, where extremely high temperatures can happen, and heat will often weaken the wires.

Timing Belt Not Working Properly

Your car’s timing belt plays a vital part in increasing acceleration when you hit the gas pedal. The timing belt is linked to the camshaft and the crankshaft needed to operate the engine.

Apart from the engine, the timing belt will also take part in the operation of the water pump and the oil pump.

A worn-out or damaged timing belt can affect your acceleration. But even a brand new timing belt that’s misaligned may cause your car not to go over 20mph.

Faulty Catalytic Converter

A catalytic converter is found between the engine and the tailpipe. Its primary function is to break down exhaust emissions.

The “cat,” as popularly known, can be damaged by overheating, running over a curb, or road debris.

The catalytic converter can also become contaminated or clogged.

Dirty Components

Various components must work together for your car to run smoothly. When one part or component accumulates dirt, it may affect the whole system.

Dirty spark plugs and coils, when clogged by dirt, can cause misfiring. And excessive misfiring often causes acceleration issues.

Car WonGÇÖt Go Over 20mph

The fuel filter keeps dirt, which can build up in your gas tank, out of your engine. The accumulated dirt in the fuel filter may prevent fuel from circulating, making your cat not go over 20mph.

When you have a dirty mass airflow sensor or oxygen sensor, it will affect the reading in the engine.

The oxygen sensor communicates how much fuel is used to the engine computer unit. Incorrect reading will cause your engine to use too little or too much fuel.

An air filter is vital for proper fuel combustion. It is nearly impossible for air to flow to the rest of the system when the air filter is clogged.

A dirty or clogged fuel injector can also cause poor fuel flow as its role is to inject fuel into the engine. This can result in your car not going over 20mph.

What To Do If Your Car Won’t Go Over 20mph?

Let’s take a look at some of the solutions for the above issues.

Make Your Clutch Last Longer

When your clutch is well maintained, you will have no problem with acceleration. High levels of heat can cause damage to the clutch, and you need to reduce heat due to friction.

It is also advisable to remove the air out of the clutch fluid. But the best thing is to replace the clutch fluid with a new one.

Repair The Electronic Control Unit

The only solution for investigating your ECU malfunction is to take it to the workshop for testing.

If any issues are detected, it will typically be repaired or replaced depending on the extent of the damage.

Take Care Of The Timing Belt

Replace the timing belt when the need arises. Because it is a sensitive part, you may need to take it to a professional.

Replace The Fuel Pump

There is no way your car will accelerate if fuel is not getting to the engine or if the flow is restricted. You may suddenly have a car that won’t go over 20mph.

Make sure to keep your fuel pump in good working condition. Replace it once it gets damaged.

Address The Catalytic Converter Issues

Your car’s catalytic converter can last for more than ten years. But, you don’t have to wait for the maintenance schedule to have a check.

Your car not going over 20mph could be one of the indicators that your catalytic converter has a problem.

Keep your combustion systems, emissions, and exhaust in regular check to avoid this problem.

Cleaning Or Replacing Dirty Parts

Don’t undertake cleaning or replacing any dirty part or component unless you know how to. One of the components mentioned in your car manual is an air filter and when to replace it.

You can add a cleaning additive to your fuel injector in the gas tank when you want to fix your dirty fuel injector. A fuel filter is a component that you can easily clean or replace by yourself.