Do you have a car that won’t go over 20 mph, no matter how hard you step on the gas pedal? It can be incredibly frustrating, especially if you are trying to get onto a freeway or pass someone on the road. There can be potential reasons for this issue, but how could you resolve it when you won’t read further?
The reason could be a problem with the fuel system, the transmission, or the engine. A faulty oxygen sensor can cause the engine to run too rich, losing power. The most common reason is that the vehicle has a governor, which is a device that limits the top speed. It can also illuminate the check engine light.
Now that you’ve known the reasons let’s get into further details. This article will explore some of the most common reasons why a car won’t exceed 20 mph and what you can do to fix the problem.
Common Causes Of Cars That Won’t Go Over 20 Mph
We all know the feeling. You’re driving along, minding your own business, when suddenly, your car won’t go over 20 mph. It’s frustrating and scary if you’re unsure what’s causing it. Cars won’t go over 20 mph for a few common reasons. If you’re experiencing this problem, check for these issues!
Minimal Issues
Some minimal issues can trouble your cars reaching higher speeds. These are listed below, along with their solutions:
Bad Gas
If the gas you’re using is old or of poor quality, it can cause your car to run slower than usual. The solution is to use fresh, higher-quality gasoline simply.
High Altitude
If you live in an area with a high altitude, the air is thinner and contains less oxygen. It can cause your car to run slower than normal. The solution is to install a carburetor jet insert to help your engine get the oxygen it needs to run properly.
Engaged Emergency Brake
The emergency brake can sometimes get stuck in the engaged position, which will prevent your car from going over 20 mph. The solution is to check the emergency brake and ensure it’s not engaged.
Things Under The Gas Pedal
If there are any objects under the gas pedal, they can prevent it from being depressing. It will limit the amount of gas tank reaching the engine, and as a result, your car’s speed will be limited. The solution is to remove any objects blocking the gas pedal simply.
Needs Cleaning/Maintenance
If your car requires a tune-up or cleaning, it can run slower than normal. The solution is to take your car in for a tune-up or have someone clean the carburetor. Other maintenance areas include the following.
Faulty Oxygen Sensor
A faulty oxygen sensor can cause your car to run slower than normal. It can send wrong signals to the car’s monitoring system, which can cause problems. The solution is to replace the oxygen sensor.
Clogged Fuel Filter
A clogged fuel filter can also reduce the speed of your car. It is because of the lack of maintenance and dust particles clogged in the filter. The solution is to replace the fuel filter.
Clogged Air Filter
A clogged air filter does not let the air pass properly and disrupts the air-fuel ratio, which ultimately doesn’t let the fuel burn. The engine cannot produce enough spark and can cause your car to run slower than normal. The solution is to replace the air filter.
Dirty Spark Plug Or Wiring
Over time, spark plugs can become fouled with debris and deposits. It can cause them to misfire, resulting in a loss of power. You should consider changing the spark plugs.
There could be an issue with your car wires. Over time, these can become worn out and no longer function properly. Check to see if your wires are intact.
Faulty/Clogged Mass Air Flow Sensor
If your car engine is taking time to start or it gets it stalls shortly after starting. You also feel jerks while accelerating the car; your engine needs maintenance because the airflow sensor has gone faulty. The immediate solution is to call a mechanic to sort your clogged airflow sensor.
Dirty Fuel Injector
A dirty fuel injector can cause your car to lose power and not go over 20 mph. To clean your fuel injector, you’ll need to remove it and disassemble it. Then, using a brush and some cleaning solvent, clean the inside of the injector. Reassemble the injector and reinstall it.
Malfunctions
One of the most frustrating driving things is when your car won’t go over 20 mph. It’s especially frustrating if you’re trying to get somewhere quickly and suddenly your car parts malfunction.
Malfunctioning of any car part can cause this problem, so if you’re experiencing it, here are a few things to check.
Crank Sensor
A crank sensor measures the crankshaft’s position and signals the ignition system. If the sensor is damaged or not working properly, it can cause your car to lose power and not go over 20 mph. You’ll need to remove it and install a new one for an easy solution.
Faulty Catalytic Converter
A catalytic converter helps to convert exhaust fumes into less harmful gases. If you observe any faulty symptoms, it’s probably because the changing limit has been reached. It can affect the speed of your car. To replace the converter, you’ll need to talk to a mechanic first.
TPS Malfunction
The throttle position sensor (TPS) measures the position of the throttle body and sends a signal to the engine control unit (ECU). Any malfunction in this area can mess up the car’s overall performance and speed. The best solution is to buy a new one.
Timing Belt
The timing belt is responsible for keeping the engine’s valves in sync with the pistons, and if it breaks or slips, the engine will misfire and won’t be able to run at full speed. If you suspect that your timing belt may be the problem, it’s essential to have it checked by a mechanic as soon as possible.
Engaged “Limp Mode”
Limp mode is a safety feature that kicks in when the engine senses a problem. When engaged, the limp home mode will limit the car to a maximum speed of 20 mph to prevent further damage. Several things can trigger limp mode, so if you’re experiencing it, don’t forget to have your car checked.
ECU Problems
The ECU, or engine control unit, manages the engine’s fuel mixture and ignition timing. If it isn’t working properly, the engine will run rough and won’t be able to achieve full speed. ECU problems can often be fixed with a software update, so if you suspect your ECU may be the issue, it’s worth taking it to your car dealership to check it out.
Problem With Compression
The compression in an engine allows it to run, and if there’s a problem with the compression, the engine cannot run at full speed. Various things, such as a blown head gasket or a damaged piston can cause it. If you see the symptoms, get them fixed ASAP!
Faulty Clutch
If the clutch is not working properly, it can cause the car to stall or jerk when you try to accelerate. It can be a dangerous problem, so it’s essential to have it checked by a mechanic if you think your clutch may be the issue.
Faulty Transmission Sensor
Most modern cars have a sensor that tells the transmission when to shift gears. If it is malfunctioning, the transmission may not shift correctly, and the car will be stuck in one gear. It can result in reduced car speed. It is wise to catch the fault in the early state to have it fixed without any major loss.
These are just a few potential reasons your car may have trouble reaching higher speeds. If you’re still having trouble after trying the solutions listed above, try seeking help from the car maintenance shops.
Is Driving Too Slow Dangerous?
You might be surprised to learn that speeding too slowly can be as dangerous as speeding. While it might not seem like driving a few miles below the speed limit could do much harm, it can lead to serious road problems.
Driving too slowly can cause other drivers to become impatient and try to pass you. It can lead to accidents, especially if they’re not paying attention and sideswipe your car.
It can also make merging onto the highway or turning difficult since other drivers expect you to go faster. If you suddenly have to brake or swerve, it could cause an accident.
Additionally, driving too slowly can reduce your gas mileage and overheat your car. Your engine has to work harder when you’re going slower, which uses more gas and causes the engine to overheat.
So next time you’re on the road, keep an eye on your speedometer and avoid driving too slowly. You’re safe by following the posted speed limit, but driving a few miles below the limit can be dangerous.
Check Out Driving Too Slow | How Slow Drivers Increase the Risk of Accidents:
When To Ask For Professional Help?
If your car starts to have trouble going over 20 mph, it’s time to take it to a professional. Only a professional will be able to diagnose and fix the issue. However, some of the issues you can troubleshoot on your own are listed above. Always make sure there is no debris or buildup in your car parts. It can prevent your car from reaching its full potential if there is.
FAQs
Is It Bad to Floor a Car?
No, it’s not bad to floor your car. However, doing it too often may eventually damage your car’s engine or transmission. If you’re constantly flooring your car, you’re also likely to experience decreased gas mileage and increased wear and tear on your tires. So while there’s nothing wrong with occasionally hitting the gas pedal to the floor, it’s best not to make a habit.
How Can You Get Your Car to Accelerate Faster?
To make your car accelerate faster, do the following things:
– Check the obvious things like the gas pedal and the accelerator cable. If they seem to be working properly, the problem is probably with the engine itself.
– Also, check the tires, plugs, and wires. If they are old or worn, replace them as well.
– Finally, ensure all hoses and belts are in good condition and not leaking.
Which Is Not A Step To Take If Your Gas Pedal Gets Stuck?
If your gas pedal gets stuck, the first thing you should do is try to push it down with your foot. If that doesn’t work, you should use your hand to push the pedal down. If that still doesn’t work, you should use a tool to pry the pedal up. If all of those methods fail, you should call a tow truck.
What Should You Avoid Doing If Your Accelerator Gets Stuck?
Accelerator pedals can get stuck for various reasons, the most common being floor mats tangled up underneath. If your accelerator pedal suddenly gets stuck, avoid doing the following:
– Do not pump the pedal-this will only make the problem worse
– Do not try to override the pedal with your foot-this can cause you to lose control of the car
– Do not turn off the engine-this will disable power steering and brakes, making it harder to control the car
If possible, put the car in neutral and coast to a stop. Once the vehicle is stopped, turn off the engine and call a tow truck or roadside assistance.
If you are in this situation, remain calm and follow the above steps. Trying to pump the pedal or override it with your foot can cause you to lose control of the car, leading to a severe accident.
Final Thoughts
When your car doesn’t go over 20 mph, always check to see any obvious signs of damage or malfunctioning parts. You can take your car to a mechanic to check it out or try troubleshooting the problem yourself. Whichever route you choose, stay safe and take your time. You’ll be back on the road with patience and perseverance.
