Updated at: 13-08-2022 - By: Lucas

What kind of vehicle has a tendency to over-rev? This is a common problem for many drivers, and it may be extremely aggravating.

If you’re having trouble starting your car, you may have a damaged ignition or spark plugs!

In addition to uncontrollable revving caused by faulty gasoline lines or fuel pumps, your automobile may also be experiencing an electrical problem if it requires more electricity than a malfunctioning alternator or battery can deliver.

We’ll go over the probable causes of this problem and how to fix it in this article. Don’t freak out if your car starts revving on its own. Your problem is our problem, and we will assist you find a solution.

What Is Revving?

Without pushing the gas pedal, your car’s engine will begin revving. When you’re in the middle of driving, this can be downright terrifying. It is possible for your car to start revving on its own for a variety of reasons, and we’ll go over each of them below.

What Causes My Car To Rev On Its Own?

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It is possible for your car to start revving on its own for a number of different reasons. Listed here are a few of the most typical reasons for the problem:

Faulty ignition system

A defective ignition system is one possibility for why your car is revving excessively. You may notice a revving engine if the spark plugs aren’t performing properly.

Bad fuel line

A faulty gasoline line might also result in excessive revving. A malfunctioning gasoline line can cause the engine to rev up and down without your input, resulting in an uncontrollable vehicle.

Fuel pump problems

If your automobile revs up on its own, you may have a problem with the gasoline pump.

There will be noises beneath the hood that sound like someone continually beating on something metal (this might just as easily signify that there is another problem with your vehicle) at regular intervals.

How Do I Stop My Car From Revving On Its Own?

Why Is My Car Revving On Its Own

If your car is revving excessively, there are a number of things you may do to remedy it. To name just a few options, consider the following:

Check the spark plugs

Ignition malfunctions are a typical culprit in revving. By inspecting the spark plugs, you can see if this is the problem. A dirty or carbon-covered spark plug could cause your engine to misfire and start revving if they’re not sparking correctly.

Check the fuel line

Another common cause of your car revving up on its own is a faulty gasoline line. The fuel line can typically be replaced to resolve this problem.

Replace the fuel pump

The gasoline pump can be replaced if you suspect it is causing your car’s difficulties. Despite the fact that the gasoline pump is made up of numerous pieces, everything works together seamlessly when everything else is in functioning order.

There may be a problem with your engine if you still have revving issues after changing your spark plugs and fuel filter. Under the hood of your car, look for any coolant or oil leaks that can indicate a problem.

Unless there are any obvious evidence of coolant leakage on top of the engine block, there is a fair possibility that something inside the engine has gone awry!

What Are The Symptoms Of A Revving Issue?

There are a variety of symptoms that might be caused by this problem. Here are a few of the most frequently encountered:


Misfiring is a common symptom of a revving problem. Your automobile will lose power and slow down as it battles against gravity if the engine doesn’t fire at all (and other forces).


Having an inconsistent idle speed is another symptom that your car’s fuel system or engine is in need of repair or replacement.

How Do I Prevent My Car From Revving On Its Own?

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If you want to avoid this in the future, there are a number of options available. Here are a few suggestions on how to avoid it:

Check spark plugs regularly

If you don’t check your spark plugs periodically to make sure they aren’t dusty or covered with carbon deposits, you could end up with an engine that revs itself.

Change fuel filter regularly

Periodic replacement of the gasoline filter is also advised because it can become clogged and cause problems if not done correctly.

Replace oil when necessary

Depending on how much driving you do each day, you may require an oil change every three months or so (more than 500 miles per day means that your oil needs to change sooner rather than later). Preventing problems like revving in the future will help keep everything functioning smoothly.

Why Does My Car Rev On Its Own While Driving?

When you’re driving, your car’s engine can be revving for a variety of reasons. A fault with the fuel system or the engine itself could be to blame.

If you’re experiencing this issue, you should take your vehicle to a repair right away so that the problem may be properly examined and remedied.

Additional Problems

Idle Control Valve

To help keep the engine at a steady pace, the idle control valve opens and closes as needed. Your automobile will continue to rev even if you release the gas pedal if this valve is stuck open.

EGR Valve

In order to lower emissions, the EGR valve (exhaust gas recirculation) helps by recycling some of the exhaust gas back into the engine. You may notice that your automobile revs up on its own if this valve is clogged or faulty, as not enough air is entering the combustion chamber.

Throttle Position Sensor

The ECU receives data from the throttle position sensor about how far down you’ve pushed the accelerator pedal (engine control unit). This sensor can malfunction and cause the engine to rev without the driver’s input.

Fuel Injectors

The fuel injectors are in charge of delivering precisely the right amount of gasoline to each cylinder at precisely the right moment and pressure to initiate combustion (which powers your car).

Over time, these become blocked up with dirt and debris, reducing the amount of gas and air mixed together, which reduces the amount of power produced by each engine stroke.

Oxygen Sensor

Exhaust gases exit through an open window during operation, and the oxygen sensor analyzes how much unburned oxygen remains. When you let off the gas pedal, if there isn’t enough of it left, your automobile may start up again without your involvement.

Problem With Transmission

Transmission difficulties might cause your automobile to rev even if you don’t press the accelerator pedal. Could be due to a defective sensor or some other problem with the system.

Even if you’re not driving, a faulty battery can produce high RPMs because it doesn’t have enough power to supply all of the components in the engine compartment, so they’re overworking themselves to compensate!

How To Diagnose Transmission Problems?

You need to take your car to a mechanic if it starts revving up on its own. It’s best to leave it to a specialist to figure out what’s going on, as there are numerous possibilities.

Transmission difficulties can be identified in a variety of ways, some of which are listed below.

Road testing

Test-driving the vehicle is a necessary step in the buying process. This is the perfect moment for the mechanic to be on the lookout for any unusual symptoms or issues.

Visual inspection

The mechanic will carefully inspect each component of the transmission system to look for any evident problems.

Removal and disassembly

Some transmission problems can only be seen from the inside, therefore the mechanic may opt to disassemble the transmission and examine each component individually.


In order to identify if the transmission is working well or not, many tests can be carried out. Pressure testing, leak testing, and electrical testing are examples of this type of testing.

Why Does My Automatic Jerk When Changing Gears?

The sooner you get your car checked out if you notice a jerking sensation when shifting gears, the better. It’s better to leave it to a mechanic to figure out what’s causing this issue, as there are numerous possibilities.

When shifting gears, an automatic car may jolt for a variety of reasons.

Faulty transmission sensor

One of the most prevalent causes of an automatic jerk in a vehicle is this. Because of a defective sensor, the transmission may shift gears erroneously, leading to an uncomfortable ride.

Clogged filters

Your gearbox may jerk when shifting gears if the transmission filters become blocked up with dirt or debris. A skilled mechanic can remove any debris from the system and restore it to full functionality.

Worn parts

It’s possible that portions of an automatic transmission will wear down over time, resulting in shifting issues. To avoid jerking actions when shifting gears and other concerns like slipping or grinding, these worn components must be changed in a timely manner.


What Is Normal RPM While Driving?

It is customary to drive at 2500 RPM, although this might vary depending on a variety of factors, such as how fast you’re travelling and the make and model of your vehicle. For example, certain automobiles may have higher or lower cruising speeds than others because of variances in engine architecture.

If your engine revs up excessively while accelerating, you should look for leaks in your fuel pump or throttle body that could be causing the problem.

For best performance, you don’t need to shift into a higher gear like fifth while starting from a standstill and traveling up to the cruising speed limit (e.g., 60km/h). This is because the ratio means that each spin provides less torque output than fourth gear does.

Spark plugs and air filters may need to be replaced if your engine rpm are too low. It’s also a good idea to check for vacuum leaks, as they might reduce the engine’s power and interfere with the fuel injection system.

The final step is to ensure that all of your fluids (engine oil, transmission fluid, and braking fluid) are at the correct amounts and are free of contaminants.

Can A Bad Timing Belt Cause Jerking Problems?

It is possible to have jerking problems if the timing belt is defective. A misfire follows, and your automobile jerks when you accelerate or decelerate suddenly or when it’s just sitting there.

Before starting up again after an extended period of time, the engine may stall due to worn-out or broken timing components, such as an intake valve spring, that aren’t properly lubricated with oil (like overnight).

Why Does My Car Rev High When Idling?

When your automobile is idle, the engine can be running at a high RPM because of a faulty vacuum hose that is allowing more air than necessary into the system.

Consequently, the car’s engine revs up in an effort to compensate. Having a filthy air filter could also be a contributing factor to this issue, which will cause the engine to rev higher than normal and reduce performance.

A broken fuel pump or insufficient levels of engine oil or transmission fluid may also be to blame.

A diagnostic examination at your local automotive service center is the best course of action if you’re not sure what’s causing your car to rev high when it’s idle. They’ll be able to identify the problem’s root cause and offer a remedy.

Can A Faulty Speed Sensor Cause Jerking?

Jerking can occur if the car does not know how quickly it is travelling and what gear to select. As a result of shifting gears when it’s not necessary, you’ll have a bumpy ride and waste fuel (e. g. , when accelerating).

If an error code is present, the computer may recognize it, which could lead to further issues such as engine misfiring or stalling out completely.

Can A Faulty Throttle Position Sensor Cause Jerking?

An engine management system can’t tell where the accelerator pedal is in relation to its regular range when the throttle position sensor is defective. This can lead to jerking. Acceleration will feel jerky or harsh as a result of this.

An automobile service shop is the best place to take your car for an examination in order to identify whether there are any other concerns, like a filthy air filter or low levels of engine oil, that may need to be fixed as well!


Your automobile revving while you’re driving could be caused by a number of different things. This could be due to a number of other factors as well. A professional technician should be consulted if you’re encountering this issue.

The technician will be able to give you an idea of what to do next once they’ve determined the source of the problem. So that your automobile works smoothly and doesn’t randomly rev, you should have this problem addressed as soon as possible!