Car Not Accelerating but RPMs Up? Identify and Fix the Problem

Diagnose why your car won’t move when you press the gas

Co-authored by Duston Maynes and Eric McClure

Last Updated: July 16, 2025 Fact Checked

RPM stands for revolutions per minute, and the number of RPMs on your tachometer indicate how many rotations your engine’s crankshaft is making every minute. The more rotations, the faster you should go. But if your car doesn’t feel like it’s accelerating at the rate it should be based on how hard you’re hitting the gas pedal, it points to two systems: intake going into the engine, or the power the driveshaft is receiving from the transmission. In other words, something is wrong with the air and fuel feeding into your engine, or something is wrong with your transmission’s power output. In this article, we’ll break down every potential option, how the repair will work, and how much it’ll cost.

1

Low Transmission Fluid

Download Article

The transmission is responsible for shifting your vehicle’s gears and transferring power from the engine to the wheels. Inside, transmission fluid pumps through the components to keep the gears lubricated and help with heat dissipation. If the fluid is low, the transmission will struggle to transfer the power you’re sending to the engine to the wheels.^{[1]
X
Research source}
- Other symptoms: Your gears slip, shifting gears becomes difficult, and grinding noises come from your vehicle.
- The fix: Check your transmission fluid by removing the dipstick when the engine is cold. If it’s low, add more fluid to resolve the problem. See a mechanic if the problem reoccurs soon.
- The cost: If you only need more fluid, expect to pay $20 or so. If there’s a leak or you need a transmission fluid change, it’ll cost $50-200.

2

Bad Torque Converter

Download Article

The torque converter is a fluid coupling between your engine and the transmission. To put it simply, the torque converter allows the engine to continue running when you brake or idle. If your torque converter is bad, your transmission won’t transfer power correctly.^{[2]
X
Research source}
- Other symptoms: Overheating, slipping gears, and trouble shifting. You’ll also notice your transmission fluid going bad extremely quickly when you refill it, and unique engine shaking over 30–45 miles per hour (48–72 km/h).
- The fix: A transmission specialist will look at your torque converter and assess the proper repair.
- The cost: A new torque converter typically costs $500-1,000.

3

Disconnected Drivetrain

Download Article

The drivetrain sits under the engine bay where the transmission connects to the axle and spans the length of the center of the car. It transfers power to the wheels and enables them to move.^{[3]
X
Research source} But if your drivetrain isn’t properly connected to the axle or there’s a loose connection between the drivetrain and the powertrain, your vehicle either won’t accelerate or struggle to get up to speed.^{[4]
X
Research source}
- Other symptoms: Big vibrations coming from underneath the vehicle when it’s on, difficulty turning, and loud clunky noises.
- The fix: See a mechanic to have them diagnose and repair your drivetrain. They’ll either reconnect it to the powertrain or replace it.
- The cost: Reconnection should only cost $400-1,000. Unfortunately, replacements tend to be very expensive. Expect to spend $4,000-10,000 depending on how powerful your engine is and how big your vehicle happens to be.

4

Bad MAF Sensor

Download Article

The MAF (mass airflow) sensor is responsible for measuring the amount of air that flows into the engine. The amount of air is important because it’s a key component in the air + fuel + spark equation that helps each cylinder fire in the engine fire. If the MAF is sending bad information to your engine’s computer, you may not be getting enough air to burn the fuel you’re feeding into the engine.^{[5]
X
Research source}
- Other symptoms: Your check engine light pops on, your engine misfires, and you get poor gas mileage.
- The fix: You probably need to clean your MAF sensor. If that doesn’t work, it may need to be replaced, so see a mechanic.
- The cost: If your MAF sensor needs to be replaced, it’s likely to only cost $300 or less.

5

Throttle Position Sensor

Download Article

The throttle position sensor monitors your throttle valve to ensure it’s opening as much as you’re telling it to open with your gas pedal. If that throttle sensor is bad, your valve won’t open to match the amount of spark and fuel your engine is receiving and you’ll end up wither terrible acceleration.^{[6]
X
Research source}
- Other symptoms: Your check engine light pops on, you get strange fuel surges, your engine surges, or your gas pedal doesn’t respond properly.
- The fix: The sensor probably needs to be replaced, so see a mechanic to have the work performed.
- The cost: Expect to spend around $150-250 getting your throttle position sensor replaced.

6

Clogged Fuel Filter

Download Article

The fuel filter cleans the fuel of impurities and sediment before it leaves your fuel line and enters the engine. Over time, that filter soaks up a ton of debris, which can cause the amount of fuel that actually enters your engine to be lower than it should be. This will lead to a high RPM and poor acceleration.^{[7]
X
Expert Source

Duston Maynes
Automotive Repair Specialist

Expert Interview}
- Other symptoms: Engine misfires, stalls, and loud noises coming from the fuel pump.
- The fix: The odds are high you only to clean your fuel filter, so remove it, spray it with a solvent cleaner, and wait an hour before replacing it.
- The cost: If the problem persists or your fuel filter needs to be replaced, you’ll likely only need to spend $50-175.

7

Bad Fuel Pump

Download Article

Your fuel pump is located near your fuel tank. If the name didn’t give it away, its job is to pump fuel from the tank to the engine. If it isn’t pumping enough fuel though, your engine will struggle to maintain speed when you accelerate.^{[8]
X
Research source}
- Other symptoms: Your car stutters, you hear a whining noise coming from your fuel pump, and your vehicle just generally runs inconsistently.
- The fix: See a mechanic to have the fuel pump replaced. This isn’t a particularly complex replacement, but it does need to be performed by a professional.
- The cost: The expensive part here is the actual fuel pump, not the labor. It’ll likely run $900-1,100.

8

Bad Throttle Body

Download Article

The throttle body is responsible for controlling the amount of air as it flows inside your engine. Without the proper amount of air moving into each cylinder, the spark and fuel won’t combust properly. The RPMs will move up, but you won’t see that power reflected in your actual acceleration.^{[9]
X
Research source}
- Other symptoms: Your engine idles too fast or too slow or you get surges in your electrical system which cause dash lights to get bright or dim. Your check engine light will also likely turn on.
- The fix: The throttle body usually just needs to be cleaned. If you know how to do minor engine repairs, spray throttle-body cleaner between the air cleaner and intake manifold.
- The cost: If you pay a professional to clean the throttle body for you, it’ll cost $100-300.

9

Worn Clutch Disc (Manual Transmission Only)

Download Article

If you drive a manual car, you have a manual transmission that you control with your gear changer and clutch. Inside the transmission, there is a disc that spins to shift the gear. As an additional part of its job, that disc absorbs the friction from the spinning gears. If this disc wears down, it can cause your vehicle to lose the power it should have when you change gears.^{[10]
X
Research source}
- Other symptoms: Weak acceleration, noises, strange burning smells, and a loose or sticky clutch pedal.
- The fix: The disc almost certainly needs to be replaced. See a transmission specialist to have them resolve the problem.
- The cost: It really depends on your make and model. On the lower end, expect to spend $1,200-1,400. If you need the transmission to be rebuilt, it can cost up to $3,000.

Expert Q&A

Search

Add New Question

Ask a Question

200 characters left

Include your email address to get a message when this question is answered.

Submit

Video

Tips

If your vehicle is running alright at low speeds and you’re going to the mechanic immediately, don’t worry about pulling over to call a tow truck. You can make it to the repair shop so long as you go slowly.

Thanks
Helpful 12 Not Helpful 5

Submit a Tip

All tip submissions are carefully reviewed before being published

Name

Please provide your name and last initial

Submit

Thanks for submitting a tip for review!

Warnings

Do not begin tinkering with your engine or transmission if you don’t have any formal training. These components are essential for the health and functionality of your vehicle, and if you make any minor mistakes you could end up causing expensive damage.^{[11]
X
Trustworthy Source

Consumer Reports
Nonprofit organization dedicated to consumer advocacy and product testing

Go to source}

Thanks
Helpful 0 Not Helpful 0