5 Reasons Cars Won't Accelerate But RPMs Go Up Automatic

We subconsciously relate pressing the race pedal to the acceleration of our vehicle, which is accurate, and that's why it feels so irritating when the vehicle's speed does not increase on pressing the accelerator, and just the RPMs go up. 

This can happen for many reasons, some of which might be simple and some complex. This article will tell you the approximate reasons why your car won't accelerate, but RPMs go up automatically. There will also be some discussion about why the vehicles won't go above 40mph or 20mph. If you have these problems or want to get factual information to avoid these troubles, then keep reading.

Why a Car Won't Accelerate But RPMs Go Up

 RPMs going high will make your driving experience uncomfortable, and you might feel the engine vibrating as in rough idling. There is not just one reason for RPMs to go high, so we cannot say the exact reason. But you can start by checking the plug because if it has gone wrong, it will undoubtedly affect the engine's RPMs. Also, check if the pin is covered by dirt or some other impurity that affects its ability to generate spark smoothly and causes the machine to be idle rough.

A leak in the pipes delivering air and fuel to the combustion chamber can also cause the RPMs to go up automatically as the air will mix with the gas. A dirty air filter, a clogged fuel injector, and a damaged carburetor can also increase the RPMs than usual. These are some simple reasons you can repair yourself if you know a little about your vehicle and its engine. But if there is a problem in the transmission system, like it's slipping, you should stop using the car and take it to a mechanic for repair to prevent further damage.

Why a Car Won't Accelerate Past 40

A few general reasons when your car does not accelerate above 40 mph are as follows

  • A faulty or blocked exhaust pipe.
  • Insufficient fuel pressure.
  • It might be a floating valve reducing the efficiency of the engine.

Why a Car Won't Accelerate Past 20

If your car is not going past 20 mph, you should first think about the last time you took your vehicle for service? Because it might very well be the problem. A broken catalytic converter or clogged filter can also cause this condition.

5 Reasons A Car Won't Accelerate, But RPMs Go Up

Fuel Filter

The cleaner the fuel, the more power it will generate during combustion to run your vehicle at higher speeds. So ensure that the fuel filter is clean and is not adversely affecting the engine.

Exhaust Filter

The functioning of exhaust filters might not be that important for you on a flat road, but it is a must when driving uphill. Otherwise, there are chances that your car will not move.

Cylinder Compression

If the fuel pressure is insufficient, the engine won't get the required fuel at a uniform rate to push your car faster.

Air Filter

Clean air is also required for better engine working, so keeping the air filter clean of dust and other impurities is essential.

Camshaft Sensor

A faulty camshaft sensor will also reduce the engine's power by providing wrong timing for speed.