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Facing problem with Car won’t accelerate, but RPMs go up?

It’s not uncommon for high-mileage vehicles to show signs of under-acceleration. A driver might not see these indications in regular driving, but they become evident while driving up a steep hill or trying to accelerate quickly into fast-moving traffic.

If you don’t know why your car won’t accelerate, you have come to the right place. Here we have shared some common reasons that can happen to your car so that you can make sure why your car won’t accelerate but RPMs go up.

Reasons that car won’t accelerate

Although this is a common problem with high-mileage vehicles, it does not indicate any severe or immediate problems. For some causes, you will need to hire a mechanic. Given below are some of the common reasons:

No Fuel

Although these may appear to be apparent causes for slow acceleration, you must ensure the emergency brake is not activated and enough gas. These issues can cause slow acceleration, or worse, stalling. Although this is unlikely to happen, it is worth noting in the first spot before any further troubleshooting.

Fuel Problems

An often-overlooked part, a clogged or dirty fuel filter, is a typical cause of engine failure. Fuel filters get clogged with fuel debris and sediment over time. You should change them regularly.

Acceleration problems can also happen by a defective tank of gas, the wrong octane, or pollutants in the fuel. You can fix this by emptying the tank and then filling it up with fresh fuel.


Misfires can also result from defective spark plugs, distributors, and ignition coils. A cylinder will not explode if it does not have a spark. In some cases, a spark that is not right at the right time can harm the engine.

Ignition coils convert low voltage from the battery into high voltage for the spark to leap the gap on the spark plug. The distributor transmits this voltage to the sparkplugs. A distributor is not necessary for modern cars.


Restricting airflow is one of the essential requirements for combustion. That will lead to acceleration problems. Dirty or clogged engine air filters could lead to problems. It is better to change the air filter at intervals regularly. Check your service manual to keep track of the dates.

Vacuum Hoses

Many components around the car, including the brake booster, fuel pressure regulator, and EGR valve, are controlled via vacuum hoses. A leak in one of these hoses can cause erratic behavior of the related component.


It is a joy to step on the gas, revving the powerful engine, and it makes a satisfying sound that often means that the car is ready for you to drive. However, in some cases, your vehicle may not rev but perform well or stop moving at all.

We gave you the list of why your car won’t accelerate, but RPMs go up is not complete. You may also have a slipping clutch or a transmission problem that may cause slow acceleration. It may surprise even experienced mechanics.

I recommend that you take your car to a trusted mechanic for a thorough checkup. He will be able to diagnose the problem and suggest a fix.

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