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Why Does My Car Lose Power?

Why Does My Car Lose Power?

Why does my car lose power? In most cases, a loss of engine power is related to a mechanical failure in your vehicle; however, a loss of power may also be due to an external factor such as high temperatures.

If your car loses power while you are driving, there may be a variety of different reasons why. In this oneHOWTO article we'll help you diagnose your car's problem yourself, offering a number of possible answers to explain why does your car loses power and giving you some tips on how to fix the problem.

You may also be interested in: Why Is My Car Engine Light On

Does your car lose power because of a fuel injector?

Your car may lose power if an injector has poor contact with the internal combustion engine. If this is the cause of the problem, you will notice an exaggerated vibration in the motor.

We recommend that you maintain these parts well. It can be done by a mechanic, but you can also learn how to do it by yourself by reading our article how to clean a fuel injector at home.

Does your car lose power because of the turbo engine?

If your car's model is among those which have a turbo engine or turbocharger, something that is increasingly common, you may find that this element is the reason why your car loses power when you drive.

It may be that a tube connector of the turbo engine is damaged, or simply dirty or poorly adjusted. This fault can also occur because the valve that regulates the turbo does not work properly. Here you can learn how to maintain a turbo diesel engine.

Does your car lose power because of the AC system?

If you turn on the air conditioning system when you drive, your car will lose power. You will notice this especially when you go on a road trip, or with smaller vehicles used primarily for city driving. If you are overtaking while going uphill and have the air conditioning on, you will notice how the engine can feel like it is losing power.

There is no need to worry, but be aware that the air conditioning system will use of some of your engine's available power factor when driving.

Here you can learn how to clean your car's AC system, how to recharge it at home, and how to get rid of bad smell from car air conditioner.

Does your car lose power because of the cooling system?

The cause of your car's power loss could also be an overloaded internal combustion engine cooling system. In extreme conditions generated by very high external temperatures, the car's fan has to act at peak performance. This takes away power to the rest of the engine equivalent to about 2 hp.

Here you can learn more about why is my car thermostat going up and down.

Does your car lose power because of an error in the ECU?

For cars with an ECU (Electronic Control Unit), an error in this embedded system can cause the car to lose power. In some cases, the car may stop completely.

This fault, which is not easy to solve, often happens because the ECU system detects a mechanical error in the car that doesn't actually exist. Therefore, the ECU gives the command to lose power or stop to the engine in order to prevent an accident although there is no reason to do so.

In most cases, ECU failures get fixed on their own and you will be able to use your car again after half an hour without a problem. However, you should go to a professional to repair the unit so that it does not fail again.

Does your car lose power because of the catalytic converter?

If your car loses power when you accelerate, or if it accelerates more slowly than usual, it could be that your catalytic converter may be blocking gases and thus not allowing your car to rev like it should: here you can learn more about why doesn't your car accelerate properly.

To check if your car is losing power because of the catalytic converter, you'll only need to pay attention for a rattle-like sound when you tap the catalytic converter lightly with a hammer or similar. Visit a mechanic if this is the case or clean the catalytic converter by yourself at home.

Another reason why your car loses power when you accelerate or doesn't accelerate at all when you press the acceleration pedal may be because your fuel filter is bad.

Other possible car problems

If as well as experiencing a loss of power you have noticed that your car jerks or makes a sound like an airplane, we have plenty of other articles to help diagnose your specific issue.

Do you know other reasons why a car loses power? Tell us in the comments section and help out other readers!

If you'd like to read similar articles to Why Does My Car Lose Power?, we recommend you browse around our Car Maintenance and Repair category.

Comments (48)

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What did you think of this article?
my car vauxhall zafira 2.2 petrol ,when i start the car first time i got sign car with spanner and i loses power to go ,but when i switch the car off and switch on again the sign car with spanner despair and the car drive normally .anyone know whats the problem.Thanks
Ruby Russell
I have a 2004 Volkswagen beetle and just put a new battery in ,, for about a month though whenever I push the gas to go it doesn't wanna go. I tap it and it goes fine.. Some days it doesn't act up.. What could it be
i have a hyundai getz 1.4 2008 its been losing power.i have change the fuel filter in tank.due to every one saying its needing fuel .it ,went great the same day next morning i have no power cant even get the car to move and my foot is flat on fuel
Have a 2005 turbo diesel manual terracan. Recentlty I have noticed vehicle loose power for about half a second then comes good. Not warning lights show. Prior engine had a stutter when idling. Can you advise
Rick Grech
My car lost power while driving about 50MPH after driving only about one mile. It would not start at first. It started about 20 minutes later. The engine check light came on and the mechanic indicated the air mass filter needs to be changed. He did not think this was the cause for the car losing all power. What could it be?
Kindly change your fuel pump and you will be fine
I have a Mercedes c220 & have had a problem with losing power but can't get to the bottom of the problem, it works great then all of a sudden decides to it wants to go on a go slow mode for no reason, I've noticed if I pull over & turn off the engine then start again it's fine & so on.
siamalonda clement
what more makes my car with Electronic Control Unit lose power
I recently purchased a mercedes benz E320. It is a 2003, and check engine light is not on. When driving sometimes it feels like its trying to lose power and now its accelerating slow. It comes and goes it will be driving fine and feels like losing power briefly and then picks up again and drives normally. Any ideas of what could be going on? Thank you
Edward Rosado
I have a 2000 I30 Infiniti when I drive my car for a half hour the RPMs rev High and the car starts going slow does anybody know what could be the problem it would be really appreciated for someone to help
I had that problem with a vehicle in past it was the fuel injector
Edward Rosado
My 2000 I30 Infiniti when I'm driving my RPMs go very high and the car starts driving slow I pull over for 5 minutes shut the car off restart the car and the car runs normal what could be the problem can someone help me out there it would be gladly appreciated

Why Does My Car Lose Power?
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Why Does My Car Lose Power?