What Causes a Car to Backfire on Acceleration and How to Fix It Easily

So, what is Backfire? Backfire occurs when the engine is working and can happen in the air and fuel intake and the exhaust gas line. But now, backfire is rare because many modern cars use the Electronic Fuel Injection (EFI) system.


The EFI system can reduce the risk of backfire because it has a good ignition process and fuel supply, and interdependent emission control. However, the injection system does not adequately protect the car from backfire.

What Causes a Car to Backfire on Acceleration?

The following are some of the leading causes of a car backfire on acceleration.

1. Low fuel pressure: can be caused by dirty/clogged gasoline filters, the problem in the gas pump, dirty/clogged fuel injectors, fuel pressure regulators aren’t feasible to use, and broken/torn fuel pressure regulator hoses

2. Imperfect mixtures of fuel and air

3. Incorrect ignition timing

3. There is damage to the supplier of clean air leading to the combustion chamber

4. The wrong sequence of spark plug wiring and improper use of spark plugs or dead plugs.

5. Dirty car carburetor

6. Valve intake has a problem like a leak

7. An air filter encountered a problem. Dirty air filters cause the ignition system in the combustion chamber to be imperfect and make popping sounds on the exhaust.

8. The process of ignition or combustion in car engines is disrupted.

Checking the condition of each combustion part of the car engine during routine maintenance is essential to ensure which sections need to be replaced so that the engine functions normally.

Explosions at intakes usually occur due to incomplete mixing of fuel and air because there is very little fuel.

As a result, when the exhaust valve opens to start the exhaust process, the heat will face fuel that is slow or can’t burn.

So, when the heat temperature starts to burn fuel, simultaneously, the intake valve opens for suction and then delivers a mixture of new fuel and air. The result is explosions whose flames can ignite and spread to the air filter in an instant.

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Exhaust backfire occurs due to unburnt fuel in the combustion chamber and only burns after being discharged to the exhaust manifold, which is very hot. Exhaust backfire also occurs due to wrong or late ignition timing. As a result, unburnt fuel and air will lead to hot exhaust, and explosions occur.

So those are the eight factors that lead to a car backfire.

What are the Problems Caused by Backfire?

Backfire can cause several problems as below:

    • Engine power is lost: every explosion in the combustion chamber generates enough power for the rotating engine shaft. If explosions do not appear in the combustion chamber, the engine loses rotating ability.
    • Wasteful of fuel: Every drop of fuel is expected to be the power to turn the engine shaft, but that does not happen
    • Damage to engine components: Intake hose breaks, torn air filters, exhaust leaks, and so on.

How to Overcome Backfire on Your Car

So, I will provide information based on personal experience when my car experiences a backfire. At that time, my car engine was working rather harshly and was vibrating a little when the car engine had reached its working temperature.

When I drive, it gets stuck at 2,500 Rpm, and when I step on the gas pedal deeper, there are popping sounds in the engine room and the exhaust at the same time So, why does my car backfire?

Based on various information from mechanics who understand the engine well, almost all of them say that there are some ignition or ignition timing issues.

After I checked, there was a spark plug cable that was torn, and I fixed it. However, a backfire still happens, and the engine loses power. Then I tried to replace the ignition coil, try adjusting the valve, and changing the engine oil, but the results were the same. Likewise, when I check the engine compression, all conditions are right.

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Then I decided to replace the spark plug again. But when the car had just covered a distance of about 2 Km, it turned out that spark plugs numbers 1,2, and 3 turned black, while the spark plugs numbers 4,5 and 6 were still pure white, and that’s a perfect combustion sign.

So I found that the black spark plug was a sign that the fuel wasn’t burning correctly because of the imperfect Fuel Injector spray. Then I tried to clean the Fuel Injector in a regular workshop with an Ultrasonic Fuel Injector Cleaner engine. You can also use the TOP 1 Power Booster 500Ml for gasoline or diesel cars.

When the fuel injector was tested, it turned out that injectors number 1,2 and 3 only sprayed half the other nozzles’ gas.

As a result, the mixture of gasoline and air becomes very lean so that the gas does not burn, and the mixture will burn in the Exhaust Manifold and cause a backfire. After the fuel injector is clean, I reinstall it in the car, using the new O-Ring Injector.

As a result, the car’s engine has become smooth and very powerful. Yet at that time, the fuel injector’s age in my car’s engine was still relatively new, around nine months, and everything was replaced with a new one. However, dirt on the gas tank that passes through the gasoline filter turns the fuel injector clogged.

After fixing ‘everything,’ I immediately did an emissions test so that fuel combustion was even better, and the result was the performance of my car returned to normal. I could drive to travel long distances.

Well, that’s my experience when fixing a backfire in my vehicle.

Hopefully, information about what causes a car to backfire on acceleration can be useful for you.

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