Can A Bad Battery Cause A Misfire?

Key Notes:

  • A bad battery can contribute to circumstances that can cause engine misfire. But it is not common for bad batteries to directly cause this problem.
  • You can use an OBDII code scanner to easily identify the problem with your car.
  • Changing the battery every 3-4 years would keep equipment that relies on the battery healthy.

A bad battery can contribute to causing a misfire but it cannot directly cause it. When a battery goes bad, much equipment in the car is adversely affected.  Those parts afterwards can directly cause a misfire.

In this post, I will not only discover can a bad battery cause a misfire but also how to remedy the situation. Once you reach by the end, you will be able to diagnose common problems yourself. This way you will gain more experience handling engines and also save some bucks.

Can A Bad Battery Cause A Misfire?

As I said earlier, the battery cannot directly cause misfire but they can contribute to it. One instance for example would be when the fuel pump is deprived of power. Let me explain.

The responsibility of the fuel pump is to pump the fuel into the combustion chamber of the engine. This pump is powered by a battery. When the battery becomes weak, it affects the pump.

The fuel pump can slow down if the battery goes bad. As the result the fuel becomes lean. Lean fuel means it contains more air than the fuel itself. If the fuel becomes too lean, then it will cause the engine to misfire.

There are certain parts that are powered by the battery such as the injectors. A bad battery can cause the injectors to open improperly. When injectors open improperly, a misfire is very likely to happen.

How To Prevent Misfire

Keep in mind that the battery is not directly responsible for the engine misfire. Other reasons like a damaged spark plug, malfunctioned sensors, etc. are more likely to cause a misfire. Here is how to prevent engine misfire.

  • Check the spark plugs first, damaged spark plugs cause misfire most of the time.
  • If the air and fuel mixture ratio gets altered, that can cause a misfire. It can cause by faulty emission systems, slow fuel pumps, malfunctioned injectors, etc.
  • Issues with an internal circuit like loose or damaged wiring can cause it. So, check the internal circuit thoroughly.
  • The best option is to use an OBDII code scanner. It will diagnose the car and show you the exact error codes. Then you can take action depending on the result.

Battery Status

VoltageCharge PercentageBattery Status
12.6+100%Normal
12.590% 
12.480% 
12.370%Weak
12.260% 
12.150%Slow Cranking
11.940%No Cranking
11.830% 
11.720% 
11.610% 
10.50%Dead

Weak Battery Symptoms

Here are the signs you should look for if you suspect the battery has become weak.

  • The crank becomes slow
  • The headlights get dimmed
  • The battery terminals get corroded
  • The battery loses the ability to hold a charge
  • You might notice a smell coming from the battery

Product Recommendation

XS Power D3400 XS Series: This 12-volt battery offers continuous high-power output due to its ultra-low resistance. It is an Absorbed Glass Mat battery. This means it is spill proof, vibration resistant, sealed, and valve regulated. You can mount it in almost any position.  

ACDelco Gold 48AGM: It comes with a high-density negative paste which increases battery life and improves performance. The use of Calcium Lead maximizes conductivity. The manufacturer included a vent cap with a design that resists acid leakage.

ExpertPower: The rugged construction of this battery makes it resistant to shock, heat, chemicals, and vibration. It is not only built for performance but also to last longer. It is spillproof and maintenance-free.

Frequently Asked Questions (FAQs):

Can a bad battery cause rough idle?

The alternator will have a hard time keeping the engine running when the battery cannot put out enough power. So yes, a bad battery can cause a rough idle.

What are the symptoms of a bad battery?

Among many symptoms, you should look for the slow crank, dim headlight, backfiring, and clicking sound when starting. These are the most common signs that your battery is failing.

What are 3 common possible causes of a misfire?

The most common possible causes of misfire are ignition problems, fuel delivery problems, and problems in emission equipment. A misfire can be caused by many reasons outside the scope of these problems.

What sensors can cause a misfire?

In case the airflow or the oxygen sensor fails, they can cause a misfire in the engine.

What happens when a cylinder misfires?

When a misfire happens, you are likely to experience shaky or slow acceleration, also the engine could briefly lose power. When idle you would notice more vibration than normal.

Bottom Line

So can a bad battery cause a misfire? To sum up the answer, it is rarely directly involved but more often than not contributes to the problem. A bad battery can cause a myriad of problems engine misfire is one of them. This sort of problem often gets hard to troubleshoot. The best course of action would be to routinely check the condition of the battery.

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