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Can Coolant Cause Misfire? (Answered)

Coolant is used in cars to regulate the temperature of the engine. Coolant is generally used with water by maintaining a 1:1 ratio. The car engine needs coolant to fight against the changing weather conditions. Today, we are going to discuss whether coolant can cause misfire or not.

Can coolant cause misfire?

Coolant can certainly cause a misfire in the car engine if it starts leaking. The temperature of the engine is not regulated thoroughly if the coolant starts leaking. The mixture of coolant and water helps the engine control unit to determine how much fuel should be injected into the engine. 

Let’s look at different states of coolant to find out if it causes a misfire in the car engine.

Coolant leak:

Coolant is one of the most important liquids needed by the car to produce a good performance. Coolant helps the car engine to control its temperature in different weather conditions. The car coolant can start leaking for several reasons. 

If you sense that your car coolant has a leak, it is better to inspect the coolant level in the expansion tank.

You will also notice coolant on the ground of your garage or parking area if you have a coolant leak in your car. Your car coolant might start leaking if you have a hole in your car radiator. The coolant can start leaking if the head gasket is blown for some reason. 

If you have a blown head gasket, then the engine oil and coolant will get mixed together and start to leak.

A blown head gasket can even result in misfires in the engine. Because the car coolant will start leaking into the engine cylinders through it and cause misfire inside the engine. 

Coolant leakage through any other important parts of the engine can also cause a misfire in the engine.

Low coolant:

The state of low coolant or no coolant is not ideal for the condition of your car. Coolant can start leaking and take the coolant level to too low level. It usually happens when the head gasket is blown. 

The engine becomes blocked when the coolant starts leaking and a low level of coolant causes misfires in the different parts of the engine.

If you have a low coolant level because of a leak, you should immediately find the leak and repair it. After repairing the leak, you will have to refill the expansion tank with a new coolant to prevent your car engine from misfiring.

What are the symptoms of a coolant leak?

If you have a coolant leak in your car, it will start showing several symptoms. Let’s discuss them in detail.

Sweet smell:

If you have a coolant leak in your car, you will start sensing the sweet smell coming from your car. This sweet smell often indicates that there is a coolant leak. You can even sense this sweet smell while you are driving.

Puddle of coolant:

You start noticing patches of coolant lying on the floor of your garage or parking area if you have a coolant leak. Coolant comes in many colors because the coolant makers want to make it distinguishable from other fluids of the car. 

If you see a red, pink, yellow, green, or orange puddle of fluid under your car, then you can be sure that you have a coolant leak that must be fixed immediately.

Engine overheating:

The primary job of coolant is to regulate the temperature of your car engine in all weather conditions. If you have a coolant leak in your car, the engine will start to overheat because the void left by the leaked coolant will be filled by the air. 

When this happens, your engine will overheat and struggle to start.

Clouds of smoke:

If you have a coolant leak inside the engine, you will see white smoke coming from the exhaust. This can happen if the head gasket is blown. If the head gasket blows, then car coolant starts leaking into the cylinder and the engine starts misfiring. 

As a result, the white smoke can be seen exiting the exhaust.

How much does a coolant leak cost to fix?

There is not a definite answer to how much it costs to fix a coolant leak. If you manage to notice and locate the leak at the early stage, only one hundred to one hundred and fifty USD might be enough to fix the coolant leak

The longer the coolant leak remains, the more it damages the car.

When the coolant leak has been present for a long time, only fixing the coolant will not be enough. The parts of your car affected by the coolant leak will need to be fixed as well which can take the fixing cost to around one thousand USD.

Can you drive a car with a coolant leak?

Driving with a coolant leak is not a wise thing to do. A coolant leak can cause several problems to your car. It can permanently damage parts of your engine. Coolant is essential for the optimized performance of your car. 

Coolant helps your car engine to cool off by supplying cold air into the engine. If you notice a coolant leak in your car, you should fix it immediately to avoid increasing the maintenance cost of your car.

Can a misfire cause coolant loss?

A misfire is usually the aftereffect of a coolant leak. If the head gasket is blown, then the car coolant starts leaking through the head gasket and blocks the engine cylinders. This causes the engine to misfire. So an engine misfire is not the cause behind coolant loss

Rather a coolant leak is a reason behind your car engine misfiring. A misfiring engine is actually a symptom of a coolant leak.

Can a bad coolant temp sensor cause misfire?

A temp sensor can go bad for several reasons. The primary function of the coolant temp sensor is to determine the temperature of the car coolant. The coolant temp sensor then sends this information to the Engine control unit for it to inject fuel into the engine.

An inaccurate reading sent by the coolant temp sensor can make the fuel ratio very lean and cause one or multiple engine cylinders to misfire. The engine cylinders misfire because it fails to produce enough power because of the lean fuel ratio.

Thus a bad coolant temp sensor can cause a misfire.

What problems can a bad coolant temperature sensor cause?

A bad coolant temperature sensor can cause several problems. Let’s discuss in detail some of them.

An increase in fuel consumption:

A bad coolant temperature sensor will fail to send an accurate reading to the Engine Control Unit. The coolant temperature sensor determines the temperature of the car coolant and sends that data to the engine control unit.

The engine control unit then uses the data to send adequate fuel into the engine.

With an inaccurate reading, it will not be able to do its job and this will increase the fuel consumption of your engine.

Engine failure:

A bad coolant temperature sensor can cause permanent damage to the engine. If your coolant temperature sensor becomes bad, it will overheat the engine or cause it to misfire. Both of these incidents can damage your engine permanently. 

It can cause starting problems in your engine as you will find it difficult to start your engine.

Cooling fan failure:

A coolant temperature sensor is instrumental for the maintenance of the cooling fan of your car. If your coolant temperature sensor goes bad, the cooling fans will fail to perform their actions.

Can overheating cause misfire?

The primary job of the car coolant is to maintain the temperature of the car engine. If the engine becomes too hot, the coolant makes it hot and if the engine becomes too cold, the coolant warms it up. 

If there is a coolant leak in your car, then it will cause the engine to overheat. When the engine becomes overheated, the engine cylinders will start misfiring as an aftereffect of overheating.

Can a bad radiator cause a misfire?

If your radiator has a hole in it, then the coolant will start leaking. This leaked coolant will jam the engine cylinders and cause them to misfire. Even a faulty radiator cap can cause your engine to misfire.

Sometimes the inaccurate mixture of coolant and water can create a hole in the radiator. When a radiator becomes bad, it can not contain the coolant inside it. As a result, the engine starts misfiring because of the low level of coolant.

Thus a bad radiator can cause an engine misfire in many ways.

Final Thoughts

The engine starts misfiring if there is a coolant leak inside your engine. The head gasket is blown when there is a coolant leak. The leaked coolant can alter the supply of fuel into the engine and the engine cylinders start misfiring as a consequence.