Do you know “car breaths”? Yes, your car breaths as like you.

It takes in air and releases continuing fuel and air through the exhaust. Let me clarify. To drive the car, your car engine needs appropriate air that means oxygen and fuel combination on its cylinder. It makes explosions on the cylinders.

To supply this oxygen is the task of the intake manifold. It distributes the same amount of air to each cylinder.

Generally, a leaky intake manifold gasket will make various symptoms that can alert you at the initial time. So, you need to know the intake manifold gasket leak symptoms clearly.

Let’s dive!

What is an Intake Manifold Gasket?

The Intake manifold gasket is one of the most valuable gaskets you found on your car’s engine. This is made of metal, rubber or plastic and sometimes with the combination of these elements. It fills the small gap between the engine and intake manifold.

If this gasket is failed then excessive air enters into the cylinders. It causes engine overheating and drivability problems.

Symptoms of Intake Manifold Gasket Leak

1. Coolant Leak

car is leaking coolant

Car is leaking coolant for several reasons.

One of the recognizable symptoms of bad intake manifold gasket is coolant leaks. Intake manifold gasket works as a seal for the coolant of your car engine. Generally, when this seals were damaged, then the coolant will flow out over the seal. Leaks allow the coolant and motor oil to mix together. External leaks are very easy to find.

But if there is an internal leak which causes the coolant to flow into the combustion chamber is quite tough to spot them. But you need to ensure, is it coolant leak or not?

Possible Places to Find a Coolant Leak:

Finding Process:

After confirming the coolant leak, you need to find the location of leaking. If the coolant is leaking out through the joining point of the engine and the manifold, then it happens only for the damaged gasket. The coolant can also leak through the radiator or the rubber pipes.

2. Engine Overheats

Engine overheats

An overheated engine is another reason of the failing intake manifold gaskets. Continuous coolant leaking is the cause of overheated engine. In every time you do not appear the coolant to be leaking.

Sometimes coolant will not leak in the intake manifold gasket, directly go to the intake manifold. It causes to overheat the engine. Also, you can’t find any external leak.

If your engine is overheating, check these below ways to identify.

3. Engine Performance Issues:

car engine performance

Another common symptom is engine performance issue. The leak of intake manifold gasket can create major performance issues like stop engine vacuum and generate pressure.

For this reason, too much air enters in the cylinders and there is not enough gas for performing. It will cause engine performance issues like stalling, misfires, decrease acceleration and power.

4. Vacuum Air Leaks

Vacuum Air Leaks

Vacuum air leaks occur for the leaks of intake manifold gasket. For this leak, air sucked in on the cylinder through the carburetor. Smallest leak on the intake manifold can cause a fuel-trim issue.

If you find one of the above symptoms I mentioned, check your car as soon as possible.

It needs huge time if you try to find the air leak only using your ears and eyes. It’s not as simple as finding an oil leak. You can also buy this cheap vacuum repair manual from any auto shop or online.

Here I mention some methods to find the air leak easily!

Possible Vacuum Air Leak Locations:

Method 1:

Method 2:

Method 3:


5. Air to Fuel Ratio

Air to fuel mixture ratio is one of the causes of faulty intake manifold gasket. It arises a negative impact on your engine performance. Your car engine will absorb more fuel than regular.

For the same driving time, you need to spend more money on gas. So, your car fuel economy will affect significantly.

Therefore, more air sucked in through the leaky coolant from faulty intake manifold gasket. It creates an inappropriate mixture. Inside the intake manifold, its air pressure is lower than our atmosphere.

When cylinder fills with the less fuel and more air from the normal then various problems occur with your car. Generally, it causes numerous backfires, failures and rough idling.

This video will help you to get more details about air fuel ratio.

So, What is Your Next Step?

You just find your car’s leak point. So, your next step is to fix all errors. You can easily do this at home. But if your problem occurs again, then you must need to go for gasket replacement as soon as possible.

Before fixing you need to follow some steps. They are:

Fixing a Coolant Leak

Fixing a Vacuum Air Leak

You can easily fix a small vacuum leak by using brake parts cleaner. You can use this stop leak product.

Actually, this not an easy task to find the vacuum leak and fix it properly. Inexperienced people will lose more time to find the exact place.

If your problem occurs again after doing this above steps, please contact a professional.

Intake Manifold Gasket Replacement Cost

Intake manifold gasket replacement cost is between $180 and $550. The labor costs are supposed from $160 to $430. The parts cost will be between $21 and $118.

This estimated price does not contain fees and taxes. You will need to consider this important issue. Moreover, this is not too much expensive replacement cost.

Final Words

Finally, you know every symptom of intake manifold gasket leak. By following our techniques, you can easily find the leak point. When there is a leak, it is essential to know what the reason. So, you can avoid this incident from happening again and again.

Hope you will enjoy our guide and it will solve your problems. If you have any question please leave a comment below!

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