5 Symptoms of a Bad Intake Manifold Gasket (and Replacement Cost)

A gasket is basically a seal which goes in between various components of the engine. This seal can be made from metal, paper, rubber, or a combination of them. However, there is no gasket more important to the engine than the intake manifold gasket.

This particular gasket goes in between the cylinder head and the intake manifold in order to provide a seal there. As you may know, the intake manifold is responsible for delivering the mixture of air and fuel to the cylinders.

So, if there is a problem with the intake manifold gasket and it is unable to properly seal these two components, then you could have major problems.

Bad Intake Manifold Gasket Symptoms

1) Coolant Leaking

In some cars, there are intake manifold gaskets which also serve as a seal for the coolant of the engine. Naturally, if this seal were to be worn out or damaged, then coolant fluid will be able to seep through the seal and leak out.

You will know when this is happening because the smell of coolant will be in the cabin and it is a very distinct smell. If it gets really bad, then you might even see steam and puddles of coolant from under the vehicle.

2) Engine Stalling

When the engine stops turning or is turning too slowly, then stalling will occur. This can happen when a faulty intake manifold gasket causes a vacuum leak, which messes up the ratio of air to fuel.

Then you could be driving and all of a sudden experience a stalled engine. Of course, there could be many other reasons for a stalling engine, but a bad intake manifold gasket is surely one of them. Go see a mechanic to have them verify if it is this gasket or not.

Read also: 5 Symptoms of a Bad EGR Valve and Replacement Cost

3) Overheated Engine

An overheated engine is a continuation of the coolant leaking problem. If your bad intake manifold gasket has caused a coolant leak, then the coolant is going to get into the intake manifold. Once this happens, your engine will eventually overheat.

You may not even see any visible leaks coming from your vehicle on the outside. But you will know if your engine is overheating because it will show on your dashboard.

4) Bad Fuel Economy

Since a faulty intake manifold gasket causes a disruption in the air to fuel ratio, then your engine is going to consume more fuel than normal.

This means you will be spending more money on gas for doing the same amount of driving that you normally do. As a result, your fuel economy will decrease greatly.

5) Loss of Acceleration

Aside from an engine stalling, you may notice a simple loss of acceleration after you step on the gas pedal. You may get a little bit of power at first, but then the acceleration will stop and start again as you keep your foot on the pedal.

You obviously shouldn’t continue to drive your vehicle when it is in this condition since it’s dangerous to do so. If you are experiencing two or more of the other symptoms, then you definitely need to have your intake manifold gasket replaced promptly.

Intake Manifold Gasket Replacement Cost

The replacement cost of an intake manifold gasket is anywhere from $190 to $540. The cost of the labor will be anywhere from $170 to $420. The cost of the parts will be from $20 to $120.

On top of these costs, you will need to worry about the additional fees and taxes too. Overall, though, this is not an expensive replacement job and it should be affordable for most drivers to get done.

14 thoughts on “5 Symptoms of a Bad Intake Manifold Gasket (and Replacement Cost)”

    • P4020 signifies a problem with your catalytic converter. Technically, a leaking intake manifold gasket could cause a cat converter failing if coolant leaked into the exhaust but it’s pretty unlikely.

      Reply
  1. Help! I have a 2004 Nissan Altima and it’s just been one problem after another since acquiring it. I just had my boyfriend replace my intake manifold gasket because it sounded like a go cart when I was driving it. After replacement my car keeps shifting poorly and losing power. I can’t drive over 50mph because the RPMs are so high and it behind to lose power on its own. I put a code reader on it and I’m getting P0732, P0300, P0301, and another P0732. I have replaced so many parts in this car. Please tell me what you think it could be!

    Reply
    • Shows you have a misfire on cylinder 1 and incorrect ratio in gear 2. Check transmission fluid level and condition and possibly new plugs. If the throttle body is messed with, it may require reprogramming.

      Reply
  2. Is $900-1000 reasonable for parts/labor for spark plugs, valve cover gaskets and intake manifold gasket for 2007 Ford Freestyle?

    Reply
  3. I have 94 chevy Silverado with a 305 engine. I had my intake gasket replace. the mechanic drilled on my intake to adjust the idle. could this have messed up something? now when I drive it there is a knocking noise when I accelerate. I am afraid to drive it so I don’t do further damage. any advice?

    Reply
  4. I have a 2000 chevy s10 that stops just short of overheating when I drive (short distances, less than 10 min) and the heat won’t work. I brought it to a shop and they ran a diagnostic and said it would be over $800 to fix the manifold gasket. Does the conclusion and price sound right?

    Reply

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