The inlet manifold gasket (also called the intake manifold gasket) seals the connection between the intake manifold and the engine. It ensures that air and fuel are delivered to the cylinders without leaks. Over time, the gasket can wear out, crack, or fail, causing vacuum leaks, poor performance, and coolant or oil leaks in some engines. Replacing a faulty inlet manifold gasket restores engine efficiency and prevents further damage.

What is an inlet manifold gasket replacement?

This service involves removing the intake manifold, cleaning the mating surfaces, and installing a new gasket. The mechanic will also check for damage to the manifold itself and inspect related seals, hoses, and sensors.

Why do you need an inlet manifold gasket replacement?

A leaking gasket can cause unmetered air to enter the engine, leading to rough idling, poor fuel economy, and loss of power. In engines where coolant flows through the manifold, a failed gasket can also lead to coolant leaks and overheating.

Common signs you need an inlet manifold gasket replacement

• Rough idling or engine misfires
• Poor acceleration or reduced power
• Decreased fuel economy
• Coolant leaks near the intake manifold
• Check Engine Light illuminated
• Hissing noises from the engine bay (vacuum leaks)

What happens during an inlet manifold gasket replacement?

A mechanic will:

1. Inspect the intake manifold and gasket for leaks or damage
2. Drain coolant if required (for coolant-passing manifolds)
3. Remove the intake manifold and old gasket
4. Clean and prepare the sealing surfaces
5. Install a new gasket and refit the intake manifold
6. Reconnect sensors, hoses, and wiring
7. Refill coolant if necessary and test the engine

How much does an inlet manifold gasket replacement cost?

Inlet manifold gasket replacement typically costs $400–$900. Costs may be higher if the manifold itself is cracked or if additional components such as sensors or hoses need replacing.

Is it unsafe to drive with a bad inlet manifold gasket?

Yes. A leaking intake manifold gasket can cause poor performance, stalling, overheating (if coolant is involved), and further engine damage if ignored. It should be replaced promptly to avoid more expensive repairs.