The Intake and Exhaust manifold are common sources of leaks.

As a result, The leak could be anything from;

  • Coolant leaking
  • Exhaust leaking
  • Oil leaking
  • Air leaking

A hissing noise or coolant leakage can mean trouble for your vehicle’s exhaust or intake manifold. Such signs can be symptomatic of manifold leaks. So, If you notice a manifold leak, it’s important to stop the leak immediately. A manifold leak can only be stopped if you’ve isolated the problem accurately. If you misdiagnose the cause for the leak then you risk prolonging the repair.  An accurate assessment is necessary for stopping a manifold leak. Also, It’s important to learn how to diagnose and troubleshoot the problems and locate the source of the leak.

Intake Manifold Leaks

There are two, perhaps three, places where an intake manifold can leak. All intake manifolds carry air from the carburetor or throttle body to the engine. The gaskets that join the three components can fail and allow unmetered air to go into the cylinder head. Many manifolds used on V-configured engines also contain a coolant crossover that carries coolant from the cylinder heads. This portion of the gasket is at least as likely to fail as any other. Also,  the end seals directly beneath the manifold can fail and allow oil to trickle out of the engine.

Intake Manifold Gasket Leaks
Intake Manifold Gasket Leaks

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Exhaust Manifold Leaks

Exhaust leaks can affect how your car runs or it can mostly just make your car’s exhaust louder. If the leak is occurring in the manifold gasket or the manifold flange gasket area, excessive heat can build up. This can quickly burn an exhaust valve, which will be an expensive repair bill. A leak farther downstream before the catalytic converter can trick the oxygen sensor into thinking the engine is running leaner than it really is. Consequently, This will cause the computer to dump more gas into the cylinders.

Exhaust Manifold Leaks
Exhaust Manifold Leaks

To complicate things, the intake manifold and the exhaust manifold both process automobile fuel or gases. Finally, One (the intake manifold) processes raw fuel, the other (the exhaust manifold) processes burnt fuel.