Skip the auto shop - Our mechanics make house calls

Q: What Causes Cracks and Leaks on the Exhaust Manifold?

asked by on

What causes cracks and leaks on the exhaust manifold?

The exhaust manifold is designed to route exhaust gases away from the engine and into the rest of the exhaust system. A cracked exhaust manifold not only results in noise, but can also cause engine performance problems. This is because the oxygen sensors pick up the unmetered air entering through the crack and read it as a false lean condition.

Exhaust manifolds crack for a couple of reasons. For one, exhaust manifolds often crack due to the normal expansion and contraction that occurs as the engine is put through it’s normal range of operating temperatures. A cracked manifold can also be the result of a design flaw. Many modern manifolds have thinner castings designed to reduce weight. This makes them more susceptible to cracking.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. What Causes Cracks and Leaks on the Exhaust Manifold?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Sputtering and popping with a loss of power. Most recently died and after driving cat converter was cherry red hot.

Hi there. There could be an issue with the spark plugs not firing causing excessive amounts of hydro carbons (raw fuel) to go into the exhaust system. When excessive fuel goes into the exhaust system, the catalytic converter will glow...

Q: How much can I expect to pay in maintenance to cost over the next 5 years?

Hi, thanks for writing in. I'd be happy to provide my insight. Unfortunately, as you may know every car depreciates in value fairly rapidly relative to the amount you have paid for it. As with any car, the dependability is...

Q: Radiator Small Leak

Hi there. You may have a slow leak coming from the radiator side tank of the radiator. They will start to leak at only certain temperatures at first on the seals, then will start leaking more and more often. I...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...