Symptoms of an intake manifold gasket leak include poor engine performance, engine overheating and coolant leaks. The leak allows additional air to mix with the fuel-air mix, causing the engine to run lean. On vehicles with onboard diagnostics, the leak often causes the check engine light to illuminate.Know More
The air pressure inside the intake manifold is lower than the atmosphere. This vacuum pulls a precision mix of fuel and air into the manifold, which distributes it to the cylinders through valves. The leak affects the air-to-fuel ratio, so the cylinder fills with more air and less fuel than normal. The car idles roughly, misses and sometimes backfires.
The intake manifold also directs the coolant through the engine block. Leaks in the manifold allow coolant to mix with the motor oil or leak from the engine. Motor oil takes on a milky appearance when mixed with water. Brightly colored coolant leaks are often apparent on the ground under the vehicle. As the coolant leaks from the engine, its cooling system becomes less efficient at moderating temperature and the engine overheats.
On vehicles with onboard computers, sensors constantly monitor the performance of the engine. These sensors indicate problems with engine performance to the diagnostic center, which warns the driver by illuminating the check engine light.Learn more about Car Parts & Maintenance
A leak on an exhaust manifold can be welded, or depending on the severity of the damage, result in having the unit replaced. Small cracks are patchable, but large cracks require more extensive repair.Full Answer >
Intake manifold torque specifications are available online at BoxWrench.net, Torkspec.com and Edelbrock.com as of 2015. These sites provide torque specifications for multiple automotive parts, makes and models.Full Answer >
The cost to fix an intake leak on a car can range anywhere from around $150 to $600 or more, depending on the vehicle. A leak in the intake manifold not only contaminates the engine oil but can also cause damage to the engine itself.Full Answer >
The proper way to repair an exhaust manifold leak is to use a piece of sheet metal and weld it onto the damaged area. A cracked manifold will continue to grow in size if not repaired properly and promptly.Full Answer >