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
Symptoms of a bad catalytic converter in a Dodge Dakota, or any vehicle, include exhaust issues and poor performance. Drivers also notice an offensive smell coming from the vehicle, similar to rotten eggs or sulfur.Full Answer >
Fuel injector issues can become apparent with many different symptoms including problems with the car starting, idling problems, a failed emissions test, generally poor car performance and an inability to reach high revolutions per minute, or RPMs. Two major problems exist with the fuel injector. There are bad, faulty, clogged and leaking fuel injectors, which generally cause a decrease in performance, and a leaking fuel injector, which can cause fuel odors within the vehicle as well as poor performance.Full Answer >
Tapping noises from the engine compartment of a minivan lasting more than a minute but dissipating once the engine is warm are normally from leaks in the exhaust manifold. A tapping noise that lasts just a few seconds on startup is usually due to malfunctioning valve lifters, according to Auto Repair Help.Full Answer >
A car's purge valve is a mechanism that directs the vapors emitted by the engine fuel from the fuel tank to the intake manifold. The purge valve also stores the fuel vapors for future combustion, allowing it to be recycled back into the engine combustion process when needed.Full Answer >