A bad positive crankcase ventilation valve causes various symptoms, including ignition of the check engine light. Other symptoms include odd noises from the engine or oil on the air filter element. More »

The symptoms of clogged arteries, or arteriosclerosis, depend on where in the body the arteries are clogged and the severity of the blockage, according to the National Heart, Lung and Blood Institute. Wherever it occurs,... More »

When a catalytic converter is clogged, you are likely to notice several symptoms, including a drop in your car's fuel efficiency, failure to accelerate properly and even your car not starting correctly. Many cars have da... More »

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When a positive crankcase ventilation, or PCV, valve goes bad, the valve may be plugged and can cause sludge to build in the engine, as well as oil leaks. A PCV valve can also go bad when there is water inside of it caus... More »

Symptoms of a failing fuel pump include increased fuel consumption, gasoline odor in the vehicle, reduced engine power and acceleration, engine stops running during operation, car is hard to start or won't start, check e... More »

A bad PCM, or power train control module, has a check engine light that does not turn off, an assortment of random codes, intermediate stalling issues and poor engine performance. The power train control module monitors ... More »

A faulty camshaft sensor results in numerous problems with a car, including an illuminated check engine light, a poorly running engine and difficulty or failure to start. The camshaft sensor replaces the distributor in m... More »