A bad positive crankcase ventilation (PCV) valve in a Dodge Dakota can cause a variety of problems. Not only will your engine lose power, but it will also rattle, shake, cough and generally sound very sick. Furthermore, your gas mileage will go down to the gallons per mile range, instead of the other way around. Understanding the effects of a bad PCV valve is the first step in correcting problems and returning your Dodge Dakota to smooth running.
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Loss of Gas Mileage
This is often the first effect of a bad PCV valve. Your gas mileage will go way down, and you have to fuel up way more often.
Loss of Power
Another significant effect is the loss of engine power. This is especially evident when you are trying to go uphill while accelerating. You engine feels like it has the performance of a lawnmower engine, instead of a regular engine.
Because the crankcase gases cannot escape, a back pressure builds up inside the crankcase. The engine then has to fight itself to run, and this results in a very rough idle.
Sputtering or Coughing
When you try to accelerate, an engine with a bad PCV valve sputters or "coughs;" it feels like the engine has stopped for a brief moment. Again, due to a back pressure build-up, the engine has to fight itself to run, and sputtering is the end effect.
Hesitation occurs between sputtering and a loss of power. It feels like sputtering, but lasts longer than just a brief moment. According to AutoZone, hesitation may an effect of a clogged or damaged PCV valve or clogged hoses that connect to the PCV valve.
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