You wanted to regulate the flow of crankcase fumes into the intake manifold where they can efficiently be burned. But you might have been missing your Geo PCV valve which is ought to perform such task. Way back in 1963, vehicles had no PCV valves and used road draft tubes instead. This allowed the hydrocarbon emissions from the crankcase out into the open air. Significantly, if your Geo isn't endowed with a PCV valve yet, it's now time to consider having one. Besides its primary role, a Geo PCV valve is also able to prevent emissions to flow back into the engine backfire, preventing then potential burning of the crankcase fumes. In addition, the whole Geo PCV system is crucial for the proper engine sealing. Without the presence of the PCV valve, pressure in the crankcase will increase. This will push the seals and gaskets out with more force which could more easily cause leaks. And so, never neglect the PCV valve of your Geo when doing maintenance check. Bringing your automobile to professional mechanic regularly for thorough inspection is also wise. If in case your existing unit is already damaged, make sure to obtain only the one that can assure you and your vehicle of reliably long service. You'll know that you're getting a faulty PCV valve when there's the presence of oil leak, and if the whole PCV system isn't operating correctly which is indicated by greater crankcase pressure. This is best noticed when the valves are blown already. But that shouldn't have to happen. With the use of the reliable aftermarket Geo PCV valves available here at our online auto parts and accessory store, you'll get the product that'd guarantee you durability. Clicking on this site is all it takes to get started in your search of the finest Geo PCV valve.