Genuine Mitsubishi Sigma PCV Valve

Mitsubishi Sigma PCV Valve Parts Questions & Experts Answers

• PCV Valve
  MD104723
  Q: How does the PCV Valve in gasoline engines prevent combustion blow-by gases from entering the atmosphere on Mitsubishi Sigma?

  A:

  All Mitsubishi gasoline engines have a closed type crankcase ventilation system with a PCV valve threaded into the valve cover to prevent any blow-by gases entering the atmosphere. This system supplies fresh air to the crankcase by means of the air cleaner through a metered opening in the valve and the fresh air blends with the blow-by gases and then flows through the PCV valve to the air induction system. This system should be checked and cleaned after every five years or 50,000 miles, or earlier in case the vehicle starts to idle, then this system should be checked thereby eliminating the presence of other problems such as dirty fuel. To disassemble the PCV valve, unscrew it out of the valve cover with a wrench, and may disconnect the hose at the outer end to avoid over-twisting. Once the hose is re-connected, turn on the engine and hear a hissing sound when air flows in the valve; when you place a finger over the inlet, the vacuum should be strong. In case of failure in these tests, the valve should be replaced. Step 2 is to pinch the clamp attached to the hose to the PCV, slide it back and extract the valve. Blow out the threaded end of the valve; when the air can pass freely the valve is already working, otherwise, spray solvent is used to flush the valve or replace it because PCV valves cannot be serviced. Clean PCV hoses with a safe solvent; check to see if they have cracks or are stiff and replace them. Lastly, re-install old or a new PCV valve, taking care not to thread over the aluminum valve cover but not to over-tighten.