Genuine 1992 Toyota Land Cruiser PCV Valve

1992 Toyota Land Cruiser PCV Valve Parts Questions & Experts Answers

• Q:

  What Is the Role of the PCV System in Reducing Hydrocarbon Emissions and How Do You Inspect and Replace the PCV Valve for the 1992 Toyota Land Cruiser?

  Posted by Yecheng L.

  A:

  The Positive Crankcase Ventilation (PCV) system is very important in minimizing output of hydrocarbon into the atmosphere; crankcase vapour is channeled from the crankcase, fresh air from the air cleaner is drawn into the crankcase and mixed with blow-by gases then passed through the PCV valve then to the intake manifold. Components that require regular inspection are the PCV valve, fresh air intake and vacuum hoses that connect the above to the engine. For maintaining its idle quality, the PCV valve will, therefore, limit the amount of flow under conditions of high intake manifold vacuum but it will return excessive blow-by gases to the air cleaner at times which may be as a result of bad piston rings. This system could mean that there would be accumulation of the oil deposit around the Throttle plate and it would therefore be advisable to clean it frequently. To verify this, ensure you take the valve out of the grommet in the valve cover then shake it; a rattling sound means that it's not clogged. If all fails, it must rattle and replacement is required. If the engine is running, putting a finger over the valve opening should draw vacuum; lack of vacuum means a faulty valve or plugged hose or both and a search for leaks where the valve is situated, filler cap, and hoses. For replacement, lift the valve upwards and remove it from the slot and carry out check up on the rubber grommet to see whether it is damaged or not. If the valve is blocked, the hose most likely is too, and both elements must be taken out and washed with solvent. After rinsing, check the hose for any signs of wear or tear and another important thing is that the hose should have a tight seal on the fittings. Only where necessary should one fit a fresh PCV valve and fit the fresh clean PCV hose securely.

  Answered by Toyota Parts Specialist Jerry / Apr 19, 2025