pcv Archives - UnderhoodService
PCV System DTC

PCV systems are far more complex now, but they are also much better at controlling crankcase pressure.

10 Alternative Uses For A Smoke Machine

Don’t limit yourself to just checking emissions controls – use your smoke machine to check numerous vehicle systems.

Diagnosing Positive Crankcase Ventilation Leaks

The PCV system prevents crankcase blowby vapors from escaping into the atmosphere by capturing the vapors, separating the oil and directing them into the intake manifold so they can be burned in the engine.

VIDEO: Why Checking The PCV System is Critical to Curing Gasket Leaks

Andrew Markel explains how a gasket that comes in contact with crankcase vapors can cause an oil leak, and how you can test pressure and vacuum with the right tools. Sponsored by MAHLE.

Turbocharging: Managing Pressure In The PCV System

Crankcase vapors are routed through the positive crankcase valve (PCV). The PCV valve is a simple spring-loaded valve with a sliding pintle inside. The system allows the vapors to be siphoned into the engine using engine vacuum.

VIDEO: Gasoline Direct Injection (GDI) Carbon Deposits And The Synthetic Oil Connection

Conventional oil that has high volatility will cause more vapors and make carbon deposits worse. Synthetic oil with low volatility can reduce vapors and prevent carbon from forming on the valves. Sponsored by Auto Value and Bumper to Bumper.

PCV Valve Facts

The first vehicle to get a positive crankcase ventilation (PCV) valve was the M5 Stuart tank in WWII, which was made by Cadillac. The valve replaced draft tubes that might suck water into the engine while crossing rivers.

PCV valve
Making Money with Mode $06

Nothing is more frustrating than “fixing” a customer’s vehicle and then have it come back a few days or weeks later with the check engine light on and the same fault code or a new fault code. You look bad, lose your customer’s confidence in your ability to fix their vehicle, and in states that

Mode 06 diagnostics
10 Signs A Fuel Injector Needs To Be Replaced

In the past 30 years, the fuel injector has moved from the intake manifold to the combustion chamber. During this evolution, injectors have become more precise in dispensing fuel. If this precision is thrown off by restrictions, electrical problems or fuel problems, it can cause driveability issues. These are the top 10 signs fuel injectors need service or replacement.

JASPER Offers Remanufactured Toyota 1MZ-FE 3.0L DOHC Engine

Jasper Engines & Transmissions announces the availability of its remanufactured Toyota 1MZ-FE 3.0L engine. This DOHC V6 engine is available on exchange for the following 1994-2006 vehicles: Toyota Camry, Avalon, Solara, Sienna and Highlander; and Lexus ES300 and RX300.

Intake Manifold Gaskets: A Service Rundown

Back in the days when most

Diagnostic Solutions: Direct Fuel Injection Systems

For veteran technicians, it’s no wonder that the internal combustion engine (ICE) has been pronounced “dead” on more than one occasion. After having gone through the gas turbine craze during the early 1960s and the rotary engine fad of the 1970s, it comes as no surprise that we’re witnessing still another resurrection of the reciprocating internal combustion engine in the form of gasoline direct fuel injection.