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valves

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How to Replace an Exhaust Gas Recirculation (EGR) Valve
The exhaust gas recirculation (EGR) valve can cause drivability problems if it fails and should be replaced to avoid engine performance issues.
How to Replace an Air Conditioning Expansion Valve (Orifice Tube)
Car air conditioning systems need the expansion valve, or orifice tube, replaced if the AC is blowing warm air or the AC system is broken.
How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
How Long Does a Vent Oil Separator Last?
The engine in your car can only run when the right number of controlled explosions are performed. During the explosions, there are a number of gases that are produced that will...
5 Commonly Overlooked Vehicle Maintenance Items
Brake fluid, auto transmission fluid, and coolant flushes, as well as cabin filter changes and valve adjustments, are all important services.
How to Replace an Air Pump Check Valve
The air pump check valve allows air into the exhaust system. It also prevents exhaust gases from reentering the system during a backfire or failure.
How to Clean an EGR Valve
The EGR valve is the heart of the emissions system on an engine. EGR is an acronym for Exhaust Gas Recirculation, and that is exactly what it does. This wonderful...
How to Change a Radiator Valve
A radiator valve allows coolant into the radiator in order to cool off the engine once the coolant has reached a certain temperature.
How to Inspect Valve Clearance Adjustment
The term “valve adjustment” is an oxymoron. What is actually being adjusted is the clearance between the linkage of the camshaft and...
How to Replace a Positive Crankcase Ventilation (PCV) Valve
A positive crankcase ventilation valve improves emissions in modern engines. Signs of PCV valve failure include oil leaks and poor engine performance.
How to Troubleshoot and Replace a Leaking Valve Cover Gasket
Valve cover gasket leaks usually start when not much oil leaves the engine. It should be repaired before it causes serious damage and costly repairs.
How to Replace a Car Combination Valve
The combination valve balances your brake system. If broken, it should be replaced to ensure a safe driving experience.
How to Replace a Vacuum Brake Booster Check Valve
Brakes are assisted by the vacuum brake booster check valve that fails when the brake pedal is hard to press, feels spongy, or does not work at all.
How to Replace a Power Steering Control Valve
Some common signs of a failing power steering control valve include a power steering fluid leak or the smell of burning power steering fluid.
How to Replace a Proportioning Valve
The brakes on the rear wheels may lock up when the brake is applied especially when surfaces are wet if the proportioning valve is failing.
How to Check an Idle Air Control Valve
Idle air control (IAC) valves regulate the engine idle speed. Engine idle speed is the revolution speed of the engine when the throttle is inactive.
How to Replace Your Car Idle Air Control Valve
The IAC valve, or idle air control valve, dictates your vehicle’s idle. A faulty valve can lead to rough idling and stalling, among other problems.
How to Replace a High Pressure Safety Valve
High pressure safety valves help the car engine run smoothly. Oil filter housings can burst if high pressure relief valves are stuck closed.
How to Replace an Air Diverter Valve
Car air diverter valves add clean air from the air pump to the emissions system to push out pollutants. Air valves are critical for car performance.

Related questions

Question
The check engine light and 2 other lights are illuminated.
Hello, thank you for writing in. The secondary air injection system opens and closes to allow fresh air to be sent into the exhaust system in order to reduce the amount of pollutants entering the atmosphere. The valve is controlled...
Question
Car is tapping
Occasionally, belt driven accessories are the source of noise so you can try to isolate all belt driven components by removing the serpentine belt and briefly run the engine. If the noise remains, a common source of tapping is the...
Question
shifting problems and the vehicle will not go backwards. Plus it will try to lunge forward in park.
Hi there. What could be the issue is the main valve to the transmission may have disconnected from the shifter lever on the side of the transmission. Raise up the vehicle and put it on four (4) jack stands. With...
Question
How much does it cost for Camshaft cover and Valve cover gaskets, parts and labor?
Billing question sent to CS for the cost of replacing the valve cover and camshaft cover gaskets with the cost of labor on a 2008 Mercedes-Benz CLK350 with a V6-3.5L engine.
Question
03 Saturn Vue has drive in every position even park no park gear or neutral
Hi there. It sounds like the main valve on the transmission is not functioning properly and it may be out of alignment keeping the transmission in gear all the time and not making the transmission want to shift into any...
Question
How will I know if it's my valve timing control? Will this mess with my vehicle wanting to start also?
Hi there. The valve timing controls are pressurized and operated electronically and engine oil pressure. First perform an oil change with a new filter to ensure a good clean engine. If the timing is still not right and the engine...
Question
How much to fix a leaking gas purge valve?
Billing question sent to CS for the cost of replacing the Evaporative Purge Valve on a 1997 Chevrolet Cavalier.
Question
Misfire happens at 1500 rpm's.
Hi there. Check the fuel injectors one at a time by disconnecting the harness and see if the engine stumbles or not. If the engine stumbles when the injector is turned off, then the injector was working. If the engine...
Question
cylinder number 4 has a misfire.
Billing question sent to CS for the cost to diagnose and repair a possible burned valve on a 2008 Jeep Commander with a V6-3.7L engine.
Question
I have to replace my IAC valve myself but don't know how to go about it.
Hi there. You will need the basic hand tools to remove engine accessories to access the IAC (Idle Air Control) Valve. The valve is located on the throttle body and is held on with either Allen head screws or Torx...
Question
I have a diagnostic trouble code P147d.
The code P147d is coming up for the fuel canister purge valve that could be sticking and not working properly. The purge valve is designed to control the emission's vapors in the fuel system. If the valve is not functioning...
Question
1992 Acura Legend, when the timing belt goes, is it common for the valves to bend?
If the timing belt break off, the engine's pistons will hit the valves as the pistons are moving. The engine is an interference engine and can cause damage to the internals of the engine. The last time the belt came...
Question
Tappet noise oud, rough idle 2009 Ford Focus
Hi there - the valve mechanism on your Zetec engine uses solid lifters (or cam followers to be more precise), and need to be adjusted periodically. As you mention, the delayed maintenance may not be helping here as well. I...
Question
Where is my pvc valvle located and how do I take it off and how hard will this process be?
The positive crankcase ventilation valve (PCV) is located in the valve cover, on the rear bank of cylinders. There is a tube that runs from the intake plenum to the valve, and is approximately 1/2 inch in diameter, that carries...
Question
Is it expensive to replace the valve seals?
The usual symptom for bad valve stem seals is bluish white smoke out of the exhaust pipe when the engine is started cold. The smoke usually clears after a minute and doesn't return again until the car is shut off...
Question
Replace Canister Purge Valve.
Billing question was sent to CS for the cost of labor to install a canister purge valve in the fuel system on a 2010 Ford Fusion with a 4L-2.5L engine.
Question
Valve cover gasket 2012 Ford F-150
Hi - Here at YourMechanic, click here for guidance on how to make this repair. There are many other aftermarket sources for information on how to replace valve cover gaskets: the factory Ford Service Manuals, vendors of aftermarket service manuals...
Question
Tail pipe sucks in at times, sucks in a dollar bill
If you have an engine that is running rough and misfiring and the exhaust is sucking in sometimes then you may have an exhaust valve that is sticking open. You should have a compression test to the motor. The valves...
Question
Engine cut while driving, now dont crank.Cant turn it with hand.
Of course, first confirm that the plugs are correct for the engine. The wrong plugs, and/or missing crush washers, can cause interference with the piston. If the plugs are correct, the cause of the mechanical interference can sometimes only be...
Question
Valve guide seals 2006 BMW 750i
Hello - unfortunately, this is not a service YourMechanic.com can offer at this time. Thanks for thinking of us though!

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