because the aortic valve is not functioning properly, i.e. prolapse
first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve and check the pintle inside the valve ports for excessive carbon deposits clean the valve ports and pintle with carburetor cleaner and replace the valve if idle does not improve replace the isc valve with a new one.
yes replace the PCV valve it cheep ,,
There are a variety of different methods to accomplish a heart valve replacement, ranging from a pig valve to prosthetic valve replacement. The cost for the prosthetic valve replacement surgery, as of 2011, was $78,000.
It is in the intake behind the throtle body. Simply pull it out and replace it.
First check to see if the valve for the water supply is turned on. If that isn't the problem you may need to replace the tank water valve, they do wear out and are not that expensive or difficult to replace.
The valve cover ask it, on a S 40 Volvo, can be replaced by first removing the valve cover. Remove the old gasket and replace with a new gasket.
You need to clean (or replace - $200) the idle air valve.
It's better to go ahead and replace it.
About $115. Labor $75 and valve $35. It takes about an hour. Most cars.
To replace the heater valve on a Volvo 940, first, disconnect the negative battery terminal and drain the cooling system. Then, locate the heater valve, which is typically found on the firewall near the passenger side. Remove the hoses connected to the valve, then unbolt it from its mounting. Install the new valve by reversing the process, ensuring all connections are secure, and refill the cooling system before reconnecting the battery.
The PCV valve on a 2004 Volvo S40 is located on the engine crankcase. It is a small rubber valve.
Oil starts to leak from the gasket. Generally it doesn't pose a problem to the engine unless you run it out of oil. It does make a mess, however, and they're not that expensive or difficult to replace.
Get a mechanic to do it. You obviously have no idea as to the complexity of the task. e.g valve stem seals, valve seats, warped head tolerances etc.
To replace the PCV valve on a 2000 Volvo S40, first, locate the valve, which is typically found near the engine cover. Disconnect any hoses and electrical connectors attached to it, then unscrew the valve from its mounting. Install the new PCV valve by reversing the removal process, ensuring all connections are secure, and finally, check for any leaks after starting the engine. Always consult your vehicle's manual for specific instructions and torque specifications.
When facing the engine, you'll notice two small fittings on either end of the valve cover. The PCV valve is the one on your left. Unscrew the plasic cap and replace the valve.
Valve clearance of Volvo f12, are set using a feeler gauge on the lash adjuster.