Generally speaking the symptom of a bad PCV valve is a buildup of pressure inside the crankcase. If it is bad enough it can cause the engine oil to come out through the dip stick tube. If you pull the dipstick out and hear a release of pressure that is probably an indication of a bad PCV valve. The common way to check the PCV valve is to take it out and shake it. If it has a rattle then it is supposed to be good, no rattle it is assumed to be plugged up and no longer working. I am not certain if that is still a valid check.
A bad PCV valve can cause the engine to smoke. The valve is easy to change in most engines to correct the problem.
The PCV valve is located on the top of the valve cover. To test the PCV valve, start the engine, pull the valve out of the valve cover and put your thumb over the hole in the end. If you hear a little click, then the PCV valve is good. If there is no vacuum at the hole, either the valve is bad or the hose is bad. To see if the hose is bad, pull the hose off and put your thumb over the end. If there is vacuum, replace the PCV valve. If not, replace the hose. It's important to note that PCV valves are sized for specific engine applications. The wrong PCV valve for an application can flow too much or too little air causing driveability problems.
put a new PCV valve in if it's bad.
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I have read that a bad PCV Valve will contribute to gunking up your Throttle Body, which could lead to irregular acceleration issues. I am certain that there is more to a bad PCV Valve than that, as this is an Emission Control item, but hopefully someone who knows more will chime in. SUBMITTED: Friday, 03JUN11
yes. if the valve is plugged or stuck closed, oil can be sucked into the intake through the pcv breather.
Bad PCV valve.
No, some rattle is normal.
Bad PCV Valve.- Your car would vibrate a lot and keep stalling. if you try to floor the pedal in gear, the car will move but, vibration is bad and you'll stall again.
Typical symptoms are oil leaks due to abnormally high internal pressures forcing oil past gaskets and seals.
Stuck or bad PCV valve on the Valve Cover to the carb or throttle body. The other is the EGR valve. Most likely the PCV.