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REMOVE PVC VALVE WITH VACUUM HOSE STILL ATTACHED CHECK FOR VACUUM AT PVC VALVE PLACING FINGER OVER IT.IF NO VACUUM FROM PVC VALVE BUT THE HOSE TO PVC VALVE HAS VACUUM REPLACE PVC VALVE.IF NO VACUUM GETTING THROUGH PVC HOSE AND VALVE.LOOK FOR DISCONNECTED BROKEN VACUUM HOSE OR OBSTRUCTION IN VACUUM HOSE BLOCKING OFF VACUUM.
The pvc valve will be located on the valve cover. Or better yet will be inserted into the valve cover. Follow the hoses coming from your air cleaner ( air filter) to the one that goes to your valve cover. Your pvc valve will be at the end of the hose. pvc valve can be tested by pulling it out of the valve cover while still attached to the hose. Start the engine. Place your finger over the pvc valve and pug it with your finger. If you feel vacume then it is working properly. If no vacume is present. Replace pvc valve
Where is the PVC valve? Standing in Front of the car it is on the left side of the air plenum.
Unscrew the oil filler tube and remove the plastic engine cover. There is a sensor on the left side of the plenum. This sensor senses when the PVC valve is open/closed. Don't bother disconnecting the connector or the piece the connector plugs into. Simply twist the whole plastic assembly clockwise = yes clockwise while pressing downward to release the assembly. There is a spring underneath so don't let it pop up. With the assembly out of the way grab the PVC valve with a pair of needle nose pliers, wriggle the valve out. If the o-ring is ok put it on the new PVC valve. Drop the valve in place making sure it seats on the o-ring. Look at the bottom of the assembly to see how the slots line up with the tabs. Slip the slots down over the tabs compressing the spring and twist counter-clockwise. Replace the plastic engine cover, Done!
If it does that when the engine is warmed up (full operating temp.) it may be you iac valve, or your fast idle valve. They get gummed up. It also could be your PVC valve, but probably not.:
IAC in red. Fast Idle in yellow. Your PVC valve is plugged into the valve cover (the black hose in between the red and yellow in the picture) it simply pulls out. It should rattle when shaken.
Hope this gives you a start on the problem.
I do not think it is the PVC valve. I could be the Idel air control vavle, the tps sensor (throtal postion sensor), and it could also be a vacume leak. Is the check engine light on? if it is then you need to run the codes to get a better idea of where the problem is. if not that does not mean that the computer is not picking up any codes. you should check the codes right after you experince the problem and you should run the koeo test. key on engine on test that will pick up any codes from the sensores while the engine is running. this is all asuming that you have a modern vehical that uses a computer. if your vehical is older and does not have a computer it could be a sticking float in the carb. or a few other posablitlys. What is the make model and year of your vehical ? with this information i will be able to give you a more definate answer
I've not heard that a malfunctioning pvc valve could allow most ALL of your oil to leave the engine. The PVC replacement is a regular maintenance item over the lifetime of the vehicle. It is important to check your oil level regularly, like at every gas fillup. Could it be possible the engine was already very low on oil?
Obviously you should change out the pvc valve immediately, change the oil and filter in the vehicle and check the drained oil for metal scrapings and other signs of damage.
My final suggestion is that you have a trusted mechanic check it out.
The PVC valve is located in the valve cover (top "cover" of the engine, near the oil filler cap) On DOHCs, it is immediatly to the right. On SOHCs, it a few inches to the left.The PVC valve is held to the valve cover with a rubber grommet type seat.
1. Remove the hose that connectes the throttle body unit to the PVC valve. 2. Using your hands, remove the PVC valve from the rubber seat. Wiggle it back and forth, then pull it straight out. 3. You can either clean this with carb cleaner, or simply replace it with a new one (<$5 at most auto stores) 4. Put the PVC valve back into the rubber seat and replace the hose