Can’t find Schrader valve

ANSWER : If air is getting to the valve but not coming out, odds are yes the valve is bad. Unfortunately there is no rebuilding kit for them. It most likely will have to be replaced then the entire system will need to be checked for any other leaks or faults.

ANSWER : Hi there. The PCV valve is located on bank 1; the valve cover closest to the cabin. It is usually found under the intake plenum towards the passenger side of the vehicle. The hose will be attached; or loose. Please understand that a code retrieval and an internet search is not a proper diagnosis as there are several other possibilities that can cause the code to set. Some of the possible causes could be spark plugs, ignition coils, intake manifold leaks, intake plenum leaks, vacuum hose leaks, failing airflow meter, failing O2 sensors, exhaust manifold leaks, low fuel pressure, failing ECU, faulty wiring harness, failing injectors, etc… As you can see, the list of possibilities runs on and on. This is where the expertise and experience of a qualified technician with the proper diagnostic tools and procedures becomes invaluable. I strongly suggest having a qualified technician perform an inspection to avoid replacing unnecessary parts and determine the exact cause of the code. Your Mechanic has several available technicians that can assist you with a check engine light inspection.

ANSWER : Hi there. Many Asian manufacturers do not use the valve in their fuel systems. They have opted to not include this as it presents a fire hazard should the valve fail. A proper fuel pressure test requires other adapters that typically have to be installed inline. What are your concerns for needing to test the fuel pressure? Do you have a no start concern? Drivability concern? Your Mechanic has a team of highly qualified and experienced technicians that can assist you with an inspection.

ANSWER : It is possible to temporarily seal air (vacuum leaks). Any method that best creates a seal can be used. In particular, RTV sealant which is flowable can be used to seal a non moving crack so long as the surface that you are applying the RTV to is oil and dirt free (otherwise the RTV wont bond). The only concern with such temporary (or even permanent) repairs is that you do not get any foreign matter in the engine through any crack that you are trying to seal. If you want the PCV valve and/or the valve cover replaced you can request PCV/valve cover replacement service and the responding certified mechanic will get this taken care of. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi there. Typically a sticking valve does not cause the VVT solenoid to fail, but it can increase vacuum pressure inside the motor that will lead to other timing related issues, which can trigger the same error codes.

Anytime you have a cylinder head hardware issue, or any other mechanical problems, it’s important to have a professional mechanic, such as one from YourMechanic, determine exactly why the Check Engine Light is on before additional damage occurs.

ANSWER : If you follow the large line that goes into the firewall connection to the evaporator in the engine compartment, you will see the high pressure connection on the small line, and low side connection on the right, on the larger line.

If you would like some assistance with this, a qualified mobile technician can come to your home or office to perform an AC recharge.

ANSWER : The valve cover bolt is tightened to 60 inch pounds.

ANSWER : Here are some websites I would recommend checking for parts:

Mercedes Parts Center
MB Online Parts
Get Mercedes Parts

Your VIN number should be located on the driver’s side of the windshield lower corner. You should also be able to find it in the door jam on the driver’s side. This number should contain 17 characters.