Bent Valve Bad PCV How to do a Leak Down Test. Posted: April 28, 2025 | Last updated: July 11, 2025. More for You. Donald Trump gives Republicans ultimatum over PBS, NPR funding.

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace ...

When the PCV valve starts to malfunction, signs or symptoms will show to alert the car owner. Be sure to look out for symptoms of a damaged PCV valve. A bad PCV valve on an internal combustion engine ...

Cleaning the PCV valve on his Tucson, Paul thought this would help fix the problem. Another Blackstone oil test showed this didn't fix things, nor did a GDI cleaning service done at the dealer.

That is, the engine either has too little fuel or too much air entering it. It's actually quite common on this engine and can be traced to several possible causes. Some of those include bad fuel ...