The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Question on spark plug resistor and also rust on chrome

**'68OrangeSunshine** · 06-03-2020, 01:17 AM

That's a PCV valve. No relation to spark plugs. Pull it off the hose and shake it. If it rattles, it's OK. If no sound, replace. They're cheap. Under $5 in Lower 48. You may be able to clean up the old PCV by shooting it out with spray carb cleaner.

In the Positive Crankcase Ventiliation system, oil vapors from the engine block are vented out a one-way valve [the piece in question] and reintroduced into the carburetor to burn again, while cool, clean air from under the air cleaner is sucked into the valve cover to replace it.

I have used Flitz, a German metal polish, on rust on the grillle of my '71 Jimmy. In combination with steel wool, it should clear up. Follow up with a coat of wax to keep it from rusting again.

06-03-2020, 01:17 AM	#6
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,042	Re: Question on spark plug resistor and also rust on chrome That's a PCV valve. No relation to spark plugs. Pull it off the hose and shake it. If it rattles, it's OK. If no sound, replace. They're cheap. Under $5 in Lower 48. You may be able to clean up the old PCV by shooting it out with spray carb cleaner. In the Positive Crankcase Ventiliation system, oil vapors from the engine block are vented out a one-way valve [the piece in question] and reintroduced into the carburetor to burn again, while cool, clean air from under the air cleaner is sucked into the valve cover to replace it. I have used Flitz, a German metal polish, on rust on the grillle of my '71 Jimmy. In combination with steel wool, it should clear up. Follow up with a coat of wax to keep it from rusting again. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 06-03-2020 at 01:27 AM.