The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - no vacumn to PCV valve,unidentified oil leak at intake.

dwaite72lnghrn · 06-24-2010, 07:25 AM

The port on the carb should have vacuum all the time if it is below the bottom plates. The other sources on a stock manifold would be a tap between the carb and dizzy for the vacuum accs. and auto trans. Put your finger on the end of the hose going to the engine and rev it up and see if vacuum is there when you rev it.
If you have blowby the oil is from the engine being blown out the PCV hose onto the engine.
In the picture it looks like your power brake booster is in the manifold tap.

06-24-2010, 07:25 AM	#2
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	Re: no vacumn to PCV valve,unidentified oil leak at intake. The port on the carb should have vacuum all the time if it is below the bottom plates. The other sources on a stock manifold would be a tap between the carb and dizzy for the vacuum accs. and auto trans. Put your finger on the end of the hose going to the engine and rev it up and see if vacuum is there when you rev it. If you have blowby the oil is from the engine being blown out the PCV hose onto the engine. In the picture it looks like your power brake booster is in the manifold tap. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne