LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

help with pcv system please

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Old Dec 6, 2003 | 04:52 PM
  #1  
pelebkf's Avatar
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help with pcv system please

Okay I understand the basic concept of the pcv system but I was testing it the other day and I pulled out the value and there was a vacum sucking into the intake. Under normal logical sence should there not be a vacum sucking into the engine on the other side value cover? I took of the hose going to the tb and felt for a vacum there but nothing. Dose that mean that the pcv system is not working right?
Old Dec 6, 2003 | 06:41 PM
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Mtrhds94Z's Avatar
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From: Point Pleasant, NJ... USA
Your's is OK..
The PCV valve in the intake is the part that has vacuum[drawing from crankcase into the intake]
The psgr valve cover is the INTAKE for 'fresh air' TO the crankcase that is evacuated by the PCV valve into the intake[on drivers side]
The psgr valve cover hose feeds metered[by MAF] air from the TB TO the crankcase.. in theory, there should be as much vacuum there as at the PCV, but there may not really be much noticeable vacuum there.. [don't forget 'blowby', etc. feeds the PCV also..]
Old Dec 7, 2003 | 03:03 PM
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pelebkf's Avatar
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okay with that being said. Does that mean I have blowby in the engine and in't that bad???
Old Dec 7, 2003 | 04:34 PM
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All engines have some blowby.. do you have too much? hard to say...
Do a leakdown test, or when the oil cap is off does it 'puff' there noticeably?You are probably OK tho..
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