352 PCV Help
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352 PCV Help
Hey, I gotta 67 352 2bl. The PVC hose collapses when running. It's got a new PCV valve & it rattles when I shake it. The hose also is wet with oil. I am new to this, so any pointers will be helpful. Thanks in advance. I will check back later.
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OK, went to parts house & got a "molded" hose & it collapses also. I removed the oil filler side & get a slight vacuum while running when I put my hand over the hole. Getting a good vacuum through hose & pcv valve side. Could there be a blockage some place. Also, I saw a pic of a 390 that looked as if there were a metal tubing going to the pcv valve.
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I've never run metal tubing on my PCV's and I only had one hose collapse and it was soft as butter. Does the hose stay collapsed when you remove the breather on the other valve cover? How about when you pull the valve out of the valve cover?
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Sorry about my last post, after reading it I need to make it more clear. The PCV hose stays collapsed. With the truck running, Hose in my hand & pcv valve in the end of the hose, I can see the pcv valve close & stay closed.
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While I don't think the hose should collapse, the pcv valve itself is closed at high vaccum conditions (like idle). So the pcv valve sounds like it's working correctly.
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I replaced the 3 month old valve with another new one & get the same results. They both look good. They both rattle when shaking. They both have a sping in them that I can push in with a screwdriver, then they return. Both PCV's appear to be good. As stated earlier both PCV's, with truck idling pull the valve close & collapse the hose. I guess this would be considered alot of vacuum? Is this a bad thing? As far as I know it's all stock & def has a 2bll with more than crappy stock exhaust.
Post Fiend
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From: Union, Washington
With the engine running at idle the PCV should not be pulled closed by the vacuum, ever. At idle the should pass air you should be able to put your finger over the open end of the valve and the vacuum should hold it there. Are you sure the guy is giving you the right PCV?
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Originally Posted by bertha66
Is your PCV pluged into the base of the carb? I'm wondering if the carb gasket is bad between the venturies and the port going to the PCV.