V70 PCV problem-
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V70 PCV problem-
I have an oil trap box issue causing pressure coming out of my filler cap and dipstick tube. I found a broken suction line that goes on the end of the intake manifold near the PS pump- I cut the end off and reattached and now the suction is collapsing the line (it is definitely spongy and old) -so I am guessing there IS a blockage there. I guess my question is where does that tubing go? I think it goes to the oil trap box but as you know all that is well hidden and you cannot find a clear complete diagram of the hose routing online. (or maybe I can't read them correctly!)
I was going to try to clean that out with some carb cleaner and some monofilament trimmer line. Also maybe replace part of that line? Anyone have any further advice? The oil stays clean and the car has been maintained well other than this issue. If I had the money I would do the complete replacement but I am trying to avoid that!
I was going to try to clean that out with some carb cleaner and some monofilament trimmer line. Also maybe replace part of that line? Anyone have any further advice? The oil stays clean and the car has been maintained well other than this issue. If I had the money I would do the complete replacement but I am trying to avoid that!
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Joined: Dec 2008
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Year?
I found this on a new-to-me engine once.
Don't clean the parts, REPLACE THEM.
I found with the older engines, even with new PCV parts, it is not enough. The stock PCV pipe from the separator to the intake is severely undersized for an older engine. Also, the hole at the heating element at the PTC valve is tiny, like smaller than 1/4 inch tiny. Both will restrict the flow of the crankcase gases.
To address those issues, here is what I do. Get the below parts.
A 3ft 5/8 oil compatible hose. Do not use silicone hose, as it will "sweat" oil. Do not use heatercore hose, it is not rated for oil, it will become soft and you'll have to replace it sooner. This is what I use. Buy 3, as it is sold by the foot.
10 An Push Lok Loc Lock Hose Oil Coolant 5 8? Black 250 P s I Industrial Hose | eBay
One 3/4 elbows from your local hardware store. (5/8 will be the wrong size!)
A 3 feet 3/16 vacuum hose to replace the small hose from the intake manifold to the PTC valve. I prefer silicone hose for this.
Optional, get 6 of this. I like their clamps.
https://www.ipdusa.com/products/4768...4mm-12mm-width
Optional, wireloom to protect the hose.
Take a unibit and drill out the PTC valve holes to as big as you feel comfortable. I think I drilled mine out to about 1/2 inch.
Remove the intake manifold and replace that stock PCV hose, I cut a short hose and then use a 90 degree elbow, than a long hose to the PTC valve. Replace the vacuum hose to the intake manifold to the PTC valve with the new one. Then reinstall the intake manifold.
All the crankcase gas have to go thru that tiny PTC hole!!!
Installed on car
I found this on a new-to-me engine once.
Don't clean the parts, REPLACE THEM.
I found with the older engines, even with new PCV parts, it is not enough. The stock PCV pipe from the separator to the intake is severely undersized for an older engine. Also, the hole at the heating element at the PTC valve is tiny, like smaller than 1/4 inch tiny. Both will restrict the flow of the crankcase gases.
To address those issues, here is what I do. Get the below parts.
A 3ft 5/8 oil compatible hose. Do not use silicone hose, as it will "sweat" oil. Do not use heatercore hose, it is not rated for oil, it will become soft and you'll have to replace it sooner. This is what I use. Buy 3, as it is sold by the foot.
10 An Push Lok Loc Lock Hose Oil Coolant 5 8? Black 250 P s I Industrial Hose | eBay
One 3/4 elbows from your local hardware store. (5/8 will be the wrong size!)
A 3 feet 3/16 vacuum hose to replace the small hose from the intake manifold to the PTC valve. I prefer silicone hose for this.
Optional, get 6 of this. I like their clamps.
https://www.ipdusa.com/products/4768...4mm-12mm-width
Optional, wireloom to protect the hose.
Take a unibit and drill out the PTC valve holes to as big as you feel comfortable. I think I drilled mine out to about 1/2 inch.
Remove the intake manifold and replace that stock PCV hose, I cut a short hose and then use a 90 degree elbow, than a long hose to the PTC valve. Replace the vacuum hose to the intake manifold to the PTC valve with the new one. Then reinstall the intake manifold.
All the crankcase gas have to go thru that tiny PTC hole!!!
Installed on car
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Joined: Dec 2008
Posts: 461
Likes: 0
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