 Oil in Intake Plenum, PCV or ??? |
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| Nozzle |
 Jun 21 2013, 03:48 PM
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#1
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Member  Group: Members Posts: 158 Joined: 6-November 08 From: Lexington Park, Maryland Member No.: 9,725 Region Association: MidAtlantic Region  |
While trouble shooting idle stability issues I pulled the throttle body and found what looks some kind of fluid pooling in the bottom of the intake plenum. Engine is a completely stock '73 2.0 D-Jet with all EFI components and hoses installed.
Here's a before picture:  And here's what it looked like after a ~40 mile test drive:  The fluid looks green tinted like the Brad Penn I run in the engine and smells like oil/fuel so I'm assuming it's oil. Before the test drive I disconnected the Cold Start Valve just to make sure it couldn't be raw fuel from a leaking valve. I had also cleaned the PCV as well as I could. The PCV unit is at least 25 years and 25K miles old but I can't find a replacement anywhere. Vacuum lines are about 4 years old and seem to still be in good condition. Questions; Is this oil pooling normal? If not what can I do about it? Thanks, John |
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| SLITS |
Jun 21 2013, 04:53 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
The PCV valve on the oil filler assembly is attached via hose to the stacked elbow on the plenum on a '73. You can look at:
1.) The PCV valve is not operating correctly as the valve inside is not restricting vacuum. 2.) You overfilled the engine oil 3.) The engine is worn and there is a lot of blow-by. You could hook the hose to the air cleaner to lessen the vacuum effect. This I have seen done on a lot of cars either on purpose or in error. |
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| r_towle |
Jun 21 2013, 05:54 PM
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#3
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Custom Member Group: Members Posts: 24,576 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Option 1 and 3
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| Nozzle |
Jun 22 2013, 09:25 AM
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#4
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Member Group: Members Posts: 158 Joined: 6-November 08 From: Lexington Park, Maryland Member No.: 9,725 Region Association: MidAtlantic Region |
The engine has about 30K miles on the rebuild so I'm thinking (and hoping) it's not time for another. If that is the case, does anyone know a reliable source for a new PCV unit?
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| 914itis |
Jun 22 2013, 10:06 AM
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#5
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Advanced Member Group: Members Posts: 2,892 Joined: 9-October 10 From: New York City Member No.: 12,256 Region Association: North East States |
QUOTE(Nozzle @ Jun 22 2013, 11:25 AM)  The engine has about 30K miles on the rebuild so I'm thinking (and hoping) it's not time for another. If that is the case, does anyone know a reliable source for a new PCV unit? (IMG:style_emoticons/default/popcorn[1].gif) |
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| McMark |
Jun 22 2013, 10:49 AM
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#6
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Porsche.
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| r_towle |
Jun 22 2013, 11:08 AM
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#7
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Custom Member Group: Members Posts: 24,576 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Compression test and leak down test will tell you how much blow by you may have.
If you are pushing oil into the intake, you may have too much crank case pressure. Lots of ways to vent the crank case, so it may just require some work on that side first. Go for a new PVC valve first. Rich |
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| 914_teener |
Jun 22 2013, 03:00 PM
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#8
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914 Guru Group: Members Posts: 5,198 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Mark....these are available from the factory?
I called Rusnak in Pasadena a couple of months ago and was told NLA. |
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| Nozzle |
Jun 22 2013, 03:34 PM
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#9
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Member Group: Members Posts: 158 Joined: 6-November 08 From: Lexington Park, Maryland Member No.: 9,725 Region Association: MidAtlantic Region |
Unfortunately I was told they were unavailable at Porsche of Arlington in DC as well. Has anyone found PCV replacements at dealerships?
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| type47 |
Jun 22 2013, 06:23 PM
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#10
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
look for part number 022 115 451 B and don't be surprised if the part is called a bleeder or bleeding (IMG:style_emoticons/default/biggrin.gif)
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