oil pushing out of intake
04-12-2010, 08:44 PM
#1
Burning Brakes
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oil pushing out of intake
Last week at Putnam Park I noticed oil on my rack and on the front of my engine. I looked for a leak didn't find anything. Then I noticed my silicone duct that goes to my throttle body had oil on the bottom. I checked my catch can and it had a little oil in it. I took off the silicone duct where the throttle body is and oil was standing in the throttle body and in the duct. The mass air flow sensor had oil all over it also. Yes the catch can is connected correctly. The car ran fine. I cleaned the mess up went out again and it did it again. Does anyone know what this could be? Is something blocked causing a back pressure of some sort? Thanks for any ideals and help.
04-12-2010, 09:28 PM
#2
oil is getting past the catch can. I had dual cans and had almost zero oil in them yet oil in my intake. Recently I built my own custom can and am getting lots of oil in the can with the intake dry. One thing that helps is to only vent the catch can(s) to the non-vacuum side of the air intake (t-body barb) and plug the manifold barb. With that engine vacuum is not used to assist drawing the oil into the motor.
04-12-2010, 11:09 PM
#3
Race Director
you should consider pulling your intake, and pulling the valley cover. On the bottom of it, there is a plastic air/oil separator that is glued and bolted on. If the silicon seal leaks, the oil separation function fails and oil is blown out.
Assuming you are talking about your 2004, there is no reason you should be pumping oil.
Assuming you are talking about your 2004, there is no reason you should be pumping oil.
04-13-2010, 06:20 AM
#5
Burning Brakes
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Its a 2004 Z06. Thanks guys for your advice I think I will get a new catch can and pull my intake then. David do you have any pics of this done on your site or is it pretty strait forward? Also while I'm under the intake is there anything I should replace just for PM?
Last edited by ssdeuce; 04-13-2010 at 06:22 AM.
04-13-2010, 07:20 AM
#6
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I've got the same thing on my 02Z. Catch can pretty clean. Oil on the front of motor and on trailer floor (I park on a significant downhill slope). Car runs fine.
04-13-2010, 09:17 PM
#7
Burning Brakes
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04-14-2010, 04:18 PM
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Burning Brakes
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04-14-2010, 05:24 PM
#11
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http://forums.corvetteforum.com/auto...e-learned.html
oil catch can section. change the variable orifice PCV to a fixed. make sure you PLUMB the can right, if you put the pcv in the wrong spot you can create issues.
oil catch can section. change the variable orifice PCV to a fixed. make sure you PLUMB the can right, if you put the pcv in the wrong spot you can create issues.
04-14-2010, 07:21 PM
#12
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Nathan, last weekend Danny mentioned the use of two catch cans. Not really sure how they are configured but I do intend to research some more. I know Dale is putting one on mine as we speak. Did you get a chance to catch up to Jason? I understand he makes a really good cup of coffee at his coffee house. 
04-17-2010, 01:32 PM
#13
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My engine use to drip oil out of the air bridge also. Here is an example of the setup I used to correct the problem:
Dual catch cans and a breather on your valve cover:
Both catch cans collect oil. One catch can goes into the PCV line. The second catch can attaches to the valve cover hose that normally goes to the throttle body. It is important that the inlet to this second catch can be HIGHER than the valve cover's hose outlet. If it's not, oil will siphon out of the valve cover and quickly fill the can:
After these changes, I have ZERO oil in the intake system.
Dual catch cans and a breather on your valve cover:
Both catch cans collect oil. One catch can goes into the PCV line. The second catch can attaches to the valve cover hose that normally goes to the throttle body. It is important that the inlet to this second catch can be HIGHER than the valve cover's hose outlet. If it's not, oil will siphon out of the valve cover and quickly fill the can:
After these changes, I have ZERO oil in the intake system.
Last edited by Pumba; 04-17-2010 at 01:35 PM.
04-17-2010, 06:10 PM
#14
Burning Brakes
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My engine use to drip oil out of the air bridge also. Here is an example of the setup I used to correct the problem:
Dual catch cans and a breather on your valve cover:
Both catch cans collect oil. One catch can goes into the PCV line. The second catch can attaches to the valve cover hose that normally goes to the throttle body. It is important that the inlet to this second catch can be HIGHER than the valve cover's hose outlet. If it's not, oil will siphon out of the valve cover and quickly fill the can:
After these changes, I have ZERO oil in the intake system.
Dual catch cans and a breather on your valve cover:
Both catch cans collect oil. One catch can goes into the PCV line. The second catch can attaches to the valve cover hose that normally goes to the throttle body. It is important that the inlet to this second catch can be HIGHER than the valve cover's hose outlet. If it's not, oil will siphon out of the valve cover and quickly fill the can:
After these changes, I have ZERO oil in the intake system.
04-20-2010, 07:37 AM
#16
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Lots of good stuff here. I just had the rear of my car way up in the air pulling the gas tanks and there is a large puddle of oil on the floor. Looks like I have more work to do.
04-20-2010, 09:39 PM
#17
Burning Brakes
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I am going to play it safe and take David's advice take a look under the intake. I also am going to buy a better catch can than the one I have. I'll let you know what I find.
