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Jeep Wrangler YJ
YJ General Discussion
Cleaning the CCV inlet without taking off the valve cover?
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<blockquote data-quote="machoheadgames" data-source="post: 438779" data-attributes="member: 18789"><p>Okay, wanted to make sure because it makes a big difference between 4.2 and 4.0. There is no PCV on the 4.0, it's all CCV. There are 2 CCV elbows, one of them has an orifice and one of them is free flowing. The front elbow should be free flowing, and the rear should have the orifice. With it being a 93 it could be the type of elbow that twist locks into the valve cover. On my 94, I just have circular grommets and the circular base of the elbows pops into the grommet and stays there.</p><p></p><p>If your post is about cleaning the "tower" going from the top of the valve cover down to the cylinder head (built into the valve cover), then that will be difficult to clean...</p><p></p><p>Basically the design is that the intake manifold pulls a vacuum through the valve cover to burn any unburned vapors floating around. The way to do that is to pull additional fresh air through the air filter, and then pull that fresh air through the valve cover so that air movement can happen through the intake manifold and into the combustion chamber. The rear elbow has the orifice so that the intake manifold doesn't get a massive vacuum leak through that elbow and run the rpm to redline. If you were to install a free flowing elbow in the rear location, your engine would go up to redline or close to it.</p><p></p><p>Also, thank you!</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 438779, member: 18789"] Okay, wanted to make sure because it makes a big difference between 4.2 and 4.0. There is no PCV on the 4.0, it's all CCV. There are 2 CCV elbows, one of them has an orifice and one of them is free flowing. The front elbow should be free flowing, and the rear should have the orifice. With it being a 93 it could be the type of elbow that twist locks into the valve cover. On my 94, I just have circular grommets and the circular base of the elbows pops into the grommet and stays there. If your post is about cleaning the "tower" going from the top of the valve cover down to the cylinder head (built into the valve cover), then that will be difficult to clean... Basically the design is that the intake manifold pulls a vacuum through the valve cover to burn any unburned vapors floating around. The way to do that is to pull additional fresh air through the air filter, and then pull that fresh air through the valve cover so that air movement can happen through the intake manifold and into the combustion chamber. The rear elbow has the orifice so that the intake manifold doesn't get a massive vacuum leak through that elbow and run the rpm to redline. If you were to install a free flowing elbow in the rear location, your engine would go up to redline or close to it. Also, thank you! [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Cleaning the CCV inlet without taking off the valve cover?
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