Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: I need some input on a water problem with a YJ
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I took the hose to the air cleaner and extended it. Ran it down the side of the motor, like the old road tubes.
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That can do more than cause apoplexy with the EPA gendarmes.
The road tubes were more properly called "road draft tubes" because the forward motion of the car produced a low pressure at the bottom of the tube, creating a draft which pulled blow by out of the engine, and clean air in through the oil filler cap, which had a filter in it.
With a PCV system, the flow is from the air cleaner through the hose into the engine, and from the valve cover through the PCV valve and into the intake manifold.
At high throttle openings, the blowby can overwhelm the PCV valve, and the excess goes out the intake hose to the air cleaner, which is causing your problem. But at other times that hose you've run down to the bottom of your engine is sucking unfiltered, dust-laden air straight into the valve cover.