I got a cold air intake for the dodge neon, and the crankcase hose doesnt have a place to go into the cai, what can i do with the hose or will i have to modify the cai to fit the crankcase hose too?
my guess is your talking about the hose for the pcv system. just lose the hose and get yourself a breather for your valve cover or wherever that hose comes off of.
You might get 1mpg extra if it is set up properly; which means you must find a way to NOT suck in hot air radiated from the engine. You accomplish this with a heat shield (you can fabricate your own; search for it or e-mail me for more info) or by placing your Cold Air Intake in a location where it will pull cold air from outside the car. if you do this, though, be CERTAIN that water can not get into it- otherwise, you can hydrolock your engine, which will make it unusable. Also, you will improve throttle response and might see a gain of a couple horsepower.
The hose you are speaking about, which I assume is the one which runs from the valve cover into the air cleaner, is designed to vent the engine crankcase during full throttle when the engine intake vacuum is too low to operate the PCV valve. While a pressurized crankcase is not a good thing, I doubt any harm would come from short duration, intermittent flooring it, followed by suddenly releasing the throttle, returning high vacuum to the intake manifold and actuating the PCV valve. Frankly, I would ask the CAI manufacturer how you are supposed to vent the crankcase without this fitting. If they say oh, you don't need that!, go somewhere else for your CAI.
