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Old 04-09-2015, 01:24 PM
luzer luzer is offline
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Re: idle issues, car wants to stall

Quote:
Originally Posted by m00 View Post
cold air intake made up of a bunch of PVC pipes, I'll post a pic when I can

edit:

here is my engine bay. it may be correct that air is leaking out as the intake is made up of PVC pipes, I'll have to experiment a little

That intake shouldn't have any effect on your idle. It's basically the same thing that the stock intake is, assuming the filter is in the stock location. If you look at a stock intake, you'll see that there are small holes in it to allow moisture to drain out. It won't matter if the pvc section of your intake has any leaks in it, as the filter is after that section of the intake. The intake is stock from the filter to the throttle body. And many people run just that portion of the intake tube and just stick a filter on the end. The intake isn't causing your problem. I'm surprised your Honda tech suggested this is causing your problem.

As far as the PCV valve discussion goes, the purpose of that valve is to recirculate blowby gasses back into the induction system to be burned off. It was the first attempt at emissions control, and dates back to the early 60's. There is not normally vacuum in the valve cover, as it is vented straight through to the crankcase. The PCV valve has a small spring inside, and when the pressure difference between the crankcase and the intake manifold is high enough, usually only under idle when manifold vacuum is highest, the valve opens and allows the gasses into the intake manifold. If the PCV valve is stuck open, it's possible the idle could be erratic, and another results may be increased oil consumption. If it's stuck closed, then the excess gasses will go out the valve cover vent and into the intake. The will often rattle when shaken, but not always. One way to check it would be to blow into the valve from both ends. You should only be able to blow air into the end that goes into the valve cover. Air flow should be blocked in the other direction. But given the cheap price of them, and ease of replacement, it's probably a good idea to replace it regardless.
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