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PCV - OIL TRAP 200

posted by  Amarin on  Mon Sep 20 11:42 CST 2021
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

"when I remove oil filler cap air pressure rushes out and revs drop"

I think your small vacuum hose is blocked. This is the short rubber hose from flame trap (that Y shaped plastic thingy) to intake manifold.

During idle, if this hose is blocked no engine vacuum could suck the blow-by gasses until throttle plate is opened ie. gas pedal pressed. At idle no engine vacuum should pass thru throttle plate. All the built-up pressure is being forced thru the idle valve raising the idle a bit. When you opened the oil filler cap the pressure is released so your revs should drop.

Clean your short vacuum hose. The nipples could be blocked too. Use small wire to unblock the nipples where hose is attached.

Amarin.





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