valve cover hose removal?
Thread Starter
Burning Brakes
Joined: May 2009
Posts: 1,014
Likes: 7
From: Ft Wayne IN
valve cover hose removal?
What are the pro/cons of removing the passenger side valve cover vent hose that goes to the TB and capping it off at TB with a filtered style breather in the valve cover? I assume it is pulling crancase gases into the TB? Is the negative pressure needed or can it just vent?
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Flow is actually opposite of your perception, the hose supplies filtered air from the throttle body to the crankcase as the inlet side of the PCV system in normal operation. If blowby exceeds what the PCV valve can handle, the flow reverses allowing crankcase gases to enter the throttle body through the hose.
Since your 92 is a speed density system changing the supply hose has the potential to cause fuel metering issues or high idle.
Since your 92 is a speed density system changing the supply hose has the potential to cause fuel metering issues or high idle.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Problem arises on MAF cars because PCV air to rocker cover from TB port is metered through the MAF 1st.
If you run a breather direct on the cover then that is un metered air into the engine that the ECM does not know about
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Team Owner
Joined: Jul 2004
Posts: 28,475
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From: Hartford WI
