[DeTomaso] Oil from PCV

[Tomas Gunnarsson]

AFAIK there are always two hoses in the system. Fredrik says that he's using one PCV valve, not two, and that it's on the high vacuum side. He doesn't specify where his other hose connects but it's common practice to attach it to the air cleaner on the clean side. This qualifies as "before the throttle blade". I doubt that he's attached it to the actual throttle body.

Tomas

----- Original Message ----- 
From: <JDeRyke at aol.com>
To: <pantera at kommevalla.se>; <detomaso at realbig.com>
Sent: den 28 juni 2007 20:15
Subject: Re: [DeTomaso] Oil from PCV


> In a message dated 6/27/07 2:44:05 PM, pantera at kommevalla.se writes:
> 
> << When starting up the engine after the EFI installation some oil is coming 
> thru the PCV valve into the plenum. I have attached the hose from the PCV to a 
> connection after the throttle blade and the hose from the other valve cover 
> to a connection before the throttle blade. The PCV is working as it should. Is 
> there any way to prevent this from happen?  >>
> 
> Why have two hoses? The connection AFTER the throttle blade will show high 
> vacuum at idle and reduced vacuum as the throttles are opened. The second 
> connection will act in reverse- higher vacuum at high rpms and no vacuum at idle. Do 
> both hoses suck oil? Do both hoses connect to a PCV? The PCV should be hooked 
> to the 'after' hose. 
> If a PCV is connected properly and is not in the rocker cover upside-down 
> (which is quite possible), excess oil may be coming from one of two sources. 
> First, if one of the two small oil drainback ports in the ends of the heads 
> is blocked, oil will accumulate to the point of overflow and will go up the 
> PCV. This is especially true with a high-volume or high-pressure oil pump, which 
> is totally un-necessary for street cars. 
> Fix: clean out both drains thoroughly. This can be done with heads mounted in 
> the car, by winding in a 5/16" dia screen door spring that will follow the 
> s-shape contours of the non-straight drain. The straight drain can be cleared 
> with a drill bit if necessary. Note also that any slop cleared by this method 
> will fall into the pan to possibly cause further trouble, so change the oil 
> afterwards.
> If both oil drains in the heads are clear, the oil is likely coming from 
> blow-by past the rings and an engine overhaul is your only other recourse. Good 
> luck- J DeRyke<BR><BR><BR>**************************************<BR> See what's 
> free at http://www.aol.com.</HTML>
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