[T3] On a 73 T-3 SB fuel injected auto trans pinging

Jim Adney jadney at vwtype3.org
Sat Dec 9 18:12:56 PST 2017


On 9 Dec 2017 at 20:58, Bobsnotch at aol.com wrote:

> This is the 1 thing that Ray really doesn't like about the 2 cap PCV
> system VW used. It has a bad tendency to open when it wants, and
> causes a miss. What  most of the type 4 guys do, is to strip out the
> guts of the valve, and add a  slug with a drilled hole in it (can't
> remember what size right off hand) in the  vac hose to the plenum. What
> this does is allow you to tune around the "constant  vacuum leak" of
> the small hole. I only mention this, as all of the type 4  engines
> (bus, T-4, 914) use that same valve set up, and have issues with it. I 
> haven't really studied how the VW designed PCV system really works, but
> then  I've only got 1 t-4 engine here, and it's on carbs. The rest of
> the type 3  engines are all 1 cap breather models, so no real PCV set
> up. 

All '72-3 FI Type 3s came with the 2 cap breather system. I've had several of 
them and they were all fine. No problems whatsoever. There's already a tiny 
little pinhole where that air enters the IAD, so there's no way for this to be 
overwhelming.

-- 
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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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