[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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