The PCV valve is a NOS unit I purchased at the beginning of the rebuild since I did not trust the old one. I can easily disable this one by plugging the hose connection but I don't think I'll see a big difference with the vacuum. This S2 cam is supposed to idle near 13" of vacuum and as of last night the engine was idling with 11". That's close enough to be accounted for by measurement error and not being completely dialed in yet.
Thanks again,
Doug L.
--Previous Message--
: Hi Doug,
:
: With regards to your vacuum hiccups:
: Check to make sure your PCV valve (that
: weird thing with the hose to the valve
: cover) is functioning correctly. If it
: doesn't close properly, it will vent
: the intake manifold to the crankcase
: when it's not supposed to (i.e., idle).
: To see if this is the problem, just
: cover the tube on the valve cover and
: plug the hose going to the manifold.
:
: none the less - Congradulations!!!
:
: Jim M
:
: --Previous Message--
: Thanks Glen,
:
: If I run the engine up to temperature
: one more time would you advise
: re-torquing with the engine hot or
: cold? Obviously if hot I will need to
: leave the cooling system
: "open" so there is no
: pressure on the water jacket. Your
: advice is most appreciated.
:
: The curious thing about the vacuum is
: that the OLD worn out cam did this with
: the the engine before rebuild. That
: old cam was supposed to be a
: performance item but my father-in-law
: did not know anything about the grind.
: I always blamed the previous low vacuum
: on that cam. Since the low vacuum is
: still present, I now suspect the carbs
: and/or manifold. I made sure the
: manifold surfaces were flat and I am
: using a new manifold gasket. Previous
: attempts (prior to rebuild) to find
: vacuum leaks revealed nothing. What
: else can cause such low vacuum
: readings?
:
: Doug L.
:
: --Previous Message--
: With that low vacuum, there is no way
: to
: tune it properly. Hope it's something
: simple like just a leak...
: Re re-torquing, that was normally done
: on the PDI (pre delivery inspection)
: when the car was sold new from the
: dealership. That step was often
: overlooked, for obvious reasons, and is
: partly to blame for some of the
: legendary head gasket
: "problems" that some of these
: cars had.
: With a composition gasket, I do it
: after the initial shop run period,
: 15-20 minutes, then again after
: ring-seating driving and a half-dozen
: heat cycles or so.
: Yeah on some engines it is a real PITA,
: but this is a VERY important step...
: Glen
:
:
:
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