I'm not entirely sure about this, but if you don't have the vacuum advanced
hooked up, you won't have enough advance at higher revs? I can only guess
that the diaphram is vibrating rapidly because it is expecting vacuum and is
not getting it??? Are you talking about the diaphram in the vacumm advance
unit? You have to have *some* spark advance at higher rpm or the timing
will be off even at cruising speeds.
On 8/4/08, Marc <email@example.com> wrote:
> I can't hook it up, as the diaphram is vibrating rapidly - don't want to
> destroy a newly rebuilt vac unit.... Oh, and to answer the earlier question,
> the vac line is hooked to the manifold. Am I to understand this is
> Jim Johnson wrote:
> Do you mean you have been driving the car without the vacuum line hooked
> up? Reconnect it and tell us what it does.
> Knocking/pinging related to timing problems/too low octane/improper valve
> lash...etc usually is most noticeable under load. Engine overheating can
> cause it as can an improperly torqued knock sensor on engines so equipped.
> Again, however, it should be most noticeable under load (acceleration or
> driving uphill). A knock or ping while not under load may be something more
> On 8/4/08, Marc <firstname.lastname@example.org> wrote:
>> What I wasn't clear about is the advance has NOT been hooked up at all.
>> Billy Zoom wrote:
>> >> It generally occurs (or is only noticeable)
>> >> under extremely light throttle -
>> > Do you have it hooked up to manifold vacuum instead of venturi vacuum?
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