I'd love to hear the answer to this as I have very
similar symptoms and replaced lots of things trying to
figure it out. It doesn't do it all the time, but
it's annoying when it does happen!
Perhaps a worn spring on the distributor...something I
haven't tried yet?
Cheers,
Todd
--- "Navarrette, Vance" <vance.navarrette@intel.com>
wrote:
> Listers:
>
> Just thought I would share my recent frustrations
> fixing a low
> speed miss.
>
> Since I brought the 6 out of storage, it has been
> very colicky.
> At first I thought perhaps bad gas, then I thought
> it was just bitter
> about not being driven all winter. Hey, don't laugh,
> I am sure you would
> all swear your TR6 has its moods.
> The symptom was a low speed miss when pulling away
> from a stop.
> Sometimes it would miss once, sometimes it would
> miss twice, sometimes
> no miss. This is not a bog, but a soft pop and the
> car will jerk
> sharply. Adjusting the choke made no difference, and
> the problem would
> occur when both warm or cold, although the problem
> got somewhat worse as
> the car warmed up. The engine would rev just fine
> with no breakup or
> missing at the upper RPMS. Battery voltage was about
> 14 volts,
> temperature in the middle of the gauge, healthy oil
> pressure. Stock
> ignition (Lucas coil and points, no Pertronix). No
> blue smoke, no white
> smoke at idle or any other time.
> My TR6 has a 270 degree cam, 9.6:1 CR, stock
> exhaust, dual
> zeniths with B1AR needles. Carbs have been rebuilt,
> compression in all 6
> cylinders is 145PSI +/- 5 PSI. K&N air cleaners in a
> stock filter
> housing. Manifold heat is connected. 1974-1/2 car
> with EGR and all
> emissions systems connected. Stock rockers, valve
> lash set at 0.015",
> idle at 900 RPM - with what sounds like a very
> *slight* miss at idle. <-
> another clue!!
> OK, those are the symptoms. Here are some
> additional clues so
> that you hairy chested LBC drivers can test your
> diagnostic acumen. I
> say this because I always love a challenge, and I
> might as well torment
> you all in the name of camaraderie. =:-o
>
> Here are some additional clues:
>
> 1. Fresh plugs made no difference (Champion 12NY).
> 2. Adjusting the mixture rich or lean made no
> difference.
> 3. Fresh gas made no difference.
> 4. New plug wires made no difference.
> 5. Checked the timing, spot on at 4 ATDC dynamic.
> No observable
> spark scatter when revved.
> 6. Wider or narrower plug gaps made no difference
> (+/- 0.005").
> 7. Vacuum retard functioning correctly.
> 8. Topped off the dashpots with penrite oil, still
> no
> difference.
>
> OK, listers. Do you think you know what I missed?
> Can you offer
> a shrewd insight (or a least a derogatory comment)
> as to my utter
> failure as an LBC mechanic? I know the answer, as
> the miss was resolved
> just this weekend.
>
> I am offering a prize for the correct diagnosis.
> The winner will
> receive one "attaboy", redeemable with $2.00 for a
> cup of Starbucks
> coffee and the glory of having his or her kung fu
> publicly acknowledged
> as the best.
>
> Post your guess to the list, Kastner wannabes!
>
> Vance
>
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