John,
It sounds like the outer part of your crank pulley may have rotated on
the rubber. Try checking the piston TIC location using a wire in the
spark plug hole to verify the pointer location. Examine the pulley.
Sometimes when they slip, the rubber sticks out a little farther than
normal.
Jim
----- Original Message -----
From: "John Korsak" <jkorsak@heath-bloxom.com>
To: <6Pack@autox.team.net>
Sent: Thursday, October 25, 2001 10:40 AM
Subject: Stumble, miss & hesitate
> Dear 6 Packers,
>
> I have a problem that my mechanic and I can't solve. I have a 74 TR6
with
> overdrive that runs good. The problem is that my timing needs to be
set at
> 32 deg BTDC at idle to run smooth (yes, I said 32). Setting it at 12
deg
> BTDC at idle makes it stumble, miss and hesitate between 1500 RPM and
3000
> RPM. After 3000 RPM it runs fine. Vacuum retard does not seem to be
> working as it has no effect on timing while on or off (I don't think
that
> thermostatic vacuum control switch is working. It has vacuum from
carb, but
> not at distributor).
>
> I have replaced points with Pertronix system, replaced spark plug
wires,
> fuel filter, carb diaphrams, dash pot oil (10W50,stays full), and
> distributor springs. I have adjusted carbs full rich, but engine does
not
> increase RPM when I lift Air Piston 1/16". I just finished checking
> compression, and her are my readings: (stock head &
> cam)130,125,140,125,125,140. We also checked to see that #1 piston
was top
> dead center with crank shaft indicator. Tach cable points slightly
away
> from being parallel with engine block (just outside of fuel pump).
>
> I also just checked my gas mileage. A 200 mile trip this last weekend
> resulted in only 22 MPG while I got 28 MPG when I went to the Trials
(with
> timing set at 12 deg BTDC). The TR has always started great hot or
cold(with
> choke).
>
> Any suggestions?
>
> John in Kansas CF25165UO
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