Thanks everyone for the great suggestions. I have a couple of updates:
1. No apparent vacuum leaks at either the carb -> Intake or Intake -> Head.
2. I don't seem to have the metal tag on the carbs to tell me which model
they are but I've discovered something interesting upon partial disassembly
to check the diaphragms (which appear fine). I notice that the carbs on the
car have fixed needles. However, in the box of parts that came with the car
many years ago, I have an extra set of carb tops, air valves and needles
that are adjustable. I'm assuming they were changed at some point. Both my
carbs and these extra tops say 175 CD-2. Are the fixed/adjustable
interchangeable? If not, there is a chance I have miss matched pieces in the
carbs. According to the Buckeye site, a '72 should have adjustable needles
which leads me to believe those extra parts in the box are originals.
3. The bypass valves on the carbs have vacuum ports suggesting the carbs are
from an earlier car. I believe the '69s and the 250s had this. They are
blanked off on my car.
4. The symptoms seem to suggest the carbs are running lean. (Requires choke
to run better, pops on deceleration, rpms slow when I lift the carb air
valves) 5. A couple of you suggested that possibly the spark is out of
phase. I haven't had any major engine work done on the car but I'm not sure
what happened to it before me. I have had the car running close to good at
times which suggests to me that it not something as major as that, but I'm
no expert here.
Any thoughts where to go from here? The Buckeye sure has a lot of great
information which I will put to use. I want to make sure I have the right
pieces at least before I attempt to rebuild the carbs.
Thanks.
Steve
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Steve Wylie
Sent: Friday, February 13, 2004 8:49 PM
To: 6pack@autox.team.net
Subject: I'm puzzled
Hi Listers.
I've had my 72 TR6 for several years now and it's never really run well
consistently. It's a Sunday drive so it's never been a big priority to fix
it. I've tried several things and had it running quite decent on a few
occasions, but I'm determined to get the car running well, all the time.
Right now the car runs best with the choke pulled half way but still misses
at all engine speeds. With no choke it usually misses pretty badly. Here's
what I know:
*With timing set to 4ATDC, the car barely runs. The best running is about
20 BTDC or thereabouts.
*Just replaced points with a Crane 700 ignition and high performance coil
(didn't improve problem)
*Retard works fine when I apply vacuum
*Centrifugal advance seems to be functioning upon visual inspection
*My vacuum line connects to a valve on my upper radiator hose, then to rear
carb. Not sure if it's functioning properly.
*Checked the valves and made very minor adjustments
*Plugs seem to be firing well based on visual inspection
*Carbs have been tinkered with many times with slight improvements noticed
at times. I haven't rebuild them and I'm tempted to have a pro rebuild them
just to make sure they're functioning properly
Any suggestions would be appreciated.
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