Geof: Color tune is a spark plug with a glass window so you can see the
gasoline burn. You want a pretty blue burn, other colors mean mixture
errors.
Mickey: Is the timing advancing when you accelerate? Are the vacuum modules
holding a vacuum? (Suck on the hoses) Does the dizzy need some lube on the
weights? How about the bypass valves on the carbs, did you put new
diaphragms in there when you worked on the carbs? Temp compensator stuck
open or closed? When was the last time you replaced the dizzy cap and
rotor?
Just some food for thought.
Jim Altman jaltman@altlaw.com Illigitimi non Carborundum
http://www.altlaw.com/metro/jaltman.html 69-TR6 76-TR7 80-TR8 W4UCK
-----Original Message-----
From: owner-triumphs@autox.team.net
[mailto:owner-triumphs@autox.team.net]On Behalf Of Geoff Burns
Sent: Sunday, October 06, 2002 1:08 AM
To: jaltman (rfc822 Compliance issue To: added by system POTENTIAL SPAM)
Cc: triumphs@autox.team.net
Subject: Re: Rough idle problem
I hate to sound ignorant, but it can't always be avoided.
What the heck in Color Tune??
Geof in CA 69tr6
Mickylong@aol.com wrote:
> OK, I know when I'm over my head...
> I seem to be unable to cure the rough idle on my 72 TR6 no matter what I
try
> to adjust. I've got my carbs back to where they can be adjusted but seem
> unable to cure the idle problem by mixture adjustment. Given the axiom
that
> most carb problems are really ignition, maybe someone can suggest
something
> to try here that I haven't thought of. Here's what I'm experiencing:
rough
> idle at about 1200 rpm (with intermittent popping from exhaust.) Engine
dies
> when idle is set lower. Engine dies when either carb damper is lifted at
> all. Color Tune shows cylinder 1 burning blue with slight orange;
cylinder 6
> burning mostly orange-this is the one that does not change color during
> mixture adjustment. Plugs show black carbon deposits after minimal
runtime
> which I've always thought indicated mixture too rich. Timing light
indicates
> about 12 BTDC, but I didn't notice significant difference when resetting.
> There doesn't seem to be much (if any) difference with vacuum line
> disconnected and plugged.
>
> I thought maybe I have a bad vacuum unit or thermostatic switch but I'm
not
> sure how to test. Plugs and points are new and gapped appropriately and
I've
> also replaced the fuel pump and filter (had the parts and thought might as
> well) with no change. I keep thinking I must be missing something basic,
or
> at least I hope it's not something more involved. Any thoughts would be
> appreciated.
>
> Micky Long, Atlanta
> 72 TR 6
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