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Re: Rough idle problem

Subject: Re: Rough idle problem
From: Geoff Burns <gburns@directcon.net>
Date: Sat, 05 Oct 2002 22:07:40 -0700
Cc: triumphs@autox.team.net
References: <107.190e6727.2ad0b71e@aol.com>
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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