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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