It sounds as if there is air getting into the system somewhere. It's
most likely around the throttle shafts.
Before spending $350 for someone to rebuild the carbs, I'd recommend
taking the bodies to someone who can drill out and re-bush the shaft
channels and replace the throttle shafts with standard size ones.
I had that done to my SU's for about $60.00 not including new shafts.
M. Secrest wrote:
> Since I've owned my GT6, about 2 years now, I never have been able to
> get the carbs to behave quite rightly. The chief problem is that
> they won't idle correctly -- even with the
> throttle stops fully out (i.e. the butterflies fully closed), the
> car still wants to idle high. And now that I've put in electronic ignition,
> a header and free flow exhaust, the lowest idle I can achieve is about
> 1100 rpm, again, with the stops all the way out. As you can imagine,
> with this setup, the air flow is not balanced, and yes, the butterfly
> valves are installed correctly.
> Having said all of that, I'm wondering if it's just time to send the carbs
> off to Apple for rebuild. I believe they have about 70K on them; would
> it be reasonable to expect that the jets have grooves worn in them,
> causing this high idle? Also, can you SEE such grooves? (The throttle
> shafts seem O.K., but I suppose these could be letting in air as well.)
> In any case, before I spend $350 with Apple, I thought
> I'd conjure up the list spirits for advice here. I'm also sort of
> wondering if this isn't just the time to think about carbs other
> than the stock 150's, but I do drive the car on the street, and I'm not
> eager to encounter smog law hassles.
> Martin Secrest
> 73 GT6
> 72 TR6
"If you can't excel with talent, triumph with effort."
-- Dave Weinbaum in National Enquirer