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++> still sometimes idles really high when it gets hot (during the run this
++> happened, engine temp between 3/4 mark and red).
/This sounds like your throttle plate bypass values are sticking
/open. These things give me a lot of trouble too. If the problem persists
/after you get the timing set properly, I'd try increasing the spring
/pressure on the valves a little bit at a time until the problem goes
/away. (you increase the spring pressure by turning the screw adjusters
/counterclockwise) The PCV and vapor recovery system can cause a
/mega idle too, but I'm assuming you left that alone.
I'll try this, I've never adjusted these at all. I left them as is when
I got the rebuilt carbs back by Apple. What do these do anyway?
/I think you have a vacuum retard that is activated when the
/throttle plate is closed (there is a port in the carb throat). I would
/disconnect the retard unit, plug the line, and time the engine using the
/earlier GT6 spec (something like 5 or 10 degrees BTDC).
/Verify that the timing increases dramatically when you first open the
/throttle. BTW, this assumes that you have an idle retard system, but
/I'm not positive that is the case on a later California GT6 mk III
/like yours.
Yes, sounds like it. the line hooks up to a port underneath the rear
carb then goes to the dist. (the temp switch on the radiator is not
there since I have a GT6+ radiator installed.) I've also noticed there
is no vacuum at the port when the carbs are choked. When you say
"timing increases dramatically", I assume that you mean it advances,
since the vacuum on the retard goes away.
Mike
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From: William Hartwell Woodruff <woodruff@engin.umich.edu>
Date: Mon, 23 Oct 1995 14:49:03 -0400
Subject: Re: GT6 tuning help needed
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