I had the same with my TR3, it was as simple as the throttle stops
were not properly sync'd. One was down just a little too far and was
holdind the other carb open.
Solution is the disengage the carbs so they are independent and re-
sync them and re-reconnect.
Or, it could be excessive wear in the carb bodies... a more involved
issue that usually means sending them off for a rebuild.
Mobile Bill
On Jun 5, 2010, at 7:30 AM, Cosmo Kramer <tr4a2712@yahoo.com> wrote:
> Hi List!
>
> I've got a problem/question for the list to help me out on:
>
> History: I start up the car & everything is great on the instrument
> readings-
> Idle= 850-900 RPM. After the engine runs for about 1/2 hr. doing 40+
> MPH- tach
> is reading 2,000->3,000 (depending on my driving speeds). When I
> then come to
> a stop light, sign, etc. the RPM's stick at 2,000. I then 'blimp'
> the gas
> peddle (a quick accretion & then drop the pressure on the gas
> peddle) the
> RPM's then drop down to idle speed =850->900.
>
> Question: What's causing this to happen?
>
> I think it's the carb. linkage sticking. So I've cleaned the linkage
> with a
> tooth brush, then blew compressed air on to the linkage on the
> inside of the
> engine bay. Then proceeded to place a drop of graphite oil (thinking
> at this
> is a "dry lubricant") onto all pivot points of the carb & gas peddle
> linkage,
> hoping to prevent sticking. I then let the engine cool (next day),
> to TR (test
> ride) the TR4A again to have the SAME thing happen all over again.
>
> -Cosmo Kramer
>
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