Thanks to all who replied with timely information to my erratic idle
post. The distributer and the carburetors were rebuilt within a year of the
engine rebuild. I checked the overrun valves and they are in good shape. I
tightened in the trim screws. It does seem that these things, and blocking off
the carbon canister has made a positive improvement. I now think that the most
likely remaining suspect is a vacuum leak, and that it may be a number of very
small leaks that are not, individually obvious.
I am going to keep banging away at the problem and I?ll post my result
when I finally have the problem resolved. Thanks again.
Best,
Bob
> On May 18, 2018, at 10:54 AM, Rochlin Robert <rrochlin at comcast.net> wrote:
>
> I?ve been working through, what I think is, a carburetor problem. My
> 72? TR6 has a rebuilt engine with a Goodparts mild cam and compression of
> about 9:1. Then I start from cold the engine runs really well, but after it
> is throughly warmed up it gets finicky. When I idle for a long period of
> time the idle will gradually decay. Also if I stop, the engine will start
> right up, but idle at a very low RPM. This poor idle improves as the engine
> is rum for a while. On one hand is sounds like vapor lock or at least heat
> effecting the carburetors, but the weather here is not hot yet and the engine
> seems to exhibit this behavior when the ambient temperature is in the 60?s F.
> My knee jerk reaction is that I should add a carburetor heat shield, but
> before I did that I wanted two ask if anyone else has had this difficulty or
> may suggest something I?m missing.
> Thanks in advance.
> Bob
|