In a message dated 9/25/00 8:14:27 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
<< My GTS seems to run a bit rich when it's cold.
>>
Doubtful, a cold engine tends to run leaner than a hot engine. This is true
to the point that is is used as a diagnostic test for rich lean conditions.
If the engine idles better when it is warmed up than when it is cold, it is
lean when it is cold. If it idles better cold than when it is warmed up, it
is too rich. Of course, this refers to idle circuit, since no one would rev
an engine that is not up to operating temperature yet. The GTS uses a "wax
pellet" to richen the mixture at an idle and allow the mixture to lean as the
warmth of the engine takes over. An engine that is rich when it is cold is
richer when it is hot. Therefore, the running symptoms would be normal
running cold with performance deteriorating as the engine warms. It is
possible that an engine could have a problem so severe that it is either so
lean or so rich that it runs bad whether warm or hot, but generally, there is
still a noticable difference in running between cold and hot. The good news
about a problem that severe is that it makes it that much easier to find.
Rich is accompanied by black smoke and black plugs. Rich also sounds like a
stumble or blubber. Lean is a hesitation or resistance to take throttle.
Spark plugs come out white, possibly glazed white. At an idle, a lean
condition is indicated by a hunting or fluctuating idle. A rich condition
produces an idle that gradually dies away.
