Clinton News-Record, 1980-10-23, Page 46•
Rn
All American cars
nowadays . have
automatic chokes, and
most of the later models
have a preheated air
system. It!s important
that both systems - choke
and pre -heated air
function well, I they
don't," the result can be
hard starting, stumbling
and hesitation while the
engine is warming up,
and decreased fuel
economy.
A stacking choke and a
loose or missing hose
from the pre -heated air
system are two fairly
common problems --on
cars that have ac-
cumulated some mileage„
Fortunately, you can
check both items quickly.
Here's how:
•AUTOMATIC CHOKE
The purpose of the
automatic choke is to
provide a richer fuel -air
mixture during startup
when the engine is cold. It
does this by blockingoff
most of the area of the
carburetor where the air`
enters. As a result, less
air than usual travels
with. the 'fuel into the
combustion chambers,
making the fuel -air
mixture richer, and more
combustible. As the
engine warms up, the
choke opens up, allowing
the normal amount of air
to enter along with the
fue -so -the- m ixture --of -
fuel and air is then
To check the choke, the
engine Should be cold. 0
it has net been run for 4,
few hours, say overnight
for example, it will be
eOld,
Remove the top from
the air cleaner. It's
usually held onf)y a wing
nut. Just unscrew the nut
and lift the top off.
'In the middle of the air
cleaner you'll see the
carburetor throat. At the
top of the throat will be a
plate that pivots on a rod.
That's the choke plate.
Have a friend press the
accelerator pedal down
Calibrated leaner.
dro carlxin emisSions
are reduced.
On a cold day when a.
cold engine is started, the
vacuum diaphragm (see
itiostratioa pills up the
air control valve in the.
air cleaner's snorkel.
That shuts off the cold
outside air. Air can now
'enter the snorkel through
the flexible pipe (orhose,
depending on your ter-.
rninology) that is con-
nected to a shield that's
around the hot exhaust
manifold. The air paSsing
over the hot exhaust
should snap shut. Now
have your friend start the
engine. As the engine
starts the plate should
open just slightly.
Now let the engine idle,
and watch the choke
plate. At this point the
choke plate, though open
slightly, will be almost
closed. But as the engine
warms up the choke plate
will gradually open until
it's in a vertical position.
If it 'does this, you can
assume the choke is okay.
If it doen't, it probably
needs adjusting. Have it
checked by a mechanic.
THE HEAT -PIPE
CONNECTOR
To meet emissions
standards, modern car-
buretors are carburetted
lean. Pre -heating the
enters the carburetor as
pre -heated air.
Sometimes, though, the
hose or pipe that connects
the shield (also
sometimes Called a heat
stove) around' the
exhaust manifold to the
air -cleaner snort•el is not
connected - or was ac-
cidentally knocked off,
purposely disconnected
in the mistaken belief it
would improve per-
formance, or missing
altogether.
If the fiose is discon-
nected or missing, cold
air enters the air cleaner
through the passage that
would ordinarily admit
warm air. Cold air is
more dense than hot air.
So an already lean
carburetor gets leaner,
and hesitation and
• ,intake-; eir to- -the -car—stumbling develop during
buretor during warmup, warmup.
leanerlets the carburetor be, 'W -hen the engine
. •
st
•
rti
warms :up,. though, it
behaves 'norm'ally
because the:sensor in the
:.,air cleaner that passes
vacuum to the Vt“tiuiri
.„.diaphragm • doesn't let
any More vacuum by; the
air -control valve then
. closes off the passage for
I •
Winter's com
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the prehated air, and
ever Ything performs
normally. The stumbling
Problem Qecurs only
when the engine is cold
and warming up. To
check, make sure there's
a big round hose
W./
on,
nected underneath the air
cleaner at the snorkel,
and that its, other end is
connected to the _shield
around the exhaust
manifold. If either end of
the hose* is off reconnect
it, If the hose is missing,
have one put on.
Tailgater
401e)y
"zit)
- 91ov
jVL
The way to recognize a tailgater is by looking in your rear
view mirror and finding it full of someone who'd rather
be in front of you.
Tailgaters are aggressive, inconsiderate and annoying.
They cause a lot of accidents. So the next time one
appears behind you let him through.
Chances are you'll see him later . . .
at the side of the road
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