Chevrolet Light Operator's Manual page 95

With the aid of another person it
is
possible to check the
igni
M
tion circuit further by placing the blade of a wood handled
screwdriver across the terminal of a spark plug and holding it
about
%
inch from side of engine. Have the other party operate
starter and see
if
a good spark jumps the gap from screwdriver
to engine.
]f
there is a good spark on this test, evidently the
trouble is in the fuel system.
Ip.
cold weather there may
be ice
in the lines restricting fuel flow. It will probably be necessary
to solicit the services of a service man to make necessary
repairs.
Engine Misfires. This
condition may
be
caused by many things,
some of which can only be corrected by major service oper-
ations. However, the following things should
be
checked.
1. Check to see that
all
spark plug wires are cOlUlected to
the spark plugs and properly pushed down into distributor
cap. Also make sure they are not shorted or broken.
2. Check the spark plugs by shorting them to determine
which cylinder may be missing. Remove the questionable plugs
and clean, inspect and set the point gap at .035". U the plugs
are thought to
be
faulty they should be replaced with plugs of
the same make and number.
3. A flooded carburetor may also cause a rough running
en M
gine. When the carburetor is flooded there is usually fuel on
the outside of carburetor body. Sometimes tapping on the body
with a pair of pliers may relieve this flooding condition; otherM
wise, try to keep the engine running at a fast idle until you
can get to a servioe station.
4. This condition may also
be
caused by an
air
leak into the
intake manifold. Tighten carburetor to manifold and manifold
to cylinder head nuts. Check for air leaks
in
the windshield
wiper and hydrovac lines.
5. Improper valve tappet clearance.
Check clearances aC M
cording to instructions on page 23.
Carburetor Floods. This is usually caused by a sticking car-
buretor float, dirt between the needle valve and seat , or a
leaky valve and seat. The carburetor should be overhauled as
soon as possible to avoid further trouble.
'93'