36
Condition Possible cause Correction
Engine hesitates
(Momentary lack of
response as the
accelerator is
depressed. Can
occur at all vehicle
speeds.
Usually most severe
when first trying to
make the vehicle
move, as from a stop
sign.)
Abnormal condition in electrical system
1. Defective spark plug
2. Deteriorated ignition coil, or crack resulting in spark
leakage
Abnormal condition in fuel system
1. Inadequately discharging fuel pump
Abnormal condition in engine
1. Loss of compression pressure due to leaky cylinder
head gasket
2. Compression pressure too low because of worn pis-
tons, rings, cylinders or burnt valves
Replace
Replace
Replace
Replace
Replace and rebore as
necessary
Surges (Engine
power variation
under steady throttle
or cruise. Feels like
the vehicle speeds
up and down with no
change in the accel-
erator pedal.)
Fuel system out of order
1. Clogged fuel filter
2. Kinky, leaky or damaged fuel hoses and lines
3. Malfunctioning fuel pump
4. Leaky manifold
Ignition system out of order
1. Defective ignition coil
2. Defective spark plug (excess carbon deposits,
improper gap, burned electrodes, etc...)
Replace
Check and replace as
necessary
Check and replace as
necessary
Replace
Check and repair or
replace
Check and clean, adjust
or replace
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