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THE 7 MOST COMMON ENGINE PROBLEMS AND HOW TO AVOID THEM PAGE 2
Fuel degrades when exposed to oxygen (which makes it unstable). Gasoline suffers
from the evaporation of light ignition vapors necessary for healthy combustion. If
your fuel is old or came from an unreliable source, it might be causing your engine
to run poorly.
Common causes: engines that sit too long (varnish), water contamination,
contaminated gas station fuel, vented fuel tanks or storage containers that sit too
long
7. BAD FUEL:
Are you noticing a drop in fuel economy? Poor fuel mileage means your car or truck
is not running as efficiently as it could.
Common causes: dirty fuel injectors, low tire pressure, dirty air filter, bad spark plugs
or misfires, using the wrong motor oil, chamber deposits (predetonation, pings)
6. LOSS OF MPG:
Loss of power describes an engine that still runs but does not work as hard as it
should. Power loss is usually noticed when going up hills.
Common causes: clogged fuel filter, dirty fuel injectors, dirty carburetor, dirty air filter,
weak fuel pump, failing ignition parts (coil, spark plugs, plug wires)
5. LOSS OF POWER:
An engine with a hesitation problem will lag, stutter, or stumble when you press
down on the gas pedal or throttle. Hesitation can be any delayed power response
when you need to accelerate.
Common causes: clogged fuel filter, dirty fuel injectors, failing ignition parts (spark
plugs or plug wires), vacuum/air leak, weak fuel pump, bad fuel
4. HESITATION:
A stall is when an engine dies out when it’s supposed to be running. Even though the
engine may start back up again, stalling usually means that the engine is not getting
enough fuel or air flow. A healthy engine never stalls.
Common causes: clogged fuel filter, dirty fuel injectors, dirty carburetor, dirty air filter,
bad spark plugs or coil
3. ENGINE STALLS:
Idle is the rate an engine runs while in park or without pressing the gas pedal or
throttle. Most car and truck engines idle steady at 600 to 1200 RPM. You’ll know you
have a rough idle when your engine feels shaky, sounds unsteady, or gives a sense of
being out of rhythm. A healthy engine idles smooth and quiet.
Common causes: dirty fuel injectors, dirty carburetor, bad spark plug or plug wire,
vacuum/air leak
2. ROUGH IDLE: