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2003 Chevy Cavalier

Tiny
CLINTON COFFIN
  • MEMBER
  • 2003 CHEVROLET CAVALIER
  • 4 CYL
  • 2WD
  • MANUAL
  • 80,000 MILES
It was running fine. Got gas and then car started hard. Engine was running rough and gas mileage went from 33mpg to 10mpg and could not get speed above 60MPH. Engine acts like it is flooding out and runs real rough.
Saturday, January 2nd, 2010 AT 7:24 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the following below:
Oxygen Sensor
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Coil and rotor
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Sunday, January 3rd, 2010 AT 12:12 AM

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