1998 Kia Sportage LACK OF ACCELERATION

1998 KIA SPORTAGE
15,300 MILES • 4 CYL • 4WD • AUTOMATIC
Avatar
TOBYLCANTRELL
This vehicle starts fine but once you push the gas pedal to accelerate it dies or sputters. If you lightly push pedal sometimes it will run fine. I have replaced the spark plugs and wires, both coils, mass air flow sensor, and throttle positioning sensor. No change. Can you please advise what problem may be.

Thanks so much!!
Dec 30, 2009 at 7:44 PM
Advertisement
Avatar
RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Possible causes could be one of the following:

Oxygen Sensor
Catalytic Converter
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
Dec 30, 2009 at 9:02 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.