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2002 kis Sportage misfiring, P0300-P0304-P0303, if this just started over night? What could be the cause?

Tiny
KCGILCHRIST
  • MEMBER
  • 2002 KIA SPORTAGE
  • 123,000 MILES
Lack of exceleration, pops or back fires under engine while driving, has no HP going up hills from dead stop? Ran diagnostics, came up with the codes listed above? Whats going on?
Friday, October 21st, 2011 AT 3:08 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs

2.Inadequate spark/coil,defective spark plug wire.

3.Lack of compression

4.False air leakage.

5.Faulty fuel injectors.

6.Insufficient fuel pressure.

7.Contaminated fuel.

8.EGR valve that is leaking.

9.Oxygen sensors.

10.Throttle position sensor.

11.Manifold absolute pressure sensor

12.Mass Airflow Sensor

13.Idle air control valve

Note: If it doesn't apply disregard it-
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Wednesday, October 26th, 2011 AT 11:45 AM

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