2004 Hyundai Sonata lack of power

2004 HYUNDAI SONATA
120,000 MILES • 4 CYL • 2WD • MANUAL
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My Sonata is revving high in between gear changes and power output is lacking. Then revs go down and regains power!!! What can it be??? Can it be a fuel problem???
Jul 2, 2010 at 10:13 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
If your transmission is not slipping-do below:

Possibilities: Inspect and test all the following listed below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard
Jul 3, 2010 at 1:36 AM
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