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2003 Hyundai Sonata engine hesitates

Tiny
SOUTHSTAR
  • MEMBER
  • 2003 HYUNDAI SONATA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 32,000 MILES
I recently had my oiled changed 2 weeks ago. Since then my car feels like it is getting ready to stall while driving on the road. When I come to a stop and proceed to go forward it only goes about 5-10 mph then eventually goes into gear? Could they have put the incorrect oil in my car. They used a Prolene QT 10W30 oil
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Thursday, July 16th, 2009 AT 9:19 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
2003 Hyundai Sonata engine hesitates

Possible causes on hesitation:

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
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Thursday, July 16th, 2009 AT 9:35 PM

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