2001 Hyundai Sonata Hesitation

AMJACK

MEMBER
2001 HYUNDAI SONATA
6 CYL
FWD
AUTOMATIC
106,000 MILES

My. Car is hesitating when I take off from a complete stop. It asks like it isin't getting any power then it suddenly takes off. Also, as I am driving, it hesitates or acts like it is going to lose power and at a complete stop it constantly jerks (rpms go down almost to zero then jumps back up). What could be the problem?

Thursday, November 12th, 2009 AT 1:53 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

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, November 12th, 2009 AT 3:33 PM