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2006 Isuzu Ascender slow acceleration

Tiny
MFASCI81
  • MEMBER
  • 2006 ISUZU ASCENDER
Engine Performance problem
2006 Isuzu Ascender 6 cyl Two Wheel Drive Automatic

When I press the gas it hesitates to go. We haven't change the transmission oil or filter. What is another reason for slow acceleration?
Wednesday, October 14th, 2009 AT 7:23 PM

1 Reply

Tiny
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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Wednesday, October 14th, 2009 AT 8:52 PM

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