Mechanics

ECCELERATION

1997 GMC Jimmy

Engine Performance problem
1997 GMC Jimmy 6 cyl Four Wheel Drive Automatic

97 Gmc jimmy out of no where the acceleration goes from normal to 30 mph its so slow especally going up and hill I replaced the sparks, and the problem persist what eles could it be
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Jimy97
September 6, 2009.




Oxygen sensor
Catalytic converter
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

Rasmataz
Sep 6, 2009.


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