2003 Pontiac Grand Am car loses power

Tiny
DEB4295
  • MEMBER
  • 2003 PONTIAC GRAND AM
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 14,000 MILES
Car loses power when driving uphill. It will do fine on flat ground. What could be causing the car to lose power going uphill?
Tuesday, January 12th, 2010 AT 12:37 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the following below:

Oygen 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
Cap and Rotor

Note:If it doesn't apply, disregard.
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Tuesday, January 12th, 2010 AT 4:03 AM

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