1995 Mitsubishi 3000GT Noticing a loss of power

Tiny
DEVVON123
  • MEMBER
  • 1995 MITSUBISHI 3000GT
  • 6 CYL
  • 2WD
  • MANUAL
  • 163,000 MILES
Hi I own a Mitsubishi 3000gt(non Turbo)(Manual). Lately iv been driving up hills and when I push the gas pedal clear to the floor it seems to just wants to die on me, as soon as I let up on the gas from all the way to the floor, it picks back up speed, even when im on the highway if I accelerate to the floor it really does not want to pick up speed, when I first bought the car it had 158,000 miles and it had no problem picking up speed or have no problem going up a hill until I owned it for about 3 months, some of my buddys says it could be a Catalytic Converter, fuel pump, spark plugs, fuel injectors, I already replaced my fuel pump and my spark plugs and they did not help the problem, but I also noticed when I get gas cause its premium only it seems to bog down when I take off after putting the fuel in, id figure it was just water in my tank so I bought fuel injector cleaner and I did not help, it still does not pick up speed as it used to.
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Friday, January 15th, 2010 AT 9:46 PM

1 Reply

Tiny
RASMATAZ
  • EXPERT
Check and test the following

Oxygen sensor
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
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Saturday, January 16th, 2010 AT 4:56 AM

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