Question about 1999 Mitsubishi Galant

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Lack of power

99 mitsubishi galant problem. Engine running rough. Changed sparkplugs, added premium fuel and bottle of seafoam injector cleaner. I have no computer codes. Was running fine then suddenly had no quick acceleration. Feels wimpy and will only accelerate if gas pedal is slightly touched so that it builds momentum and speeds up gradually. If you press the gas pedal to the floor such as when you are passing it will hit 3500 rpms and the rpms will drop and then rise on their own as if I was pressing the gas pedal up and down. When at idle and in neutral the rpms rise and fall when I press the gas pedal to the floor. The rpms should be staying up until I let off the gas pedal. What is the problem? computer, coils, fuel pump?

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  • blmacias Aug 18, 2009

    Well figured out what the problem was which was very strange that the care kept running this long. The problem was that the timing belt jumped positions when the smaller belt broke inside the timing belt cover.

  • Anonymous Mar 30, 2014

    When pushing on gas doesnt want to accelerate properly. Tacs high and doesnt shift or tac doesnt move. No power on hills even with gas pedal to floor. A burning smell from front to back. No engine light. Oil pressure and battery is normal. What could cause this?

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Start with IAC motor, TPS sensor, possible clogged catalytic converter.

Posted on May 30, 2009

  • Eldric Venne
    Eldric Venne Aug 18, 2009

    Seen that before. You got lucky that it didn't break both. Thank your lucky stars.

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Tps switch for sure

Posted on Jul 09, 2012

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Posted on Mar 22, 2012

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It could be your MDP sensor (Manifold Differential Pressure) sensor. My 1999 Galant had a similar problem. It would accelerate fine up to about 20 - 30 mph, then the engine would stumble. It felt just like a cylinder misfire. On mine though I did get an EGR flow malfuntion trip on the ODB code.

What I did was unscrew the MDP sensor, which is located right on top of your intake manifold, and then I found the tiny hole for the sensor had some kind of crust covering the hole. I poked out the crust with a paper clip and tried my best to **** out the hole and blow out the dust and then screwed it back on. The engine stumbled just a little going up a hill on the first test run, then ran fine. No problems since.

Posted on Aug 18, 2009

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