Question about 1999 Mitsubishi Galant
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?
Tps switch for sure
Posted on Jul 09, 2012
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Posted on Mar 22, 2012
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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Posted on Jan 02, 2017
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