Question about 2000 Mitsubishi Galant

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Stalling Trouble code P0300 tells me it is a random misfire !   Ok so that really doesn't tell me anything.  It is running like #%#^  and losing power at red lights,  drive thrus, and idle.   Once it gets passed a speed of 25mph or so it is not a problem.  Can you give me some ideas of what to look for ?  Oh and the check engine light is on  and  spark plugs were changed about a month ago.

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  • lionelcastr0 Oct 28, 2008

    i have the same problem with my 99 galant v6. its running like **** and im trying to figure out what is wrong with it as well. the car does the same exact things. i also put in new spark plugs but that was after it started jerking. it has a new distributor rotor and cap and wires. i took it to a shop to get it diagnosed and they said it could be one of many problems and i said wtf?! they said it could be the distributor ($350 part only) or the crankshaft position sensor ($120 part only) and or the throttle position sensor ($140 part only) and the labor would cost alot if it was the cps or tps because of the fact that they are behind the timing belt so i might as well change the timing belt and water pump at the same time.

  • Ethanspringt Mar 05, 2009

    I have a 00 galant 4cly At. Car gives me a p0300.
    I have tryed every thing to this car to fix problem such as the tps, the cps, 2 mass air flow metters, 8 coils, plugs and wires, and I have checked for vacume leeks. I have no clue what the problem is. It will spit and sputter at a red light with your foot on the break. It stops while in nutral and has no problems while in moshion.. what could the problem be??
    Allso this is the 5th motor I have put in this car and is the only one that has had this problem.. Any help would be aprisheated befor I buy anuther motor from work. Ethan from springfield mo


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If your car has direct injection this can be a nozzle problem and they have to be clean
And adjust or change. Please make these checks first .
Take of the air hose and look at the air flow meter it is sensitive to dirt and often courses
Problem at low RPM just wipe it clean if it is the one that looks like feather be careful
Do not damage it. Next take of the distribution cap and look for cracks around studs
And also check the rotor for cracks ,these cracks courses the spark shot to ground
And therefore misfire. Next check battery voltage at low RPM maybe you are running your car with daylight and the voltage drop is to much, somewhere around 11.6 volts
The ECU starts be effected you should get a least 12.8 at idle 14v at full RPM
If your car has a mechanical fuel pump this problem is very likely bad pump or
Fuel filter you find these items behind the motor just change fuel filter it is tube
Filter. Look for engine oil leakage from fuel pump that’s a sure indication of
Faulty pump. Finally make sure you have been sold right type of sparkplugs
Last time this can be indication of to cold sparkplugs .

Posted on Jul 13, 2008

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My issue after 15 months of this and 2 Mits. dealerships several times and a couple of other shops, I found Woody's Auto Service in my town and they found it right away. For my car it was the evaporator solenoid. What do you know, such a simple fix, and much less expensive than all the other repairs done that supposedly fixed the problem. They listened to me and my car and even rode with me to the gas station and experienced my issues which were always worse just after filling up with gas. I will never go to the dealership again...Woody's is the place for me!

Posted on Apr 09, 2009

Change both of the o2 Sensors and the mass air flow sensor this fixed my problem on a 2000 galant.. These three things can cause major problems....

Posted on Nov 05, 2008

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P0300


Im assuming your asking about the ODB-II codes, this code,P0300 Random/Multiple Cylinder Misfire Detected.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
Here are a few things that could be the cause.
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

    I would start things out with a tune up, new plugs and wires, wires break down after time and could be grounding out, or arcing between themselves causing a misfire.
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    DTC P0300 - Random/Multiple Cylinder Misfire Detected
    Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

    A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

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    Hi there,

    A P0300 diagnostic code indicates a "random" or "multiple" misfire.


    Unfortunately, P0300 doesn't tell you specifically which cylinders are mis-firing, nor why (code P0301 would indicate cylinder #1; P0302 would indicate cylinder # 2 etc). This means there could be an issue with any number of components/circuits relating to the ignition/combustion circuits.


    I would recommend you check for the following:

    • Faulty spark plugs and/or HT leads
    • Faulty coil (pack)
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    Sometimes the underlying cause of a random misfire is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold, unmetered air getting past the airflow sensor, or even an EGR valve which is stuck open.



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    A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why. it could be any of the following A code P0300 may mean that one or more of the following has happened:
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    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
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    • also
    • Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

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    P0300


    Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.

    A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

    A code P0300 may mean that one or more of the following has happened:
    • Faulty spark plugs or wires
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector(s)
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Stuck/blocked EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer

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