Question about 1997 Buick LeSabre

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Code P0300 random/multiple cylinder misfie

Chaged sprak plug and wires stiil mising

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  • tubby_137 May 11, 2010

    Did you change the throttle positioning sensor? What vehicle?

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I have the same car and had the same problem.I found that if you use aftermarket wires they don't work as well as the acdelco wires from the dealer.I recomend you spend the little extra and put the dealer wires on.The 3.8 ignition system is picky about the right wires.I changed out the after market wires and haven't had a problem in two years.

Posted on Mar 29, 2009

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2005 Buick Las 4 door Code p0300


Not much.
Code 300 is for a random miss. The engine computer has detected more than one cylinder that is not producing power, but no one cylinder is constant.
Until you get a code like 301 or 303 its a guessing game. 301-306 would tell you which cylinder is being the problem.
The cause could be fuel or spark.

Aug 30, 2015 | Buick Cars & Trucks

1 Answer

I have jetta 99 that report Code P0300


The ECM has detected random multiple cylinder misfiring (code p0300). Possible causes are spark plugs,high tension leads injectors ignition coils wiring and low compression As it is random suspect coils and wiring

Mar 06, 2013 | 1999 Volkswagen Jetta

1 Answer

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.
  • Jul 05, 2012 | Cars & Trucks

    1 Answer

    Code reads "random/multiple cylinder misfire


    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.

    Symptoms may include:
    the engine may be harder to start
    the engine may stumble / stumble, and/or hesitate
    other symptoms may also be present

    Causes: 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

    Possible Solutions:
    If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

    If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

    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.

    Hope helps.

    Apr 25, 2011 | 2000 Buick LeSabre

    2 Answers

    Cylinder 5 and im also getting p0507 idle is higher then expected. ive change plugs wire cap button cam sensor and distributor. but now its throwing the codes p0300 and p0507 it goes from p0300 to p0305...


    po 300 is random/ multible cylinder misfire detected po507 idle system rpm high-- go to this site for the po507 meaning--www.obd-codes.com/p507 === please go to this site for the po300 code---- www.obd-codes.com/p0300

    Random/Multiple Cylinder Misfire Detected have a good day !!

    Feb 15, 2011 | 1997 GMC Sierra

    1 Answer

    Multiple missfire code po300


    P0300 Diagnostic Code - 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.

    Symptoms may include:
    * the engine may be harder to start
    * the engine may stumble / stumble, and/or hesitate
    * other symptoms may also be present


    Causes: 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

    Possible Solutions:
    * If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

    * If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

    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.


    Test it and keep us updated.

    Jan 04, 2011 | 1999 Chevrolet Tahoe

    2 Answers

    What does code p0300 mean for a 2004 chevrolet cavalier-car is sputtering and stalling when idiling


    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.

    Symptoms may include:
    * the engine may be harder to start
    * the engine may stumble / stumble, and/or hesitate
    * other symptoms may also be present

    Causes: 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

    Possible Solutions:
    - If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
    - If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

    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.

    Keep us updated and remember to rate this answer.

    Jan 01, 2011 | 2004 Chevrolet Cavalier

    2 Answers

    1996 corvette didn't pass emissions codes po117 and po300 i just put new engine n tune up what could be wrong now


    p0300 is usually a random cylinder miss-fire code, and i think that p0117 is coolant temperature sensor? Try replacing the sensor, could also be the reason for the other code, as a malfunctioning coolant temp sensor will affect engine timing.

    Dec 14, 2010 | Chevrolet Corvette Cars & Trucks

    1 Answer

    Engine is chocking by aplying on gas, did plug code reader the code is P0300 01/09 pls help


    p0300--random/ multiple cylinder misfire detected. could be plug wires plugs coils etc.

    Oct 31, 2010 | 1996 Dodge Ram 1500 Club Cab

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