Question about 2000 Daewoo Lanos

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Number two spark plug keeps mis fireing. rough

Number two spark plug keeps mis fireing. rough start up when cold

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It may not be the spark plug it could be the spark plug lead itself or where it plugs into the distributer,check for corrosion,replace the lead,also check if the spark plug is full of carbon,if it is you may have a problem in that cylinder...hope this helps.....cheers

Posted on Jul 04, 2010

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P0300 code. Came up checked for spark troubles found nothing good spark good compression something is making the vehicle sound rough should I suspect a weak fuel pump anyone have a common fix


Borrowed from OBD Codes.com:
"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
  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
  • 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/leaking EGR valve / passages
    • Faulty camshaft position sensor
    • Defective computer"

  • StarI suggest you start simple.... replace the plugs and test the spark plug wires. Make sure all connections are tight.
    Star

    Apr 02, 2015 | Cars & Trucks

    1 Answer

    Firing order


    123456 is the firing order replace spark plugs and fuel filter those can all cause rough and misfiring problems also replace air filter

    May 20, 2013 | 1999 Mazda 626

    1 Answer

    Started engine and was running rough Check engine lamp came on Used code reader and found code p0306 Remove plugs Compression test no.6 was 175 and the rest were 150 replaced spark plugs and retry Still...


    You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

    Nov 25, 2011 | 1994 Ford Mustang

    2 Answers

    Replaced sparkplugs and sparkplug wires, now runs rough. I checked connections all tight. check firing orger, looks right. run good till I touched it. Help.


    Check the firing order with the firing order diagram that I have uploaded, and if that does not solve the problem then remove the spark plugs and be certain that there is an even spark plug gap between all of the spark plugs, (see the emission label under the hood for the correct spark plug gap) and be certain that there is not any split-fire or multi-fire spark plugs installed in the engine, because those plugs will not work with an OBD-II system, and a random mis-fire is the least that they will cause if installed in an OBD-II controlled vehicle.


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    Aug 18, 2010 | 2001 Ford Taurus

    2 Answers

    I have a ford f150 that is mis firing on number


    The most coomon thing is a coil. You cant really test without a scanner or way to test coil output. But you should replace the spark plugs and the #3 Ignition coil. Use MOTORCRAFT PLATINUM Spark Plugs only. Number 3 is the 3rd back on the Passenger side. Be sure there is no water/coolant on the spark plug well, if there is coolant, one of the heater hoses may be leaking. Take coils out, using a 7mm socket, be sure to blow out the spark plug hole with compressed air before removing the spark plug. Take the rubber boot off each coil and place some "silicone dielectric grease" in th ecavity for the coil end to keep out moisture. Cyls 1 2 3 4 on pass side, 5 6 7 8 on drivers side. After you are done, remove the positive battery cable for a few minutes to clear the memory and long term fuel trims.

    Nov 11, 2009 | 1997 Ford F150 Regular Cab

    1 Answer

    No check engine light on runs rough while in gear


    Plug Mis-firing (firing-but not adequately) no light and no fire.
    Causes: Spark plug bad, spark plug wire leaking.
    If you can pull the spark plugs - and you find that one of them is wet or very dirty - compared to the others....the you have the wire/plug source identified.

    Oct 14, 2009 | 2002 Ford Taurus

    2 Answers

    Car mis fireing then cut out while i was driveing


    could be a number of things but I would check the coil leads and spark plugs to start with to make sure it is noy electrical

    Jan 24, 2009 | Daihatsu Rocky Cars & Trucks

    1 Answer

    Miss firing


    could be a wire crossed, or it's out of time. since you used motorcraft plugs, did you set them properly to the correct gap? replacing plugs without gapping them can cause the sluggishness, out of time can cause the mis-fires and rough running.

    Nov 27, 2008 | 1994 Ford F150 Styleside Supercab

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