not camaro retlated but some other insight would help.

Discussion in 'Engine Topic' started by LayZ, Jan 6, 2017.

  1. LayZ

    LayZ Veteran Member

    Jun 9, 1999
    NJ. US
    2008 caravan 4.0 liter. Threw code p0300 then p0303 misfire in cylinder 3. Replaced the coil pack for that cylinder, spark plug still looked good. It's still throwing the 303 code but now it's throwing a 0203 code, injector circuit malfunction #3. what does that mean? injector bad or more serious?
    car will run fine for awhile, then maybe about 30-45 mins it will run real rough but still drive. On short trips it's ok but stop the car and restart it runs rough but still drives.
    If it's an injector I don't mnd changing it, it's the circuit thing that has me guessing it's not, how would you go about fixing that?
  2. tom3

    tom3 Veteran Member

    Aug 1, 1999
    I'd start with fuel pressure check. Dying fuel pump or dirty filter? Swap a plug from another cylinder.
  3. Mike N

    Mike N Moderator Staff Member Lifetime Gold Member

    Jan 13, 2002
    Spencerport, NY.
    Measure the resistance of the suspect injector and then measure the resistance of a known good one. If they're more than 5-10 ohms different, you likely have a bad injector.

    Or you can swap the suspect one and another one and see if the code follows the swap.
  4. LayZ

    LayZ Veteran Member

    Jun 9, 1999
    NJ. US
    OK i'll give it a try.


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