Question about 2004 Isuzu Rodeo

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2004 Rodeo Misfire on Cylinder 4

I have a 2004 rodeo with 3.5ltr. The engine has been missing for a quite some time while excillerating and now my check engine light is finally stuck on, so I can find out what it is and it says, it's a misfire on Cylinder 4. What's the possiblity of a Denso Iridium SXU16HPR9 spark plug going bad at 40,000mi? Can you tell me which plug is on Cylinder 4? I have checked the two middle ones and front left and they seem to look ok and as far as I can tell the cables look ok too. Can they look ok and still be bad? It starts fine and seems to idle ok too.

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  • Damundson Oct 23, 2008

    Thank you for the info. I replaced the plug on cyl 4 even though I didn't see any evidence. I also don't see any evidence of fire going down side of procelain. It seemed to have more power and I had the code erased. It started acting up again, but not as bad. The check engine light came on again, but didn't stay on. It still said misfire cyl 4. When it starts flashing I take my foot off the peddle and it smoths out and goes away. Still sould like wire or something else.

  • Damundson Oct 24, 2008

    I swapped out the coil wire with front drivers side erased code and it still says misfire on cyl 4 P0304. Any other ideas? Seems to hesitate more when cold and on acceleration. Intermittent.

  • Damundson Oct 24, 2008

    Plug wire and coil are one piece and shows no evidence of burning.

  • Damundson Oct 24, 2008

    The coil and boot are one piece. See full view. This is what I swapped out.

  • Damundson Oct 24, 2008

    I am thinking I may have to resort to taking it in. I cannot get to injector four with long screw driver and there are no exposed wires on the connector or the coil to check with volt meter.

    Thank you for all your help!!

    If you think of anything else let me know!!

  • Damundson Oct 28, 2008

    I have not brought in to service station yet. I put fuel injector cleaner in on a full tank yesterday. How long does it take to start working? I have driven about 15mi and still no difference. Do you have a diagram of my 3.5ltr with component locations? I am still determined to find the cyl 4 injector to see if it is clicking off and on.

  • Damundson Oct 29, 2008

    Do you have a diagram or manual that shows how to get to the Fuel Injector?

  • Damundson Oct 29, 2008

    Under the cover is some kind of manifold or something. If I remove it, I am guessing there are gaskets to replace. I will try to get a hold of a camera and send a picture with the cover off.


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These are Famous for bad injectors ,, poor design ,,,, and it is a pricey repair ,,,, and when one goes ,, the others follow

Posted on May 08, 2013

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Cylinder 4 is on the drivers side it is middle plug goes 2,4,6. it is possible for plug to go bad at mileage. look on the side of plug see if you can see a black mark on side this will be evidence of fire going down side of porcelain also look on plug wire for any trace of arcing. it is most likely a bad plug or wire on cyl 4

Posted on Oct 22, 2008

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  • TripleTauto
    TripleTauto Oct 23, 2008

    YES sounds like a wire see if you can swap wire with another cylinder and if code reads misfire on that cyl you will know for sure it is wire

  • TripleTauto
    TripleTauto Oct 24, 2008


  • TripleTauto
    TripleTauto Oct 24, 2008

    ok this has the 6 coil packs on each plug. you swapped the coils or just the boots? if just the boots then swap coil with another cylinder.and check and see if misfire moves to that cyl

  • TripleTauto
    TripleTauto Oct 24, 2008

    NEED TO CHECK vacuum lines and injector orings for vacuum leak check compression on that cyl wiring on coil pack. listen to injectors with a long screwdriver hold it on injector and to ear. will hear injectors clicking make sure 4 is clicking

  • TripleTauto
    TripleTauto Oct 24, 2008

    black/orange is 12 volt power black is ground and red/yellow is signal from computer

  • TripleTauto
    TripleTauto Oct 28, 2008

    cylinder 4 injector will be the middle injector you will have three on each side.

  • TripleTauto
    TripleTauto Oct 29, 2008

    no i dont. there may be a plastic cover over engine if so remove that and should be able to see more

  • TripleTauto
    TripleTauto Oct 29, 2008

    you dont need to remove manifold


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