Question about 2004 Dodge Grand Caravan

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Changed spark plugs, runs rough, check engine light is on

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Could be many of things. you gotta know what code is showing up to triger that light. you can have a mechanic give you the code or you can try to do it on your own.

  • On many 2001 and newer models, holding in the trip odometer reset button while turning the key to RUN will start a self test, with a readout on the odometer. It will also activate all instrument panels, one at a time. We do not know if this will show computer codes, or whether it only tests the instrument panels. At the end, it may show a few odd codes that are firmware versions and not error codes.
  • On most cars, the codes will read out if the engine light is on - all you have to do is put the key into the RUN position.
  • Normally, to get codes, you put the key on OFF and then rapidly do OFF-ON-OFF-ON-OFF-ON (on some cars you have to do four or five, not three, OFF-ON cycles). On our test 2002 car, the key did not go back to unlock, so it was ACC-ON-ACC-ON-ACC-ON.
    • You may have to have the parking brake firmly set for the codes to show!

Posted on Jul 11, 2010

  • TaxiVan Jan 18, 2011

    Use dealer plugs and wires (especially the wires). Certain vehicles, including my 02 Grand Caravan rated for FLEX fuel, require an exact amount of resistance in the plug wires. I had the same problem. Not only did I need the dealer plugs and wires, but the stress of the wrong ones was the tipping point for my valve cover gasket and intake manifold gasket. These gaskets commonly go bad and when they do, your van will hardly idle, much less run.

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