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1996 Mercury Villager Question: rpms erredic when warm



carlo, Azusa, CA, January 20, 2010, 16:15

my villager runs fine when cold. when it warms up the rpms jumps up and down and i pulled over i saw the catalytic converter was red hot and it was running rough what can the problem be?

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  • Answer #1

    January 22, 2010, 20:29

    Sounds like the engine is misfiring. Get the diagnostic trouble codes to find out what is triggering the misfire.
    Read this for info on what can cause this: http://repairpal.com/OBD-Code-P0300

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