Question about 2003 Jeep Grand Cherokee

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#3 spark plug is miss firing check engine light on

#3 spark plug is missfiring check engine light on friend with computer got the read out that sparkplug#3 is missfiring

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Remove all plugs and compare them with each other. Does 3 look different to the others. Look at the plug connectors carefully to see if there are signs of shorting through the insulator to the cylinder head. Check the resistances of the high tension lines from the coil to each plug in turn. If one seems much higher than the rest then this will need to be replaced

Posted on Jul 04, 2010

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