98 XJ Cylinder 2 Misfire after flushing heater core?? - JeepForum.com
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post #1 of 3 Old 12-16-2017, 04:48 PM Thread Starter
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98 XJ Cylinder 2 Misfire after flushing heater core??

Today i sought out to resolve my no-heat issue on my 98 xj by flushing my heater core (which worked!). However, my first startuo after burping my coolant I got code P0302 for cylinder 2 misfire. I have no obvious symptoms before and it seems likely that its not a coincidence that this happened after i was messing around that area. I don’t see anything knocked out or loose so can anyone think of anything i might’ve done? Much appreciated!

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post #2 of 3 Old 12-16-2017, 05:15 PM
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I'm going to guess it's time for a complete ignition tune up.

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To diagnose what is going on, you most likely have a sparkplug wire that is cracked. With the electricity flowing through the ignition wire to the number 2 spark plug, it is traveling the path of least resistance. The electricity is able to arch out of the plug wire & ground out on the engine block. A simple test when it is dark, is to start the Jeep, open the hood, & use a spray mist bottle & spray the spark plug wires with water. If you see electrical sparks, you have failed ignition wire(s). Other possibilities are water inside the distributor cap, which would be an indication of a cracked distributor cap.

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post #3 of 3 Old 12-16-2017, 05:16 PM
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I would check the spark plug wires at both ends, the plugs and the distributor, for any loose or dislodged wires. The most likely cause for the misfire is some dampness from the flushing which should dry up by itself after a driving a bit. As MM suggested, if it is time for a tune-up, buy top quality original equipment type tune-up parts and freshen things up.
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