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Old 03-19-2011, 11:11 AM
bennyb53's Avatar
bennyb53 bennyb53 is offline
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2019 Sentra
2002 Altima
 
Join Date: Jan 2011
Location: Hawaii
Posts: 2,105
Angry Still Working On P0300

I replaced the spark plugs and still misfire. Two days ago I did the Power Balance test. With engine at idle, simply disconnect the harness from ignition coil. If ignition coil is good, you will notice a drop in RPM. The engine may even stall. Reconnect the harness or the SES light may lit up.

If ignition coil is bad, the engine idle will not change. In my case, #2 cylinder wasn't firing. I confirmed it by doing a spark test and there was no spark. I'm eliminating probable cause one thing at a time.

For P0300 possible cause, you will find it in page EC-274 in Altima Service Manual.
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