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P0302

201 Views 7 Replies 5 Participants Last post by  Chuzz
I've been having an intermittent misfire in cylinder 2. I changed my spark plug, didn't fix it. Then I changed my coils, still would get the misfires. It's doesn't happen ever day it which makes me think it's electrical but I'm not sure. I added some fuel injector cleaner in my tank to see if that helps, if not, then I'm going to pull the injector in cylinder 2. Need help. Thank you
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Kind of indicates it could be the #2 harness connection (or wires leading to it) as it doesn't move when you swap the coils.
You did clear the code after the swap right?
 

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Discussion Starter · #7 ·
I cleared the code after I changed spark plugs and once again after I changed the coils. I bought the duramax plugs from auto zone. I'm going to inspect the harness this weekend and see if theres anything that could be causing it to ground. I'll probably put the original coils back on as well.
 

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I'd recommend that you stay with the OEM plugs. Nippendenso # 9091901275. Having worked for Autozone as a parts manager and assistant manager, I saw the poor quality of the parts they sell. I DO NOT purchase anything from Autozone anymore. I go to NAPA first and then the dealership. Anything electrical should always be OEM dealer parts.
 
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