P1399-Random cylinder misfire - Honda Accord Forum : V6 Performance Accord Forums
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Old August 2nd, 2010, 08:27 PM   #1
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P1399-Random cylinder misfire

The car:
2000 Honda Accord EX-V6 with 130k miles
The long story;
We went to Mayhem Fest last night (the show was awesome) and when we came out to go home, the battery was ALL THE WAY dead. It may be the original battery, may not, gonna replace it soon anyways. We got jumped off and everything was fine...Till tonight. I hopped in the car to take a movie back and when it started up, the check engine light started flashing. The car ran really rough and I could feel it skipping. When I let off the brake while I was in D, I could feel the car hopping forward in little surges. I drove STRAIGHT to Auto-Zone.

P1399-Random misfire detected
Probable cause-Blocked EGR valve or Valve clearance out of range

I love this car, it is my second 2000 Honda Accord (the one in my pics is not the same one, although it looks EXACTLY like it). Does anybody have any ideas?
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Old August 2nd, 2010, 08:47 PM   #2
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Search for Cleaning the EGR port….it was a TSB. Pretty cheap and easy to do yourself.

If you havent had the EGR tsb done, go to a dealership, it should be free there
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Old August 3rd, 2010, 08:47 AM   #3
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How long was the warranty extended? My car has 130,000 on it as of now. I pulled each coil wire this morning one at a time to see which cylinder was not firing, and it is the front-center (no 5) cylinder. I am currently waiting on the tools to take the plug out.
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Old August 31st, 2010, 08:32 PM   #4
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It wound up being a bad coil. I replaced the coil and all problems were gone...until 2 days ago. NOW I have a misfire on #5 AND #1 AND a random misfire...WTF? Gonna dig into it this weekend.

MVP, I use O'Reiley's religiously. They have lower prices than all of the competition.
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Old September 6th, 2010, 12:59 AM   #5
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Check your fuel pressure, the pump could be going bad.
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Old September 11th, 2010, 08:44 PM   #6
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Replaced all 6 spark plugs with e3 spark plugs today...expensive as hell but car runs like a top now. MAYBE even a little better than stock. Thanks for all the input!!
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