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Old September 24th, 2014, 05:25 AM   #1
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Misfire Misfire and Misfires!!!!



So my check engine light was on and this is what I get, I changed the plugs to oem ones last month thinking it would solve the problem, did a power balance test and all the coils seem to be fine and the car runs strong currently at 149,219 miles and climbing. some people on the Facebook page said that there was was a ecm update at honda that took care of this problem. anybody ever had that done????
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Old September 24th, 2014, 08:54 AM   #2
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We need a little more background. Has your 100k+ maintenance been done ? You said the car runs fine, does it throw you into limp mode? Have you over reved lately. Being it's on all cylinders, I would say a sensor is going out, you jumped or timing may be off (but you said the car runs fine and other codes would show).

How and when did all of this start. Was any part changed around the same time ?

Maybe a Cam or crank sensor going bad. Could also be the EGR stuck open. NGK or Denso Iridium plugs should also be used
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Old September 24th, 2014, 10:06 AM   #3
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Do you start your car up and let it warm up before driving it or just take off? I noticed my car if I didnt let it warm up it would do the same thing. Would say all cylinders were misfiring. Now I let it warm up first before driving it and it hasnt done it since.
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Old September 24th, 2014, 10:48 AM   #4
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I let it Sit for about 5 mins before starting off.
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Old September 24th, 2014, 10:56 AM   #5
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Quote:
Originally Posted by accord325 View Post
We need a little more background. Has your 100k+ maintenance been done ? You said the car runs fine, does it throw you into limp mode? Have you over reved lately. Being it's on all cylinders, I would say a sensor is going out, you jumped or timing may be off (but you said the car runs fine and other codes would show).

How and when did all of this start. Was any part changed around the same time ?

Maybe a Cam or crank sensor going bad. Could also be the EGR stuck open. NGK or Denso Iridium plugs should also be used
I haven't over revved. I got the car In december of last year and this started about 3 months after so I just recently changed the plugs last month, the funny thing is that it comes on and then goes off by itself so you might be right about a sensor going out. I don't know about the 100K service being done yet. I'll look into that on monday, also It never goes into limp mode.
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Do you start your car up and let it warm up before driving it or just take off? I noticed my car if I didnt let it warm up it would do the same thing. Would say all cylinders were misfiring. Now I let it warm up first before driving it and it hasnt done it since.
I let it Sit for about 3 mins before starting off.
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Old September 24th, 2014, 10:59 AM   #6
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check your valve lashes.
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Old September 24th, 2014, 02:19 PM   #7
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I say came or crank sensor. See if you can get a vid of the engine running (in engine bay and exhaust) and post it on here. Mis fire on all 6 should have the car running like $hit.
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Old September 24th, 2014, 04:58 PM   #8
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ECM issues can cause this. There was in fact an update that most cars don't have however the problem should have presented earlier if this was the case.
I'd honestly say timing, since my car ran fine for weeks with a full tooth difference in timing except for the misfire codes.

I believe the map sensor can also somehow cause this.
0-60 video and engine bay running video can help figure if this is engine or sensor or computer.

I want to say it's as simple as valve lash, however that shouldn't effect all 6 cylinders.

Have you ever gotten a "sensor stuck on lean" code?
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Old September 24th, 2014, 05:03 PM   #9
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^ exactly. How would lash go out on all 6 ?

Has to be cam sensor, crank sensor, or overall electrical (sensor,map,ECM)
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Old September 24th, 2014, 05:30 PM   #10
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Quote:
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^ exactly. How would lash go out on all 6 ?

Has to be cam sensor, crank sensor, or overall electrical (sensor,map,ECM)
There was something that came up in a search about timing or leaking valves or bent rods or something about the MAP sensor possibly causing this too somehow.

I know that timing could be an issue. Had this exact problem first hand when my belt slipped during an installation. And there is a known recall for some tensioners causing slipping issues.

There's also that computer update thing.

I'm taking my bet on timing though. It is also the hardest to check.
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Old September 24th, 2014, 05:48 PM   #11
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^ time is super easy to check, at least to me.

Move PS pump out of the way and take the timing covers off (crank pulley also)
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Old September 24th, 2014, 08:22 PM   #12
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Crank pulley I can't tell if it's off by one tooth without at least the pulley off.
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Old September 25th, 2014, 11:28 AM   #13
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What year is your accord? There is a pcm update for 03-04 V6 Accords that have misfires codes stored. Google service bulletin 04-042.
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Old September 25th, 2014, 12:11 PM   #14
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Quote:
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What year is your accord? There is a pcm update for 03-04 V6 Accords that have misfires codes stored. Google service bulletin 04-042.
I need to look into this mine is a 2003 6-6.
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Old September 25th, 2014, 12:15 PM   #15
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I also forgot to add but about 2 months ago I did an EFI flush thinking that it would help but to no avail.
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Old October 6th, 2014, 05:44 AM   #16
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2003 Honda Accord J30 6 6 Cold Start: http://youtu.be/yutAK6iJNN4

Here's A cold Start Video.
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Old October 6th, 2014, 04:17 PM   #17
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Recently had a similar problem. Didn't plug one ignition coil back in properly and it caused random misfire codes in all the cylinders.
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Old October 6th, 2014, 04:49 PM   #18
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mine has the same problem, did the pull and check for each coil pack all seemed fine. gonna remove the injectors and see if any are clogged up (visual inspection and prolly run some injector cleaner through them)
this is causing me to have weird vibrations under acceleration and its extremely annoying
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Old October 11th, 2014, 06:36 PM   #19
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Quote:
Originally Posted by rave93 View Post
mine has the same problem, did the pull and check for each coil pack all seemed fine. gonna remove the injectors and see if any are clogged up (visual inspection and prolly run some injector cleaner through them)
this is causing me to have weird vibrations under acceleration and its extremely annoying
I haven't messed with the injectors yet my appointment with the dealer is on monday, I'll see what they say first before I do a tear down.
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Old October 27th, 2014, 09:55 PM   #20
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awesome, let me know. i got a new set of codes from a random cel, p0171 and p0174 so still confused as to whats going on haha
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Old October 29th, 2014, 10:40 PM   #21
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What spark plugs went in?

Solved my issue by ensuring good connections all around electrically, all grounds, all wires, and fresh spark plugs of the correct heat level. Problem free so far.

The plugs that were part of the problem were 1 month old.
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