S2000 Under The Hood S2000 Technical and Mechanical discussions.

Misfire only at idle when fully warmed up.

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Old 03-14-2013, 10:47 PM
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Default Misfire only at idle when fully warmed up.

?
Old 03-15-2013, 12:23 AM
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Swap the coil from 1 into 2 and reset the codes. If it comes back on with a misfire in 1 then its your coil. Do the same thing for 3 and 4. Good luck.
Old 03-15-2013, 03:05 AM
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I had the same problem a few weeks ago, it ended up being the coil packs so I bought 4 new ones from majestic honda website, 214 for all 4. My car would bog down when I would floor it and drive crappy and misfire under 3k rpm, but above 3k it drove normal.
Old 03-15-2013, 04:12 AM
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Ive got a set of ap2 coils with 35000kms on them, 60 shipped for all 4, used them on the dyno for my FI build, MINT shape !
Old 03-15-2013, 10:13 AM
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Had this issue and it threw a CEL of the same codes

I did new plugs and a valve adjustment and the CEL went away. It still idles a little wonky now and then but it seems to have smoothed out.

Good luck!
Old 03-15-2013, 10:24 AM
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Yeah do your valve adjustment and check the coils/plugs. I just had a misfire issue on mine and with the valve adjustment it went away.
Old 03-15-2013, 11:44 AM
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same problem wih my 02 only 66K ive narrowed it don to a bad fuel injector, have a new set on the way.
Old 03-15-2013, 12:10 PM
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Originally Posted by hustle_kaing
I had the same problem a few weeks ago, it ended up being the coil packs so I bought 4 new ones from majestic honda website, 214 for all 4. My car would bog down when I would floor it and drive crappy and misfire under 3k rpm, but above 3k it drove normal.
Thanks, i'll get some new coil packs and see if that helps.

Originally Posted by s2kt3
Ive got a set of ap2 coils with 35000kms on them, 60 shipped for all 4, used them on the dyno for my FI build, MINT shape !
you got a pm!

Originally Posted by Simplegreenvr6
Had this issue and it threw a CEL of the same codes

I did new plugs and a valve adjustment and the CEL went away. It still idles a little wonky now and then but it seems to have smoothed out.

Good luck!
I'll be doing a valve adjustment soon and report back, I need to get one done anyways.

Originally Posted by Manga_Spawn
Yeah do your valve adjustment and check the coils/plugs. I just had a misfire issue on mine and with the valve adjustment it went away.
Thanks and will do.

Originally Posted by hybridb18
same problem wih my 02 only 66K ive narrowed it don to a bad fuel injector, have a new set on the way.
If it is injectors you should tell me! I'm going through a whole list of things and man it's getting pricey...
Old 03-25-2013, 09:50 PM
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That's not true at all

My friends car misfired. It was the valves all being too tight. Valve adjustment did it

I unplugged each injector at idle and the car stumbled regardless of which was pulled.

That's why I did the adjustment first and it went away
Old 03-26-2013, 12:19 AM
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Just get the valve adjustment and let them take a look at everything else. I did that with mine when I had a misfire in cylinder #4 and it saved my engine from being destroyed. That's just a worse case scenario though. Good luck, but better to be safe rather than sorry.


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