S2000 Under The Hood S2000 Technical and Mechanical discussions.

AP1 Misfire Once Again

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Old Jan 9, 2018 | 09:23 AM
  #11  
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Originally Posted by Soviet
I would recommend reading the Misfire thread on here. There are a whole number of things that can cause misfires and that thread goes into a good amount of detail.
I've personally seen bad coil packs and injectors so it is possible that something else may have failed. See if you can substitute parts with a local?

That voltage malfunction sure is peculiar though.

I’ve replaced the spark plugs and coil packs 19k ago, I cleared the codes and driven 200 miles it has not come back on yet. When it does I’m going to replace the plugs and do a compression check while I’m there
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Old Jan 9, 2018 | 09:29 AM
  #12  
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Do you have a trickle charger you can put on the batt to insure its 100% when you go to start on these cold mornings? My first inclination as well, was that the coil packs just weren't getting full voltage at that particular start up and triggered the cel, but check one thing at a time, easiest first.
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Old Jan 24, 2018 | 06:20 AM
  #13  
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After 700 miles of some mixed driving, my CEL came back on this morning on the way to work. Was idling at a red light, and put it in 1st to start moving and it popped up couple seconds later.
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Old Jan 24, 2018 | 06:25 AM
  #14  
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Spark plugs changed 19k ago
New coil packs installed 19k ago
Rebuilt head/valve adjustment 15k ago
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Old Jan 24, 2018 | 06:31 AM
  #15  
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Originally Posted by rpmgem
Spark plugs changed 19k ago
New coil packs installed 19k ago
Rebuilt head/valve adjustment 15k ago
You still have several more things to rule out. I would try swapping injectors with someone else personally.
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Old Jan 24, 2018 | 08:08 AM
  #16  
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Could be some tight valves. Have you checked the valve lash since the head rebuild?
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Old Jan 24, 2018 | 08:58 AM
  #17  
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Originally Posted by Soviet


You still have several more things to rule out. I would try swapping injectors with someone else personally.
Ill try listening to the injectors with a screwdriver, any sure tell sign an injector is going out?
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Old Jan 24, 2018 | 09:01 AM
  #18  
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Originally Posted by s2000Junky
Could be some tight valves. Have you checked the valve lash since the head rebuild?
I have not checked the lash, or have done a valve adjustment on my own. I’m very comfortable on working on my own car, but leave the areas I’m not fully aware of how to do to InlinePro
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Old Jan 24, 2018 | 09:32 AM
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Checking the valves is pretty easy, you may as well give it a shot now just to see.
Pulling the valve cover is a ten minute thing in these cars, then you just need the correct size feeler gauges with a 45* bend on them to do a very quick spot check for tight valves. (.008 / .010)

Compression test and leakdown test, man. That's where my misfire / idle rumble ended.
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Old Jan 24, 2018 | 09:54 AM
  #20  
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Originally Posted by Soviet


You still have several more things to rule out. I would try swapping injectors with someone else personally.
Let me tell you my story....

Had misfires... same type of codes..... replaced plugs, coil packs, etc....

Sent my injectors out for cleaning.... all came back good (supposedly)....

Misfire continued.

Borrowed a friends injectors (he's SC'd and doesn't use the OEM)....

Misfire is gone.... one of the injectors turned out to be bad. Replaced the injector for cylinder 2 after moving injectors around to find the bad one.

Still haven't figured out how I was getting misfire codes for all cylinders when only one was bad!
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