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Misfire Mystery dtc P1399 - Need Help to Solve

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Old 07-19-2008, 04:26 PM
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Default Misfire Mystery dtc P1399 - Need Help to Solve

I have been doing alot of research and troubleshooting on this mysterious misfire issue, which a number of S2k owners seem to have had including me, but I have not come across a strong understanding of the exact cause nor the exact repair.
I have an '02 S2k with 50k miles on it and here is the situation:

May 2007, CEL comes on. Error codes = misfires on all cylinders, multiple misfires, and P-1399 "Manufacturer Control Ignition System Error". We checked sparkplug gaps which were within spec and replaced the fuel injectors with brand new OEM ones. We reset the system and the CEL went away and everything was fine for one year until.................

Fast forward to May 2008. CEL returns
Same error codes as before, Multiple misfires, with a new twist, when the car is idling for more then 3 minutes, the CEL light blinks repeatedly until you begin moving. The idle and acceleration seem to be a bit off as well on occasion. So we replaced the spark plugs with brand new OEM ones and reset the system.

Everything is fine for a week and then the CEL returns with the same error codes.

Can a brilliant S2ki member please help enlighten us on how to fix this. I was thinking valve adjustment might be the next step, but am hoping for a better and more accurate fix. Thank You.
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Old 07-20-2008, 04:25 PM
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Wait until the car throws a permanent DTC of the specific cylinder that is misfiring, and don't clear the DTC's so whatever shop looks at the car can get the stored freeze data.
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Old 07-20-2008, 05:34 PM
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Would you be able to post the MAP and TPS voltage at idle with the engine fully warm up?
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Old 07-22-2008, 02:44 PM
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did you try the coilpacks? The igniters in the coils are known to go bad in Hondas in general.
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Old 07-27-2008, 08:33 AM
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Thanks for the comments, here is the latest update on the mystery.

We ran a compression test on the engine.
Cylinder 1 = 150psi
Cylinder 2 = 255psi
Cylinder 3 = 245psi
Cylinder 4 = 250psi

So clearly there is an issue with Cylinder 1. So we pull the cylinder head and do some inspection. No indication of any unusual wear or markings. We also used a boriscope to look at the cylinder wall and top of pistons, all of which looked normal.

The gaps on the Intake Valve's for all cylinders was within spec at .09in.

Then we checked the Exhaust valve's, all of which were a bit loose ranging from .05 - .08. We adjusted them to spec at .010in.

We then did another compression test and no change in compression. Cylinder 1 still off.

We reset the CEL and fifteen minutes later it was back on with the same misfire codes, P300, P301, P302, P303, P304, P1399.

I am totally at a loss on how to fix this or what to do next. The car sounds fine and seems to run fine outside of occasional idle vibration.

Motorheads Help................
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Old 07-27-2008, 10:57 AM
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it's got either shot rings or a burned valve. Needs a leakdown test.
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Old 07-27-2008, 11:12 AM
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blinking CEL means if you keeping running the car.. it can damage the CAT.
low compression can cause misfire codes..
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Old 07-27-2008, 11:31 AM
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Thanks Slows2k and R3DS2K

Will find a garage that can do a leakdown test.

Why would low compression in one cylinder throw misfire codes for all cylinders?
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Old 07-27-2008, 11:46 AM
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the first cyl. ( 150 ) is a bit low , but even with a bad cyl it would not throw multiple miss codes, there is a possible electrical problem and they way its acting it could be a control sensor.... some sensor the ECM uses to determine ignition timing like TPS or a position sensor. Somtimes theses sensors will stop working and not throw a code.

Do a leak down test on #1 and if the cyl is toast rebuild and see how it acts after.....Good luck
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Old 07-27-2008, 02:01 PM
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low compression can cause misfires
another you can do is check for fuel pressure.. but the compression test already shows #1 cylinder has an issue

below from alldata
DTC P0300: Random Misfire

P1399 is a random misfire code and Honda/Acura has reported for various models that this could be caused by clogged EGR ports. In addition there is the possibility that the valve cleareance specification may be out of range.

* If the misfiring is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0304) will be stored.
* If the misfiring is frequent enough to damage the catalyst, the MIL will blink whenever the misfiring occurs, and DTC P0300 (and some combination of P0301 through P0304) will be stored. When the misfiring stops, the MIL will remain on.
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