Misfire Mystery dtc P1399 - Need Help to Solve
08-02-2008, 05:57 AM
#21
Originally Posted by jman,Aug 2 2008, 06:44 AM
Thank you to all for feedback and advice.
I had a chance to chat with Hardtopguy (Jeff) during the week. Like many of us he has seen this scenario before and indicated it is actually two separate issues (compression and misfires).
My next steps for fix are:
- Replace injectors with working used ones
- Flush Fuel System
- Replace both intake and exhaust valve's on Cylinder 1
- While doing all this work keep a careful eye out for any damage in the cylinder head
I am waiting on parts and hope to have the work started in the next week.
I had a chance to chat with Hardtopguy (Jeff) during the week. Like many of us he has seen this scenario before and indicated it is actually two separate issues (compression and misfires).
My next steps for fix are:
- Replace injectors with working used ones
- Flush Fuel System
- Replace both intake and exhaust valve's on Cylinder 1
- While doing all this work keep a careful eye out for any damage in the cylinder head
I am waiting on parts and hope to have the work started in the next week.
Did you buy used ones last time? How many miles did you get on your last set before misfires started happening again?
08-02-2008, 07:44 AM
#22
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Originally Posted by jman,Aug 2 2008, 05:44 AM
Thank you to all for feedback and advice.
I had a chance to chat with Hardtopguy (Jeff) during the week. Like many of us he has seen this scenario before and indicated it is actually two separate issues (compression and misfires).
My next steps for fix are:
- Replace injectors with working used ones
- Flush Fuel System
- Replace both intake and exhaust valve's on Cylinder 1
- While doing all this work keep a careful eye out for any damage in the cylinder head
I am waiting on parts and hope to have the work started in the next week.
I had a chance to chat with Hardtopguy (Jeff) during the week. Like many of us he has seen this scenario before and indicated it is actually two separate issues (compression and misfires).
My next steps for fix are:
- Replace injectors with working used ones
- Flush Fuel System
- Replace both intake and exhaust valve's on Cylinder 1
- While doing all this work keep a careful eye out for any damage in the cylinder head
I am waiting on parts and hope to have the work started in the next week.
08-02-2008, 12:08 PM
#23
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Originally Posted by Random1,Aug 2 2008, 08:57 AM
Did you buy used ones last time? How many miles did you get on your last set before misfires started happening again?
08-06-2008, 05:34 PM
#24
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Latest Update - Leakdown Test
So I had a Leakdown Test done on Cylinder 1 and there was air escaping from the Intake Valve's and possibly a small air leak on the Exhaust valve's. Also squirted some oil into the cylinders as part of test and the piston rings are okay.
So it is looking like new valve's for Cylinder 1 and a careful inspection throughout the replacement process for any other visual issues. For the moment I am going to stay away from any work on the injectors and by hopefully
fixing the compression issue in Cylinder one it will in turn solve the misfires.
The work will start next week.
So I had a Leakdown Test done on Cylinder 1 and there was air escaping from the Intake Valve's and possibly a small air leak on the Exhaust valve's. Also squirted some oil into the cylinders as part of test and the piston rings are okay.
So it is looking like new valve's for Cylinder 1 and a careful inspection throughout the replacement process for any other visual issues. For the moment I am going to stay away from any work on the injectors and by hopefully
fixing the compression issue in Cylinder one it will in turn solve the misfires.The work will start next week.
08-06-2008, 07:54 PM
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Originally Posted by jman,Aug 6 2008, 05:34 PM
Latest Update - Leakdown Test
So I had a Leakdown Test done on Cylinder 1 and there was air escaping from the Intake Valve's and possibly a small air leak on the Exhaust valve's. Also squirted some oil into the cylinders as part of test and the piston rings are okay.
So it is looking like new valve's for Cylinder 1 and a careful inspection throughout the replacement process for any other visual issues. For the moment I am going to stay away from any work on the injectors and by hopefully fixing the compression issue in Cylinder one it will in turn solve the misfires.
The work will start next week.
So I had a Leakdown Test done on Cylinder 1 and there was air escaping from the Intake Valve's and possibly a small air leak on the Exhaust valve's. Also squirted some oil into the cylinders as part of test and the piston rings are okay.
So it is looking like new valve's for Cylinder 1 and a careful inspection throughout the replacement process for any other visual issues. For the moment I am going to stay away from any work on the injectors and by hopefully
fixing the compression issue in Cylinder one it will in turn solve the misfires.The work will start next week.
09-13-2008, 07:00 PM
#27
Originally Posted by jman,Aug 2 2008, 05:44 AM
Thank you to all for feedback and advice.
I had a chance to chat with Hardtopguy (Jeff) during the week. Like many of us he has seen this scenario before and indicated it is actually two separate issues (compression and misfires).
My next steps for fix are:
- Replace injectors with working used ones
- Flush Fuel System
- Replace both intake and exhaust valve's on Cylinder 1
- While doing all this work keep a careful eye out for any damage in the cylinder head
I am waiting on parts and hope to have the work started in the next week.
I had a chance to chat with Hardtopguy (Jeff) during the week. Like many of us he has seen this scenario before and indicated it is actually two separate issues (compression and misfires).
My next steps for fix are:
- Replace injectors with working used ones
- Flush Fuel System
- Replace both intake and exhaust valve's on Cylinder 1
- While doing all this work keep a careful eye out for any damage in the cylinder head
I am waiting on parts and hope to have the work started in the next week.
Mark K.
03-13-2009, 11:26 AM
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Sorry for not following through on the outcome of my misfire situation. Thanks to Random1 for encouraging me to complete the story. 
So.....after all the "repairs" I tried on my own:
1) Replacing Spark Plugs
2) Replacing Fuel Injectors
3) Doing a Valve Adjustment
4) Endless compression and leakdown tests
5) Using a Boriscope to Check the cylinder walls and pistons (which were all fine)
I finally broke down and went to a Honda Specialist (non-dealer) and we worked to take the engine apart after the leakdown test showed air escaping from the Valve's in cylinder one. Note: the cylinder walls, pistons, and valve's looked to be in perfect condition. Nothing unusual.
So we replaced the valve's in cylinder one with new OEM ones and did the compression test. Same bad compression results in Cylinder 1 and upon reassembling the engine it threw the same old misfire codes.
So again the engine came apart and the valve's out. This time we closely inspected the valve seats/retainers for cylinder 1 and noticed they looked ever so slightly warped. So I call up Honda to check on new valve seats and discover that Honda makes oversize valve seats/retainers for the S2000. What is interesting is this is the only Honda vehicle that they make oversize seats/retainers for. Personally I think that is because this is a common problem and probably should have been a TSB.
Anyway, we went through the process of freezing the oversize valve seats and heating up the engine block and installing them. Put engine back together and compression is fixed........finally
After months and months and a total cost of parts/labor/etc at $2k.
These misfire codes seem to have alot of symptoms and solutions. For those that have done the S2ki research I don't think my situation is a fix-all or the "correct" solution. The key in my case was the compression and leakdown test which I recommend early on if anyone has these codes to see how serious it is. In some cases it could literally be the gas cap needing tightening to fix this.
Anyway I hope this helps and feel the pain for anyone who goes through this.
I am currently 8,500 miles and 6 months into my S2k running great again.
So.....after all the "repairs" I tried on my own:
1) Replacing Spark Plugs
2) Replacing Fuel Injectors
3) Doing a Valve Adjustment
4) Endless compression and leakdown tests
5) Using a Boriscope to Check the cylinder walls and pistons (which were all fine)
I finally broke down and went to a Honda Specialist (non-dealer) and we worked to take the engine apart after the leakdown test showed air escaping from the Valve's in cylinder one. Note: the cylinder walls, pistons, and valve's looked to be in perfect condition. Nothing unusual.
So we replaced the valve's in cylinder one with new OEM ones and did the compression test. Same bad compression results in Cylinder 1 and upon reassembling the engine it threw the same old misfire codes.
So again the engine came apart and the valve's out. This time we closely inspected the valve seats/retainers for cylinder 1 and noticed they looked ever so slightly warped. So I call up Honda to check on new valve seats and discover that Honda makes oversize valve seats/retainers for the S2000. What is interesting is this is the only Honda vehicle that they make oversize seats/retainers for. Personally I think that is because this is a common problem and probably should have been a TSB.
Anyway, we went through the process of freezing the oversize valve seats and heating up the engine block and installing them. Put engine back together and compression is fixed........finally
After months and months and a total cost of parts/labor/etc at $2k.
These misfire codes seem to have alot of symptoms and solutions. For those that have done the S2ki research I don't think my situation is a fix-all or the "correct" solution. The key in my case was the compression and leakdown test which I recommend early on if anyone has these codes to see how serious it is. In some cases it could literally be the gas cap needing tightening to fix this.
Anyway I hope this helps and feel the pain for anyone who goes through this.
I am currently 8,500 miles and 6 months into my S2k running great again.
