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Discussion Starter · #1 ·
So I have a 2012 Si 175k on the clock and I’ve been chasing down a misfire for like a year (30k miles) now and kind of don’t where to go next so hoping someone can point me in the right direction.

So this issue happens randomly sometimes it takes 500miles & sometimes it’s 5000miles in between incidents and it happens more frequently in the cold, but when I start driving, always in my first two minutes of driving car & only after the car has sat all night, I get a flashing check engine light full misfiring and everything basically can’t drive it. I shut the car off for 10 seconds start it back up and it’s fine. I’ll drive anywhere from 500 - 5000miles and it happens again. The only code that ever pops is misfire code P0302 - Cylinder #2.
I’ve replaced plugs/coils/injectors the misfire doesn’t change cylinders. Compression on the engine is good, what should be my next step from here? I’m thinking it’s maybe some electrical? Anyone have any suggestions for me? Let me know if you need anymore info.
 

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Have you done a leak down test? As well check valve lash and what were the compression numbers.
Car stock as well?
 

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Discussion Starter · #3 ·
Have you done a leak down test? As well check valve lash and what were the compression numbers.
Car stock as well?
I don’t recall the compression #s off the top of my head, my dad did the test with a tech buddy of his I’ll see if I can find em, but they were well within norm. No leakdown test performed or vavle lash checked. What are these and would I be able to perform them myself? Car is 10 years old and has close to 200k on it so would prefer to not have to shell out diag money if avoidable.

Car is 100% stock expect for a fx100 Clutchmaster kit (none lightweight). In the cold it happens like every 500 miles where in the summer it typically happens once or twice between oil changes.
 

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As intermittent as the problem is, I would not waste my money on a dealer doing diag. Especially since you say a key cycle turns off the light and returns car to normal function. The dealer will take your money and tell you they can't find anything wrong "at this time."

Also that bulletin was for all '12 Civic EXCEPT Si.
However, having the dealer perform the learn procedure would not hurt... except for your wallet.

I went to the P0302 troubleshooting to see how involved it is... very involved.
But on step 5 I found this:

NOTE: If the misfire can not be reproduced, there is a possibility that the problem may have been caused by poor quality fuel. The problem may have disappeared after refueling with fresh fuel. The MIL DIST (MIL Distance) value in the Data List in combination with the fuel level may help you make this determination.

In addition; adjusting the valves is easy, even I managed to adjust the valves on my '12 EX...

Hope this helps you out.

P.S. Please include city and state in your profile.
 

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Discussion Starter · #9 ·
As intermittent as the problem is, I would not waste my money on a dealer doing diag. Especially since you say a key cycle turns off the light and returns car to normal function. The dealer will take your money and tell you they can't find anything wrong "at this time."

Also that bulletin was for all '12 Civic EXCEPT Si.
However, having the dealer perform the learn procedure would not hurt... except for your wallet.

I went to the P0302 troubleshooting to see how involved it is... very involved.
But on step 5 I found this:

NOTE: If the misfire can not be reproduced, there is a possibility that the problem may have been caused by poor quality fuel. The problem may have disappeared after refueling with fresh fuel. The MIL DIST (MIL Distance) value in the Data List in combination with the fuel level may help you make this determination.

In addition; adjusting the valves is easy, even I managed to adjust the valves on my '12 EX...

Hope this helps you out.

P.S. Please include city and state in your profile.
just to provide some clarity the check engine cone P0302 is always there. I’ll clear the code and it’s comes back after a few days of driving. It’s the major check engine light flashing car falling on its face that happena randomly.

I don’t see how it could be a fuel issue in terms of quality as it’s been happening for 30k miles and I have changed up station for several weeks at a time to consider this option. It’s a super strange issue.

If it is a valve adjustment that is needed, would it be happening inconstantly like this? I would imagine it would be more frequent as a valve issue. Unfortunately it’s cold so either way I’ll probably have to have Honda do it.

appreciate the insite/recommendations.
 

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Does the DTC come back after a particular driving pattern?

Not a Honda but this video might provide you with further insight. If you live near this guy, that's where I would go for repair...

If you have 44 minutes to watch the whole video. I think you will find it enlightening.
Or
Jump to 16 minute mark when he discovers how to duplicate the problem.
 

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Discussion Starter · #11 ·
Does the DTC come back after a particular driving pattern?

Not a Honda but this video might provide you with further insight. If you live near this guy, that's where I would go for repair...

If you have 44 minutes to watch the whole video. I think you will find it enlightening.
Or
Jump to 16 minute mark when he discovers how to duplicate the problem.
I will definitely have to watch the full video, but fast forward to the 16minute mark and seeing him duplicate, mine does not duplicate like that.
If I clear out the basic code it does always come back, sometimes after 50miles sometimes after 500miles. The super heavy misfire flashing check whole car stuttering is even more intermittent. Sometimes it’s doesn’t happen for 5000miles at a time & I’ve never been able to duplicate the misfireat idle. Also he does seem to have multiple codes and mine is always for cylinder #2 and it’s just P0302
I daily drive the car and I do put a lot of mileage on it and I have not been able to duplicate in anyway, it seems super random.
 

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At this point the best advice I have for you, is to make sure a DTC P0302 is stored before taking the car to the dealer.
And better, take it in after the severe misfire event has occurred.
 

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Discussion Starter · #13 ·
At this point the best advice I have for you, is to make sure a DTC P0302 is stored before taking the car to the dealer.
And better, take it in after the severe misfire event has occurred.
Yeah the code is active right now I don’t plan on resetting it. I’m trying to get an apt for next Thursday as I’ll have another car to use for work that day.
Much appreciate the advise/insite. My father and I have been playing with this for a bit now and it has to be either something electrical/computer related or the need for a valve adjustment but imo it would be more consistent if it was related to the valves. All the basic stuff plugs/coils/fuel injectors/fuel/etc has been eliminated & if it was a major internal engine failure of some kind it’s super unlikely the car would run with the issue persistantly for 30k without the engine saying good bye completely and the car runs 100% when it’s not happening, fluids & everything are normal.

Will definitely update after my Honda visit
 
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