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Old 12-13-2011, 05:55 PM   #1
TheEugeneKam
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Hey i keep getting missfire in cylinder 3, and joulting when under WOT. The car seems to not want to accelerate in joulting movement. I tried using fule line cleaner with no luck and also swapped 1st and 3rd ignition coil, they are fine what to do next? I dont even know where to start. I see my boost is peaking at about 10 though, im running 93 map with 94 octane and the weather was + 8 with next to no humidity.
https://docs.google.com/spreadsheet/...XI1NGp5TlY1WEE
its a stage 1 with just a bov as a mod, rest is stock. This was the 3rd gear pull
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Old 12-14-2011, 02:03 AM   #2
snoopy8818
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I think I would go back to the stock BOV, your getting no boost at all. I am not expert but maybe that BOV is blowing off all your boost.
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Old 12-14-2011, 02:40 AM   #3
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Yeah im thinking that the spring cant handle the load, ill try to find the stock and see if that changes anything. Its always cylinder 3 though so thats my big concern. Just wondering if crappy fuel injector can cause a drop in boost. Or could i have a leak somewhere in the system?
EDIT: I looked over all the data again and as far as i can tell my A/f is fine, fine knock learning is okay, dam is okay, feedback is alright. I am not sure what the correct value is for the waste gate duty, but its seems pretty consistent so i think it should be okay. My boost on the other hand is terrible. About only 60% of what should be made. I will install the stock DV instead of this crappy ass BOV and see if that changes anything, I shall update.

Last edited by TheEugeneKam; 12-14-2011 at 03:52 AM.
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Old 12-14-2011, 10:26 AM   #4
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Quote:
Originally Posted by TheEugeneKam View Post
Hey i keep getting missfire in cylinder 3, and joulting when under WOT. The car seems to not want to accelerate in joulting movement. I tried using fule line cleaner with no luck and also swapped 1st and 3rd ignition coil, they are fine what to do next? I dont even know where to start. I see my boost is peaking at about 10 though, im running 93 map with 94 octane and the weather was + 8 with next to no humidity.
https://docs.google.com/spreadsheet/...XI1NGp5TlY1WEE
its a stage 1 with just a bov as a mod, rest is stock. This was the 3rd gear pull
I would put the stock BPV back on with a new gasket. How long has it been since you reflashed the map or reset the ECU since this log?

Generally, the initial steps for diagnosing an actual misfire would be:
1. swap coil packs of offending cylinder with another to see if it follows (you did this already).
2. Replace spark plugs.
3. swap injector of offending cylinder with another
4. compression/leakdown test

Bill
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Old 12-14-2011, 01:33 PM   #5
TheEugeneKam
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okay so i replaced the spark plugs also. if the stock DV doesent do the trick its injector swaping time
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Old 12-14-2011, 08:21 PM   #6
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UPDATE: Its injector swaping time stock under stock DV same stuff. At least i got around to taking off the crapy ebay BOV last guy had on it
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Old 12-20-2011, 07:38 PM   #7
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UPDATE: So i changed the fuel injector, same thing still going for a compression test tomorrow
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Old 12-21-2011, 01:24 AM   #8
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Sorry to hear, I drove my 2007 STI like there was no tomorrow and it lasted, good luck on the compression test.
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Old 12-21-2011, 01:57 PM   #9
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well my compression was low 138, just at the bare minimum. So i will need to rebuild headers eventually. The misfire was due to something really stupid... the spark plug. We figured it was flooded when i sea foamed the car a while back. So that's solved, no more misfire issues, but the compression worries me.

https://docs.google.com/spreadsheet/...kpFd2U5X0FSbmc
Tempreture was +4C and it was raining a tiny bit.

Here is the new table, my boost is still low for a 94 map, with 94 octane, could that be due to low pressure? I know the compression should be about ideal 140-170 on this engine. Does not sound like im leaking boost, no whistle or anything.
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Old 12-21-2011, 04:49 PM   #10
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Well your DAM did not learn back up yet to 1. It's only 0.81 I don't know if that will bring the boost up through when it learns itself back to 1.0
What was the pressure across all four cylinders?
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Old 12-21-2011, 06:47 PM   #11
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we just tested the 3 cylinder that was misfiring for now as that was the imidiate issue, my shop is busy as hell and he didnt charge me anythign . Im gonna check the pressure across all a little later to narrow down if its exahaust vale, head or the whole frigging thing.

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Originally Posted by snoopy8818 View Post
Well your DAM did not learn back up yet to 1. It's only 0.81 I don't know if that will bring the boost up through when it learns itself back to 1.0
What was the pressure across all four cylinders?
Thats a good point, i didnt notice that. I will need to give it some time to learn, maybe the boost will come back up main this is the misfire stopped, i can deal with lowered power for now.
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Old 12-21-2011, 06:48 PM   #12
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double post
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Old 12-21-2011, 07:14 PM   #13
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I was trying to look for a log from my 07 STI and I beat on that car
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Old 12-21-2011, 11:38 PM   #14
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Im going to run some more test on boost tomorrow. My DAM is at 1 now, so i will see if the boost will increase with this. Also curious if DAM <1 could effect the outcome of compression test.
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Old 12-22-2011, 12:21 AM   #15
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The dam would not have effected the compression test, I know that much, I actually tried looking all over for the logs from my 07 STI but I could not find them. Sorry
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Old 12-22-2011, 01:12 PM   #16
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no worries, thanks
Look like I will need to have an engine build soon
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