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Old 12-01-2013, 11:45 PM   #1
Wrxstage2yukon
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Default SOLVED misfire!!!

Hey guys, recently I've joined this fourm to try and learn more and diagnose my issue on my bugeye. I have to say there was a lot of info that helped me on the way and some learning experiences for sure.

I did a new block, heads and turbo all oem, nothing fancy at all. After a few hundred km i delveolped a cylinder 1 misfire.
So I started the diagnose, the list is long and a available on line here. I did each thing with the given instructions. Eventually we isolated the misfire, which started to intermettinly add cylinder 2,3,4 along with the misfire code. Cylinder 1 showed a 15% ( warm) and 20% ( cold ) leak coming from the intake, you could actually hear it. So obviously intake side valve wasn't closing all the way and would misfire ONLY on idle. Anything over 1200 rpm was great.
So I pulled the motor today and when I took the heads off I made sure my cams were flat on the bucket with all valves been closed. Shined a flashlight into the exhaust and intake side and found light shining through the valves.

So with that said problem found by intake valves staying open.
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Old 12-01-2013, 11:48 PM   #2
Wills03rexwagon
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Good ***** man
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Old 12-02-2013, 12:04 AM   #3
Wrxstage2yukon
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? Sorry I don't understand what you ment.
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Old 12-02-2013, 12:55 AM   #4
Wills03rexwagon
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I'm glad u figured out the problem, now u can execute the fix
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Old 12-02-2013, 01:03 AM   #5
Wrxstage2yukon
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Absolutely, I wanted to post this because not many misfire threads have a solve at the end. If someone experiences a misfire at idle this is a possibility for them.
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Old 12-02-2013, 01:54 AM   #6
Wills03rexwagon
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Indeed
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Old 12-02-2013, 08:24 AM   #7
quazimoto
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Who built the motor? Or did you buy a factory long block?
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Old 12-02-2013, 08:36 AM   #8
BuckwildWRX
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So the timing was off just a hair or the valves didn't seat all the way.
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Old 12-02-2013, 06:55 PM   #9
Wrxstage2yukon
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Factory long block.
Timing was checked by two different shops and it was bang on.
Brought the heads to rebuild shop ( 40 yrs exp ) and poured water in the intake side and sure enough leaked out. Also the gap from cam to bucket they said is suppose to be .0014" and can't get a feeler gauge over .0010" in there. So there out plus valves aren't seating all the way, not by much I'll add, but 12 out of 16 valves did show SOME light through and water.

Last edited by Wrxstage2yukon; 12-02-2013 at 07:55 PM.
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Old 12-03-2013, 10:15 AM   #10
shamrock 05
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You bought a oem factory long block for $5200 ish and had problems with it....WTF
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Old 12-03-2013, 03:41 PM   #11
Wrxstage2yukon
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Ya.....
Not that much lol

Last edited by Wrxstage2yukon; 12-03-2013 at 10:58 PM.
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Old 12-03-2013, 11:47 PM   #12
Saabaru300
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Well... :/
Thank you for posting your results on your misfire problem. I have a misfire at idle problem too. Cleaned the maf, swapped the coils between cylinders 1 & 3 with the code not following, still need to move the injectors around and see if the code follows that. Just got my motor a month ago and have had this idle misfire the whole time. Cylinder 1 code has always piped up, had all 4 at one point. Don't know if I should be really worried about my misfire but I hope it isn't my cams. Had a lean condition code also.
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Old 12-04-2013, 12:28 AM   #13
murrdogg24
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i also had a 02 wrx with misfires and upon taking the engine apart we found a burnt valve
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Old 12-04-2013, 06:17 AM   #14
shamrock 05
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Quote:
Originally Posted by Wrxstage2yukon View Post
Ya.....
Not that much lol
pm me where you found it cheaper
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Old 12-04-2013, 07:40 AM   #15
quazimoto
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Quote:
Originally Posted by Wrxstage2yukon View Post
Factory long block.
Timing was checked by two different shops and it was bang on.
Brought the heads to rebuild shop ( 40 yrs exp ) and poured water in the intake side and sure enough leaked out. Also the gap from cam to bucket they said is suppose to be .0014" and can't get a feeler gauge over .0010" in there. So there out plus valves aren't seating all the way, not by much I'll add, but 12 out of 16 valves did show SOME light through and water.
You can try and just re-lap the valves and see what happens. Pretty easy and cheap to do by hand.
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Old 12-05-2013, 09:38 AM   #16
Wrxstage2yukon
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Sorry could you explain the term relap the valves? New to heads
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Old 12-05-2013, 10:06 AM   #17
ShinjiML
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I think he means re-lash the valves.
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Old 12-05-2013, 01:09 PM   #18
Wrxstage2yukon
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Yah there been completely re done, cutting the valves to fit, new buckets if needed,
Guides all that.
Should have all parts by tomorrow than I'll put the engine back in this weekend
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Old 12-05-2013, 01:17 PM   #19
Wrxstage2yukon
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Saabuaru300---- that sucks man, sounds like you have the exact symptoms I did. Try swapping stuff around but if it ran fine when you dropped it off and idles bad after you picked it up chances are they made a mistake somewhere. I'm not really sure what your story is, check for vacume leaks.
If no luck swapping parts than bust out a conpression/ leak down test and isolate it. No matter what you'll hear a little noise coming from the oil cap coming from
Crank case. Some Noise is totally normal. If all that checks out look at your valve clearances
( this can be done with the engine still in the car.

To the best of my knowledge clearances are
Intake .020 mm
Exhaust .025 mm
Allowance +/- .02

And if your not metric I think it's .0014"
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