strengthrehab
Well-Known Member
- Thread starter
- #31
There's the problem.
Valve spring broke.
Valve spring broke.
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Short term fuel trims?
- Thread starter strengthrehab
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Jay-rod427
Well-Known Member
Good deal. easyish fix. Must've not liked the revs at some point.
gqneon
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- Jun 25, 2015
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- Westfield, IN
- Vehicle(s)
- 18 GT PP / Manual
Sorry man - that sucks. Hope thats all there is to it. Is that bore scope where the piston contacted the plug tip? Scratching my head how that happened ...
strengthrehab
Well-Known Member
- Thread starter
- #34
8 piston (with plug) is perfect. Wouldn't be surprised if part of the spring went back into intake and then to #8 and bent the electrode.
strengthrehab
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- Thread starter
- #35
contemplated tearing this head off myself, but I have farmed the work out. I'd rather not pay for it, but I'd also rather have a running engine after, lol. I'll probably add headers while it is down.
Based on my compression tests, shortblock should be ok.
Based on my compression tests, shortblock should be ok.
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strengthrehab
Well-Known Member
- Thread starter
- #37
No clue with a broken valve spring AND a different spark plug with a completely closed electrode gap. I was down 2 cylinders and no codes.
strengthrehab
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- Thread starter
- #39
It definitely made me wonder for sure. I'm not sure if the tune has anything to do with it. Shouldn't but IDK.
Jay-rod427
Well-Known Member
Misfire code like any others has to meet certain circumstances before the dtc will set. Must not have ever met those.
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strengthrehab
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- Thread starter
- #41
Just weird how I drove an hour parked then drove another hour with it broken (I think since breakage wasnt confirmed until after getting home but it ran just as bad once home as it did as I exited the track and pulled into the paddock).
I did see the upper limit for misfires is like 65 thousand.
I did see the upper limit for misfires is like 65 thousand.
strengthrehab
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- Thread starter
- #43
Exactly.
strengthrehab
Well-Known Member
- Thread starter
- #44
Got word that my engine issue wasnt as bad as possible and I kinda lucked out.
When the valve spring broke, the valve was apparently held tight by the retainer and didnt actually drop far enough to kiss a piston.
Now I just have to have a machine shop check out the valve to ensure it is straight, check the guide and install factory (gen2 and boss 302 spec) springs.
Darker holes are #8 (bent electrode) and other is #6 (broken valve spring)
When the valve spring broke, the valve was apparently held tight by the retainer and didnt actually drop far enough to kiss a piston.
Now I just have to have a machine shop check out the valve to ensure it is straight, check the guide and install factory (gen2 and boss 302 spec) springs.
Darker holes are #8 (bent electrode) and other is #6 (broken valve spring)
strengthrehab
Well-Known Member
- Thread starter
- #45
Here is video evidence of the damage
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