I'm running a Steeda CAI and the FSWerks stealth exhaust. I noticed a tapping in the valve train as soon as I installed the Steeda CAI at low Rpm high torque loads. Went and did an auto cross day at a local track and got six runs in before my engine started rapping like a diesel. Made it half wat home and it died. I checked the oil and she was bone dry. The dealer tore it apart and found that it melted part of the drivers side piston. Their best guess is that the injector hung up and dumped fuel into the cylinder. It bent all 4 valves. Ford is covering it under warranty and I am getting a whole new long block.
Blown engine at 35000 miles
hixsonaf
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3,049 Posts
IMO, this guess could explain the tapping and bent valves. It would not explain a "burned" piston though, if that was truly the case.
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8,298 Posts
I told my expierience because the person I quoted seemed sceptical about an engine burning so much oil. They never showed me my broken piston and I was told different things by different people with no conclusive explanation for cause
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3,049 Posts
See below (bold emphasis added by me):
OK, I understand that you don't truly know what happened. But, you are willing to state in one place that the bottom of the piston was broken, and yet in another you tell us a hole was melted through your piston. Were you not trying to relate your case to the OP's when you stated that a hole was burned through your piston?
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33,660 Posts
Will you please show me where is said to never check your oil or that is was not worth doing
dogma ? Factual would of been a better word
low oil wouldnt cause a burned piston but a burned piston can cause low oil
The 2012up Focus runs lean , add mods and in most cases it gets leaner , this is what burns the pistons
Tom
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2,891 Posts
I think we can all agree to disagree. I am just glad the OP is getting his car fixed.
I believe this dead horse has been beat to a pulp...
I believe this dead horse has been beat to a pulp...
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1,180 Posts
I thought that is what PCM's and O2 sensors were for to maintain a 14.7:1 fuel ratio darn how lean is my 2012 when I add the 2013 ST turbo but with lower boost due to 12:1 compression I don't see aftermarket CAI or exhaust leaning a motor enough to burn a piston. For the concern about engine ticking think of how this engine is designed and works now how a modern diesel works this is just a low compression diesel with spark plugs and gives great mileage so I can live with tick, tick, tick.... LOL
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74 Posts
Sounds like running premium fuel would be a good idea for this engine. I think you get slight hp gains (2 hp) as well, but the oil rich premium would prevent the engine from running too lean. At least that's how I understand it.
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235 Posts
yes no kidding the dealers here are loving to document and try and decline warranty with mods like cold air even with cat back...glad it worked out for you
Free if you would of kept it like I did.
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1,180 Posts
You have to buy the whole box top and bottom around 138.xx but the ST you can buy the top and bottom separate around 25.xx each only difference I can see is the ST doesn't have the sound resonator on the bottom where you cut for the mod. And if they say anything about that being the wrong bottom not having the other piece. Well it came off your lot that way just say maybe they ran out of the other one my 2013 SE looks like the ST one no hole in the bottom I did notice it sounded better then the 2012 SE and a little more power.
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