The real carnage is what the piston looks like when it comes out. I noticed that a good part of the side was also chunked as well.

 

The piston ring collides and takes a chunk of the piston with it? So what exactly are we supposed to do? Mitsubishi doesn't care and shops want money. I don't see why I should pay to fix something I didn't break. I have 22k miles on my X though and I don't think this has happened yet.

How common is this and if it happens how obvious is the problem? What I mean by that is what are the chances that the driver might not know that he is driving on a shaved piston and a few turbo blades missing?

The only solution I see is a mob of people with pitch forks and torches heading over to Mitsu.

 

Mitsu will fix as long as no mods present. There have been quite a few of cases and Mitsu has come through in most of the ones that were brought in to the dealer.

Its a pretty intermittent problem. You will know if it happens as your car will be running on 3 cylinders essentially (feel a bit like limp mode but its not). You will also hear metal bouncing around in your engine. Then eventually that metal will make its way through the turbo damaging the fins on the way out. The #4 spark plug is the first to go and the ground strap usually is crushed, hence the cylinder goes out.

I am driving on chunked out pistons and damaged turbo fins. My turbo makes an abnormal whistling sound otherwise it just uses a bit of oil and fouls up my plugs every 1k or so. Next time a plug goes out again, which should be soon based on my historical data, the head comes off and they get to see the carnage which will lead to an actual solution to this problem on my X.

 

Are you stock? I would have loved to be stock but that damn tune they gave was unbearable to drive with.

 

Ok I'm confused

You have had a bore scope in the cylinders twice, which both revealed nothing. Car passes comp and leakdown? Surely this is the first thing the dealer does in a scenario like this whether they tell you the results or not, so I assume they have done it. You are driving the car every day with with a slight misfire and it fouls a plug every couple thousand miles....yet you think that the piston is chunked on 2 cylinders and it is still running? Seriously guys...take this internet **** with a grain of salt. I could see a small piece of a ring breaking and spitting it out and still running...but "chunking pistons" common. It appears to be a problem, but don't assume that because you are having some problems that you broke pistons.

Do a comp and leakdown yourself, or take it to AMS and have them do it and lets see the results.

 

... a piece of the ring get spit out without taking a piece of a piston with it?

 

First borescope revealed nothing. Second was by the dealer and they said it revealed nothing except #4 cylinder being loaded with carbon, which they "cleaned out". They said they don't expect the spark plugs to be a problem again and that the next step would be to pull the head.

Whether it be a chunk of piston or a piece of the rings... still a big problem. I am providing my experience here. An experience that every step of the way has been laid out by TTP chronologically. My turbo whistles due to the pieces of piston or rings exiting through its fins.

I have a compression tester. I will get around to it this weekend. If so I will post results.

 

So I have had this same problem seems pretty early only been happening for a month but i found out today after reading this thread my fuel pump relay is bad when I did a relay swap test. 2 weeks ago after a week of stuttering at cruise they replaced my spark plug #4.

Yesterday it all began again. I talked to Mitsubishi I still have warrenty but they want to blame tbe withou tune although this didn't begin until a month or so ago. I have had exhaust for a year. I am putting stock exhaust on and taking it in. I have printed off this thread am bringing up he bad relay that sounds like a salt shaker and hopefully there isn't much damage.

Sorry about bad grammer I'm writing this on iPhone.

 

Just ran across my AMS Tune. I was wrong about the Rev Limit being set @ 8k. It was actually set @ 7700. Just thought I would mention that.

 

Well with information of other relay's going bad including injector relay's, how possible is it that just one cylinder is running richer or leaner than others? This could be why you're fouling out just one plug. Do you have a wideband?

 

If I'm missing something you are implying, I apologize. This statement does come across as though you may not have read this thread in its entirety though.

 

Re-read my statement then. I read the thread and am aware of what's going on.

I'm simply stating that as of recent, new TSB's have come out in regards to other relay's going out, which includes an injector relay and others.


EDIT:

Here is my 2 cents. Since the dealer has seen the car already and is stating nothing is wrong, I would drive the **** out of the car until she blows, tow it to the dealer, and let them explain how nothing was wrong.

 

Tis the plan that is already in motion It has started to be stubborn at starting every now and again lately so that is a sign that the plugs are likely getting fouled up again.

 

Great thread. I don't even have an X but I'm waiting for the next installment.

 

Yes! I had this happen with a Brisk plug, ran fine but as soon as boost went above 15 psi it would misfire