I find this very concerning considering the mileage. I assume that the repair service verify through diagnostics that this was a head gasket but I would also be curious about how it happened. The OP mentioned the low coolant light coming on but do we know if the engine overheated. Was the bad hose the initial. problem. Did the water pump blow. Somehow I see this as a loss of coolant followed by an over heated engine causing a blown head gasket.

 

This was the first time I ever purchased one, and I was beyond glad I did once everything was said and done at the mechanic shop.

 

From what the shop told me, there were 2 injectors misfiring which caused the head gasket to start leaking around those 2 cylinders initially. I think they just found the rest as they disassembled everything. So just to clarify for anyone interested these were the parts that were replaced:
2 - Head Gaskets (because replacing just one would have had me paranoid)
2 - Fuel Injectors (which caused the issue initially)
1 - Supercharger Rebuild (they said it was making abnormal noise at idle)
1 - Heater Hose
2 - O2 Sensors
Ive put about 3k miles on the car since all the work was done, and haven't had any further issues since.

 

OK you got me there as I've never heard of a faulty FI cause a head gasket to blow. Hopefully others that know can explain how this happens. As to the SC what was the cause of the noise. I would have thought you would have had MIL codes set from the injector issue. All seems a little concerning considering you only have 37K miles on the car. By the way was this done by a dealer . Also did you ask to get the old parts back before they started work. This usually puts them on guard regarding what parts they start changing out. The old "trust but verify" question. Glad it's fixed.

 

They said that the injectors misfiring caused those 2 cylinders to heat up more than the rest, which in return caused the head gasket to fail in that area. As far as the supercharger goes, I cant really say what caused the noise issue, given I did hear it slightly which sounded to me like the snout coupler going bad. Which is a common issue from what I've read. I didn't ask for any old parts back, and I also told them to fix anything in question while it was apart. This was a place called Import Performance that did all the work, not the dealership. Owner was super nice and was able to get everything covered by the warranty company.

 

Old saying, "Run em lean, things get mean". Especially under boost.

 

Not a problem there ranch as I suspect if you had a plugged or non-functioning FI you would be getting check engine and performance light all over the dash. And I would ASSUME with 2 injectors bad the engine would run for crap and be shaking . So that being the case how long would you have to be running before you blow the HG. I would believe you would have to shut down the car ASAP . Even though I would believe it would run a little bit before it blows.

 

I dunno, I'm not a mechanic I'm just saying what I was told. I do know that no engine lights were thrown prior to the restricted performance code. Once that happened there were like 7 different codes being thrown then. They did say that they had the car completely back together before they found the 2 faulty injectors due to check engine light coming back on again. They then replaced the 2 injectors and the 2 o2 sensors. No issues since ive had the car back, aside from the check engine light will come on sometimes but it doesn't stay on and it doesn't effect the way the car runs either. I plan on getting it checked I just haven't yet at this point.

 

The reason I am looking for as much info about this event is because it is unusual and not normal. Even aluminum heads and block can take a high degree or various engine temps without head gasket failures. Same with premature fuel injector failures. Without the old parts all we can do is speculate so there is no real cause determined. So I guess we can chalk this up to an anomaly and move on. I have had very little work done on my cars by either dealers or independents. If I do I always make sure they give me the old parts so I can see what was the cause. I guess just part of my engineering background. So good you had coverage . Enjoy the ride.

 

You need to look at this from several different perspectives. The ECU uses feedback from the o2's to determine how much injector timing (fuel trim) to to give the injectors base pulse to get the desired o2 reading. It uses the mass air readings and map as well as RPM and throttle position to decide how to fuel the engine. There's a lot going on so how much different stuff was close to being out of tolerance without throwing codes until it torched the gasket. In my experience usually a head gasket will go from detonation which can happen before you hear it. I used to have a bunch of 302 head gaskets with the exhaust side ovaled out from getting greedy with my boost timing master. Cross chamber leak / burn threw is sketchy. I'd prefer to know why and at least know that the shop actually measured both the head and block for straightness before just tossing a gasket in there. Doesn't help with the underlying cause but I'm not sure we'll ever know unless it happens again.

 

The supercharger on my '2010 XKR will hopefully be rebuilt in the next week or two because it has the same issue and it has only done 17,000 miles.

 

Both heads were removed and sent to a machine shop in Crystal Springs, FL to be tore down and everything checked to ensure there were no issues with them. They didn't just pull the heads off, put gaskets on, and throw it back together real quick like lol. Ill see if I can get all the pictures they took during the whole process sent to me, if anyone would like to see.

 

Yes, pictures are needed.