A couple of weeks ago I blew out both head gaskets on my turbocharged LS1.
Both heads were junk as well.

I thought the reason was because I had used 3.910" head gaskets and not the 6.0l gasket. It seemed to me that the 5.7l gasked would create an edge and a hotspot inside the combustion chamber.

So I bought a set og 4.05" gaskets and a set of Patriot LQ9 72cc heads.
Bolted everything back up and the damn thing would not idle and my WB was reading like 19:1 or something.
Spent two days troubleshooting just about everything before I finally checked the injectors - I have a injector tester/cleaner in my shop.

Two of the injectors were totally dead...I have tried flushing, ultrasonic cleaning, but no. They both still measure 12.5 ohms like the others.

Any ideas what might cause this? These were brand new 75lb Lucas injectors with only 2hrs runtime on them.

Seems like the injectors died under full boost and took out my engine so I am REALLY interested in how to avoid this in the future.

My alternator (also brand new Deplhi unit) is also toast - can a voltage spike have caused this?

 

Did you hook up an oscilloscope to see the coil operation ? That would tell you definetly.

Did you drop the injectors ? They're more fragile then people seem to think...

 

No, I do not have an oscilloscope and they have not been dropped after I received them brand new from one of the sponsors on this board.

I do have an injector testing machine and they do not pulse.......come to think of the fact that I have not tried run just these two alone in the machine, that way I can at least hear if the coils are pulsing.

I have already ordered new injectors, but I rather not have this happen again so that is why I am trying to figure out what might cause this.

 

Tried to fire the two injectors alone in the tester.....they are 100% dead.

 

That sucks man!!

 

Yep, it really sucks bigtime....

Got my new injectors today and ran them through the tester before installing them - engine purrs like a kitten again (or maybe a tiger...)

Nobody that have any idea why this have happened?

 

Maybe broken parts inside? I know it can happen. OR maybe some type of contamination jammed the pintle. I know rust is a problem in the fuel systems in these cars.

 

Well I do run straight E85 on this vehicle and I have noticed that it produces a lot of moisture everywhere - but enough rust to make it stick after only two races - is that possible?

Fuel system is set up like this:
- Aluminum fuel cell with dual AN10 outlets
- Dual Aeromotive A1000's merged into single AN10 after the pumps
- AN10 feed line split into two AN8 over the intake
- Aftermarket fuel rails
- Aeromotive pro series regulator with AN10 return line