Hi,

I am new to the forum and was directed here by a friend to see if I can get help figuring out my fuel issue. I have a 2.4LR motor on my evo 8 and recently just melted the pistons. After removing the head, the shop that my car is at found that the pistons were melted (#4 being the worst).

Apparently there was a detonation issue which caused this to happen. I was doing a pull front 2nd to 3rd and then to 4th when all of the sudden a cloud of white smoke shot out the exhaust and continued to smoke as i pulled over. The oil catch can was smoking bad so I looked in there and saw some oil and tried to drain it but nothing came out.

The head has a couple of marks which seem like that can easily be machined. The shop has not had a chance to fully disassemble the motor but they think the rods will be ok. All the pistons had oil on them as well. The spark plugs were not damaged but #4 did have oil on it. The odd part is that a similar thing happened on my last motor which was a 2.3 stroker but that time I had alcohol injectiom as well and thought it caused it so I removed the kit before this motor. Both times it was #4.

Right now, the plan is to have my FIC 1350 injectors checked out, make sure both pumps are working on my buschur double pumper, and maybe get the aem ems checked out to make sure the drivers are performing properly (was told on older aem boxes the drivers can go bad after time and not perfom as good, not sure if this is true?). My fuel system set up basically consists of FIC 1350 injectors, buschur fuel rail, oem fpr, oem fuel lines, and buschur double pumper. I would appreciate any helpful info in figuring out what issue my fuel system is having so this does not happen again after I replace the pistons. Thank You

 

Are you running E85? How often is the car driven? Do you have an AFR gauge?

 

im running 91oct. car is driven few miles everyday and more on weekends. As for gauges, I have the aem serial gauge, egt, and oil pressure. car was tuned by a reputable tuner and last time it was a different tuner, which is why i dont think its the tune, but i am going to have it checked as well.

 

any suggestions on what else i can look into or what could be possibly causing this?

 

If you blew up 2 engines in the same way it's most likely the tune.

 

i am going to have the tune checked out, but only reason i didnt jump on that is because the car was tuned by two different people. ive heard that FIC injectors sometimes have issues as well. a local shop tuned a car on FIC injectors and car ran fine first couple of pulls then starting having issues, so they swapped to another set and it did the same thing. finally they swapped them to a set of RC injectors and car no longer had any issues and ran perfect.

 

bump for advice

 

Too many variables to e-troubleshoot over the web... without a datalog of the pull when the engine died it is all shotgun troubleshooting...