One Spark Plug Melted, Rest Are Fine...

[camoo]

ok so mods as follows.

standard 25 neo

bosch 044

725 injectors

Z32 AFM

return flow FIMC

turbo back exhaust

GT3076

Nistune.

265 rwkw, 11.8 AFR, 16 PS

...................................................

so last week added splitfires, and changed my spark plugs from bcpr6es to bcpr7es.

Got a retune a few days later.

went on a cruise last night in the pouring rain, and after some mild driving for a few hours , my car started to violently miss fire across the rev range under boost and so i went home.

Next day i pull the plugs to find all fine, a little rich looking, but number six earth point is melted...

Put the old plugs back in, go for a run, still missfiring.

Check plugs again and there all fine.

Check AFM ( which is in the cooler pipes), to find a large amount of moisture inside the pipes.

After investigating, considering the down poor last night, im fairly confident the water was sucked in my intake.

Im letting the cooler and pipes dry out over night so i havent driven the car.

Im not to worried about the water, but the single melted plug as me scared shitless....

Im stumped as to what it could be...

HELP!!!

[Bsa]

dam haven seen that in a while how long since injectors where put in?

[Hanaldo]

One cylinder running lean?

[markdem]

injector would be a pretty obvious thing to check

[JonnoHR31]

time to flow test no.6 injector

[Hanaldo]

Damn phone, pushed post too early.

Meant to say I'd be getting the injectors flow tested.

[camoo]

injectors are only a few months old... wouldnt think they would give out so soon

[Bsa]

maybe shit fuel. how long since you changed your fuel filter? how low do you run your tanks?

[camoo]

changed the filter around 4000ks ago, i did run my fuel right down last week though right to empty

thanks for the swift reply's everyone. much appreciated

[HYPED6]

Injectors for sure.

We flow test every single injector from new. A lot have to be at least cleaned, some returned to the supplier.

These are brand new straight out of the box injectors. Its the most logical place to start looking.

[zebra]

detonation will kill plugs

so as others have said check the squirter, but I personally would be looking further (ring lands etc)

[camoo]

sounds like a plan then.

pretty shit considering i was planing on driving home to Sydney from Adelaide on Wednesday...

there goes that plan lol.

ill pull the injectors and have them cleaned...

What about your store bought injector cleaner?

ive got some liqui moly injector cleaner laying around...

worth a shot or not?

[Bsa]

do a comp test on it and get your injectors clean. should aleays try and fill up at a quater if you ever get to see the bottom of a fuel tank you would never drop it low again. you need to get them cleaned properly your motor is worth it

Edited December 18, 2011 by Bsa

[camoo]

comp test and injector clean it is...

[GTR_JOEY]

Very odd that it was running fine before the tune, 6 cylinder tends to run alot warmer then the rest of the cylinders so generally the tuner will/should add a little more fuel to it to keep it cool... If this hasn't happened then the cylinder runs lean and can cause detonation/ even pre ignition in extreme cases.. Also a melted spark plug may occur.

Clean the injectors, though I wouldn't be putting my eggs in that basket.. Defiantly compression test, you may have mashed ring lands or even a hole burnt in the top of the piston..

Let's hope not anyway...

Ps don't buy that injector clean stuff, pull them out and get it done properly

Edited December 18, 2011 by GTR_JOEY

[JonnoHR31]

What about your store bought injector cleaner?

ive got some liqui moly injector cleaner laying around...

Ps don't buy that injector clean stuff, pull them out and get it done properly

this, dont use the snake oil, get them properly cleaned if you pull them out.

[Guilt-Toy]

you might have a hole in the piston. that cyl was running in a bad state.

[r33_racer]

I would probably put a new fuel filter in it too if you ran the tank right down to nothing.

[camoo]

ok i cant see how, but is it possible the water in the system contributed to the melting of the plug?

[luke gtr]

the only way i can think of the water contributing, is if , by pure chance, water got into that cylinder, hydraulic locked it slightly, bent the electrode to touch, and it melted from there.

would be a 1 in a 1,000,000,000,000,000,000 type of thing.

owuld be checking advice above, and progress from there.

good luck.