My Pistons Melted

[whenmunkysfly]

i'm going to replace the fuel pump, inj, i have a lexus afm. which wasn't in the car when i drove it. i had the timing at 10 degrees. the guy at napa said it was detonation. i was most likely running too lean and there the pistons went.

...wait a minute. maybe the lexus afm was in there. i put it in to test it out, make sure it works. i swore i took it out though right after cause i knew it wasn't a good idea to keep it in without the 550cc inj and AFPR. i'm not sure now... it might still be in there. i thought i put it in the glove box. i'm gonna have to chek now. that was 2 months ago. i don't remember. i'm gonna be so pissed if it's still in there. i know i put the stock one back in...

this would explain. I feel your pain on the kit a bunch of paper and aluminum for $500 when you get your kit make sure you do get EVERYTHING. when i got it they left out little things like oil pan gasket, oil filter mount gasket,ect. just little stuff. lucky I had a freshly rebulid engine to steal the oil filter gasket off of. anyway just make sure you got it all. there is alot of gaskets there and they don't always remember to put them all in there.

edit: btw where did you have the timing at before you ajusted it?

 

[xarewhyayen]

well, the car shouldnt just decide to run lean, so im guessing you probably did leave on the lex afm... which obviously lets much more air go by the karman pickup than the car knows about, thus running pretty damn lean on stock injectors @ stock fuel pressure. So, i think you just diagnosed your mistake.

 

[crazysupra2JZ]

the timing was at 0 degrees. for some reason it had a tough time idleing like that so when i put it to 10 degrees it ran perfect.

 

[turbotrev]

LOL welcome to the club!!! i had the samething happen to me b/c of the injectors were all dirty and one leaned out really bad and away the piston went. the tune was a half ass one b/c the shop i took it to fucked me over hard and half assed everything and i over paid by 1500 dollars:cry: .

heres my lovely toasted piston

words of advice: dont just go for an all out build just replace whats needed and just upgrade the pistons and have it bored out. youll save alot of money and the stock bottom end will hold enough pwr for a fast dd. i retardedly went for the complete upgrade and now im goin to college and i have barely enough to get there. youll be happier in the end b/c youll be able to upgrade the turbo and shit, and youll still have a more reliable dd.

trev

 

[SupaMan]

same thing happened to my old n/a injector clogged and melted #2 i think it was....

atleast i think thats what happened seein as the injector for that cly was completely clogged shut. good luck with your rebuild! I didnt do that damage tho i bought it with a "blown headgasket" :icon_roll

 

[xarewhyayen]

the timing was at 0 degrees. for some reason it had a tough time idleing like that so when i put it to 10 degrees it ran perfect.

Did you ground the diagnostics jumper prior to adjusting the timing per TSRM?

 

[bigaaron]

Everyone with a turbo should have a wideband! It can be running lean with very high cylinder temps and still feel like it's running fine.

 

[JustAnotherVictim]

It can be running lean with very cylinder temps and still feel like it's running fine.

I'm sure that was supposed to say something else....

 

[bigaaron]

Fill in the blank, I know you can do it

 

[JustAnotherVictim]

I could if I wasn't half asleep right now.
I almost fell out of my chair a minute ago.

 

[crazysupra2JZ]

Did you ground the diagnostics jumper prior to adjusting the timing per TSRM?

no i didn't. i didn't even see that in the manual. i had no idea you have to do that. what is the purpose of that?

 

[drjonez]

Everyone with a turbo should have a wideband! It can be running lean with very high cylinder temps and still feel like it's running fine.

that is sage advice....if you're going to drop the $$ on a rebuild, spend the few hundos to get a WB....:3d_frown:

 

[crazysupra2JZ]

that is sage advice....if you're going to drop the $$ on a rebuild, spend the few hundos to get a WB....:3d_frown:

oh yeah i will. now that i have an S-AFC i can tune the car with.

 

[whenmunkysfly]

words of advice: dont just go for an all out build just replace whats needed and just upgrade the pistons and have it bored out. youll save alot of money and the stock bottom end will hold enough pwr for a fast dd. i retardedly went for the complete upgrade and now im goin to college and i have barely enough to get there. youll be happier in the end b/c youll be able to upgrade the turbo and shit, and youll still have a more reliable dd.

trev

don't tell somebody that shit of informantion unless you know what his hp goals are. if he plans to run over 500hp then he might as well do a full build now then half ass it and build later. if i had done that i would not be happy right now. our cars go for $5K+ in average condition where i live. you know how much i bought my car for? $550. Add in the $3500 to do EVERYTHING possable in my build and I'm at $4050 total so for the less then cost of buying a runing supra I now have not only a running but built supra and as long as I don't fuck up I can just do built on's now. sorry if I sound heated but please don't tell someone to just repair what's broken before you know what their over all plans are.

 

[crazysupra2JZ]

don't tell somebody that shit of informantion unless you know what his hp goals are. if he plans to run over 500hp then he might as well do a full build now then half ass it and build later. if i had done that i would not be happy right now. our cars go for $5K+ in average condition where i live. you know how much i bought my car for? $550. Add in the $3500 to do EVERYTHING possable in my build and I'm at $4050 total so for the less then cost of buying a runing supra I now have not only a running but built supra and as long as I don't fuck up I can just do built on's now. sorry if I sound heated but please don't tell someone to just repair what's broken before you know what their over all plans are.

i'm with this guy... i do plan on building up to at least 500. i'm getting JE pistons, shot peened rods and everything fully balanced. along with the ferrea valvetrain. and everything else. you guys know what i'm getting at.

 

[whenmunkysfly]

i'm with this guy... i do plan on building up to at least 500. i'm getting JE pistons, shot peened rods and everything fully balanced. along with the ferrea valvetrain. and everything else. you guys know what i'm getting at.

I have JE's so far I have had no prob. how do you plan to brake it in. you going to do it hard or soft I broke it in hard and had no prob. Engine feels realy strong

 

[crazysupra2JZ]

i read somewhere how to break in the car. i think it was in the owners manual. it says something like accelerate to 50 then slow down to 30 and keep doing it for like 6 times. i'm just gonna take it easy until it's time to retourque the head gasket then i'll open her up.

 

[whenmunkysfly]

i read somewhere how to break in the car. i think it was in the owners manual. it says something like accelerate to 50 then slow down to 30 and keep doing it for like 6 times. i'm just gonna take it easy until it's time to retourque the head gasket then i'll open her up.

sounds good just keep the revs down for a while.(1500miles)

 

[JustAnotherVictim]

http://www.mkiiitech.com/forums/viewtopic.php?t=585

 

[Mr. Y]

Looks like OEM headgasket stronger than pistons =)

PS: what spark plugs are you running? aren't they too hot?