2002 subaru wrx knocking - damaged piston from running lean

2002 wrx, ej257, ej205 heads, BC 272 cams, cometic thick gaskets, vf39, sti tmic, pink injectors, perrin rails, cobb tbe, cobb accessport v2, sti oil pump.

Oil pressure at idle is 20psi, no metal in oil or filter, timing is correct, valve clearance is in spec, cylinder 3 is slightly lower in compression and leak down test, no shaft play in turbo.

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People & Blogs

Tags:

• subaru
• wrx
• knocking

[sk8nsnow14]

what are your headers?

[topher170]

@sk8nsnow14 tomei UEL

[CVRealMan]

By the looks of things, you didn't build your bottom end did you?

[topher170]

@CVRealMan It was a stock sti short block. The pistons are the weak link in the sti blocks. It ran lean due to an intake leak and trashed a piston. It has forged pistons and rods now.

[reita357]

Hey topher I am having the same problem as you with the damaged piston and it just coincidentally happened also to be Piston 3, I also have an STi with EJ257 shortblock but EJ205 heads. Was wondering how much it cost you to fix ? and what job you did to fix it ?

[topher170]

@reita357 cylinder 3 is closest to the turbo and gets hotter than the others, which is why it usually is the first one to go. Cost will depend on what else you want to do while it's apart, and how badly the cylinder was damaged. I do all of my own work, so that saves a lot of money. I don't have a clue what it would cost to pay someone to fix it, but I spent less than a grand getting mine back going, and that includes buying the new pistons. I already had a set of rods laying around.

[badmoonryzn]

@ZINK454545 All of this bravado from a kid who rides a bike every place he goes. What a yo yo! Yea, that Schwinn of yours really gets the chicks. By the way your spelling, punctuation and inability to form a sentence puts you at flunking third grade. Picking on someone when you are obviously the one who needs lots of help makes you look like such a moron. I hope you go back to school, get some psychological help and quit doing drugs.

[fastflat4]

@ZINK454545 your a troll. get out. imports are sick. My 2.1 stroked subie walks muscle cars. usually when they are left looking for traction wishing they drove awd :)

[sirzycki81]

Y weren't any of the pullies spinning? Or belt was the motor even running

[SteveSupreme5k]

HA,nice they dont actually burn rice, its called Premium 93 octane

[DirQ89]

this may sound dumb but could it have been an exhaust leak from either the up-pipe or downpipe?

[bassbone1785]

@topher170 while that is true that cyl 3 is closest, the extra heat from the turbo makes no difference because the cylinder is surrounded by a water jacket, the coolant would absorb the extra heat. Cyl 3 is the more restrictive port in the header, so that's what I would blame the extra EGTs on that cylinder from.

[mrchopasaurus]

@ZINK454545 Fuck off, u redneck hick.

[R1Wagon]

Must have a lot of CEL codes without strap and MAF!!!!!!! lollll

[Syzygy236]

heres another way to look at it, this is just a good excuse to take the engine out build that bad boy.

[AWDfreak]

@ZINK454545 obvious troll is obvious :P