misfire on cylinder 4

blankito350 · Apr 21, 2009, 08:49 AM

yesterday after race with a STI... my car felt rare! something was wrong and sound wrong, i stop immediately and check the spark plugs!(4th) wow i notice that is was damaged and gapped like if I throw it to floor... now im going disassemble the head to see what happened there!

...

i think there is some valves and 4th piston broken... where can i get this parts aftermarket? and obviously that hold 10 pounds of boost...

my setup: 10psi boost, 60 (Fuel press), EVO9 fuel pump w/return line, WRX injectors(blue), 3" exhaust with oem axle back(i know i have to change it), and the big problem (head is cut .30@ machineshop) <N/A first mistake

hackish · Apr 21, 2009, 03:17 PM

What are you doing for engine management? If it's a 5th injector then yes the 4th cylinder always goes. I know of at least 4 different engines here in Canada that have suffered that fate.

blankito350 · Apr 21, 2009, 05:39 PM

i have not 5th injector... I open the engine and cylinder 4 is all damage... piston 4 is broke, and all other 3 have valves marks on the top...

OttRalliart05 · Apr 21, 2009, 10:32 PM

Quote:

Originally Posted by blankito350

i have not 5th injector... I open the engine and cylinder 4 is all damage... piston 4 is broke, and all other 3 have valves marks on the top...

What are you using for fuel management??? I was looking at your youtube videos trying to see a AFR with no success....can you give more detail on your set up??

Nice car ......