MARS1

Could try, it only seemed unecessary at the time as the tester was used on a previous car 2 minutes earlier.... Worst part is, when I had a leak at the tank, it would leak gas and smell real bad, but no codes....!! This is really annoying... Don't know where else to look on this one...

I did check wiring and nothing seems to be standing out as of now...and I do not think it would only act up on high load. I did not do a leak test on 1 and 3 as they are not showing signs of any roughness or misfires. Can you elaborate on why I should..!? From what I know, 10% leak is pretty standard on a 2.5L... and with 145 compression, I do not suspect anything from the cylinders, a faulty ringland would show a certain sign on the leak down...I think.... The only thing I can think of now would be related to fuel... a faulty pressure regulator?!?! a leak in the tank??! Any more ideas or similar experiences...?!

Okay, I have a good one for you guys.... LGT 05, STi swap, running all this for a year now.... standard fuel hoses and side feed injectors. Walbro 255 in tank Car has been running fine for ever with no idle roughness or knock present... one day, slight pull, misfire cylinder 4.... changed (on both cylinder 2 and 4): -coil packs -spark plugs -injectors changed the fuel pump assembly seal and metal ring holder Leak down test on both gave me 10% leak, almost perfect... Compression test gives a 145, 147 on respective cylinders Checked for vacuum leaks, cracks....nothing swapped injectors,coils, spark plugs....no change....it persists on cylinder 4, sometimes 2....regardless of swap-arounds.... everytime I played with the seal for the fuel pump, it was worst or better, depending on the "seating" of the damn thing...so I sealed it up with urethane(yeah, I know...) and the whole thing was pretty sealed thight....but still the misfire on cylinder 4, but under heavy load only!!! Maps and such are out of the equation as the car ran perfect for a year without any glitches... Car still runs perfect up to 14psi, but no more....no heavy gas consumption or anything that would suggest any problem, until the throttle is squeezed fully... I'm at wits ends....any ideas.?! Please.... Thanks for your ideas...