Hi everyone,
I know there have been many posts about misfiring and boost leaks but through all those posts I could not find an answer to my problem.
I am new here and new to forums in general. I have been referred my a friend of mine to post my issue here. So hopefully someone will be able to help. Thanks in advance.

my car:
2003 evo 8. mods evo 9 turbo 27psi, manual boost controller, 272 cams, 750 cc fuel injectors, 255 walbro fuel pump, injen intake piping, g reddy BOV.

My issue:
This past winter I ran the boost to high and blew the throttle body seals. which in turn caused a boost leak. so I sent the throttle body out to have it rebuilt completely with high pressure seals. changed spark plugs ngk bpr8es gapped .024. did a boost leak and corrected any leaks. (I did notice that around the BOV nut that tightens the valve pressure had a minor leak and it did not stop when tightening the nut)
My issue is I have a misfire when ever I run the car full throttle at around 20 psi or higher with rpm around 3500-4500 the car sounds like its skipping or farting. I have pulled the coils and wires (stock ignition system) to make sure they were reading correct. wires read at 1.8 ohms ( I believe this is a good reading) coils couldn't get them to register a read out on my altimeter for some reason. ( could not find what ohms the coils should read at will try again if someone knows the ohms) coils looked clean though.
my next step is to check the fuel injectors maybe they are dirty.
If there is anything that I may have forgotten to check or should check please let me know.
Maybe the BOV leak is my problem?

 

gap down to 0.020 and try again.

 

Any exhaust leaks? I've had this 'hiccup' & 'fuel cut' like symptoms twice now....

FIRST TIME - I solved it by replacing my stock coils with used low mileage oem coils, new plug wires and I replaced the plugs while I was there....Problem came back about a year later.

SECOND TIME - Exhaust leak at my HF cat (Vishnu Standard 3" TBE). Put OEM exhaust and cat back on for CA smog and problem was nonexistent. RE-installed my Vishnu exhaust with new gaskets throughout and problem solved... again. No problems as of today.

Any cel codes?

Fuel pump going out?

Keep us posted.. Someone else throw this guy some ideas.

 

Thanks for the quick replies and ideas.
Unfortunately at the moment I was changing my stock radiator to CBRD's 1" and there was a mistake on the radiator. so I have to send it back to them so they can fix it. which means I can't run the car or test these ideas until I get the radiator back which will be about a week. I will keep you posted once I do get up and running.
Thanks again

 

we will get it turned around immediately-

also ditch those plugs-

get some BPR7EIX- gap to .020

cb

 

Alright radiator installed, by the way cbrd 1" slim radiator is sooooo sexy. so I gapped the NGK bpr8es plugs down to .020 and no more problem! Thank all for the help and quick replies.