fuel cut off around 5K rpm???

[flutyr525]

so i just installed a STi OEM TMIC on my 04 wrx today. the car ran and idled perfect but when i took it for a drive after the install i really pushed it and the fuel cut out around 5-5500 rpm. the car stayed running and i could drive it just fine. still built boost just fine. u would never know a difference until u hit that rpm range and the fuel cut out. not throwing the check engine light or anything. any ideas of what could be wrong?

[bobanoid]

i would check all the couplers and possibly the seals from the TMIC to the Y-pipe, also the seal btwn blow off valve and TMIC. if those all seem good then look to make sure you didnt do anything to the throttle cable while installing. generally tmic dont need to be tuned they arent flowing any extra air theyre just keeping it cooler so it doesnt seem like a tune problem. if you have an AP i would reset your ecu, or pull your batt terminal for 10 min could just be that your car doesnt like the change yet.

[stylesrex]

the situation you described sounds like what happens when you overboost.  it usually throws a CEL, but not always.  see if you can create the cut out again and watch your boost levels.

i know that cobb has staged "canned" maps that include one for upgraded tmic, id suggest looking into those.

[BradleyGT]

definatly OB. look into the cobb maps styles mention, should take care of the problem

[flutyr525]

i def look into the different maps but the maps that are up on the cobb website dont seem like they will help so ill have to email or call cobb themselves about a different map. i havent taken it out again since the initial test drive after the install because ive been busy with work and what not. im off today tho so ill try to figure it all out. thanks

[flutyr525]

ok so i FINALLY got the opportunity to take the wrx out for a ride that was longer than 2 minutes around the block a couple times. bad news tho. it took a little longer to start than usual but i didnt think anything of it since its only 31 degrees outside and the car hasnt been started in over a week. as from the first time after the install when i drove the car briefly, it seemed fine for the first minute or 2 and then started to sputter...only maybe 3 seperate times in a 5 minute, 1.5 mile stretch until i came to a red light. as i was idleing it started to sputter. i got on the high way and was sputtering occationally but i had no problem getting up to 5500 rpms and 75mph. it progressively got worse after i got off the highway and then the wonderful check engine light started flashing as it was sputtering at its worst. but then the sputtering subsided for the most part and the check engine light went away. (only lasted maybe 30 seconds total around 40mph give or take 10mph) parked the car and left it running as i checked under the hood...a friend told me to check the wastegate tubing as well as all the clamps and bolts and everything looked good. turned the car off for about 5 or so minutes and then got on my way back home. after only a minute or so the sputtering started again and then the check engine light came on and stayed on this time. in the 3ish mile trip home the check engine light only flashed momentarily once and was constantly on for the rest of the trip. used my AP to check what the code was when i got home and it was a P0304 and a ??. idk if the '??' is an actual code that the AP doesnt recognize or if that is a default response when checking the cel codes. as most of you probably already know, the P0304 is a misfire code. never had this code come up and have had the car for over a year and a half and 40K miles. i install a used oem STi tmic and i get this code.

what does everyone think? at first i was thinking that maybe the IC is leaking or is damaged in some way that isnt visual or something but doesnt really make sense (to me anyways) that i would now have a misfire from putting a slightly bigger, oem ic on the car. idk 

[byroll01]

check your plugs.  A flashing CEL is a real misfire happening at that moment.  Also have you checked for tubing/vacuum leaks?  I have a piping pressure tester we could use.  But usually leaks will make your car idle funny and stall, not sputter while you're driving.


oh yeah, the 4?'s is a code that the AP doesn't recognize.  The ap's do that if you're throwing a code that has been disabled...my STi kept showing that when it was trying to display a misfire code but they were all disabled. 

[auto0utcast]

p-0304 is cylinder 4 misfire specifically... the p0300 codes run down as follows.
p-0300 random multi cylinder misfire
p-0301  cyl 1 misfire
p-0302  cyl 2 misfire, etc... just make sure you dont throw a p-0305.. thatd be awkward.

[flutyr525]

check your plugs.  A flashing CEL is a real misfire happening at that moment.  Also have you checked for tubing/vacuum leaks?  I have a piping pressure tester we could use.  But usually leaks will make your car idle funny and stall, not sputter while you're driving.


oh yeah, the 4?'s is a code that the AP doesn't recognize.  The ap's do that if you're throwing a code that has been disabled...my STi kept showing that when it was trying to display a misfire code but they were all disabled. 

i havent checked the plugs but i dont feel i have the knowledge base enough to do so and make a good judgement call. i would love to test the pressure if youre down. im just confused as to y installing the IC would cause a misfire 

p-0304 is cylinder 4 misfire specifically... the p0300 codes run down as follows.
p-0300 random multi cylinder misfire
p-0301  cyl 1 misfire
p-0302  cyl 2 misfire, etc... just make sure you dont throw a p-0305.. thatd be awkward.

i hope that doesnt happen 

[byroll01]

it shouldn't cause it, it could just be a random coincidence.  I have free time on wed. if you do we can check it.

[blufnrckar]

I have an extra set of ngk irdiums one step colder-your welcome to try those. Let me know I'm in Clifton Park everyday(I'll keep them in the car
-pm you my cell!

[byroll01]

those aren't wrx plugs...sti are different. sorry,,,

[blufnrckar]

those aren't wrx plugs...sti are different. sorry,,,

so much for trying to help

[idipskoalmint]

so much for trying to help

It's alright, Rick - it's the thought that counts

[byroll01]

yeah, it's ok, I still gave you +1

[blufnrckar]

Thanks guys right back at ya +1 ,+1

[flutyr525]

yes thanks rick +1 for you. i just had the plugs replaced about 6 months ago with pulstar plugs. i unfortunatly have to work overtime 6-4 wednesday and wont be home until 5ish. how about next wednesday?

[flutyr525]

so i finally go the car to a dealer to have them diagnose it. they seem to think the problem my spark plugs so im going to be purchasing a new set. looking for suggestions on performance plugs. i have pulstar plugs in there now but they were only installed for less than 6 months and apparently went bad already so im not going that route again.

[bignickbugeye]

ive been sporting NGK one step colder plugs for a couple months with my 18g set up and haven't had a problem.  they say you should be running 100+ hp over stock to use them.   idk what your car is at...  just my $0,000,000.02

[byroll01]

i'd say ngk or denso iridium or platinum stock heat range.  but that's just my .02 as well

[Photofixer]

update , What happened to the ride ?  I would like to know what the issue was and how to resolve it.

[flutyr525]

ive been sporting NGK one step colder plugs for a couple months with my 18g set up and haven't had a problem.  they say you should be running 100+ hp over stock to use them.   idk what your car is at...  just my $0,000,000.02

i'd say ngk or denso iridium or platinum stock heat range.  but that's just my .02 as well

thanks for the 2 cents guys +1. anywhere i can purchase ngk's other than the wonderful world of internet?

update , What happened to the ride ?  I would like to know what the issue was and how to resolve it.

after i installed the sti tmic i started having problems but it turned out it was a bad coinsidence and it was just my spark plugs apparently that went bad even tho they were only maybe 6 months old. hopefully this will solve the problem and if not then i have a feeling its going to be a lot more complicated.

[bignickbugeye]

anywhere i can purchase ngk's other than the wonderful world of internet?

idk man, i got mine on the interwebz.  i just did a minor search for a retailer that carry them but came up dry,  sorry.

[byroll01]

i know you could get the platinum's at advance auto.  IDK about the iridiums.

[flutyr525]

cool cool...thanks for the help guys and ill keep you posted.