Welcome to the North American Subaru Impreza Owners Club Tuesday June 2, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Rocky Mountains Impreza Club
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Chapters > Rocky Mountains Impreza Club Forum -- RMIC

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 05-05-2012, 10:24 PM   #1
Derk Deez
Scooby Newbie
 
Member#: 265246
Join Date: Nov 2010
Chapter/Region: RMIC
Location: SLUT
Vehicle:
2006 STi
Make ya say giggggittyyy

Default misfire on all 4

So the story goes, I installed an aps intake a couple days, trading out my cobb short ram due to high intake temps. I got retuned last night with Jesse from True Tune. Everything seemed legit, minus the tire rubbing against the fender liner from the filter pushing on it. Therefore, this morning, I ended up reinstalling it to avoid any rubbing. Drove out to RSD, then to a soccer match, mostly all highway, afr's looked fine. When I got home after the four starts and drives, I went to start her up to roll out to Wally World, CEL came on. I hit up Autozone to pull the codes, turned out all 4 were misfiring. I looked over the aps intake, seems legit. Spoke with Jesse, and he's suggesting a vacuum line could've popped off. What's everyone's opinion. Car is heavly modded: rallispec block, dom 3r, 1000cc inj, dw300lph, aps dr525 and aps 70mm intake. Any hoses to specifically look for? I briefly looked it over and found nada. Thanks
* Registered users of the site do not see these ads.
Derk Deez is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-05-2012, 11:02 PM   #2
axleon2
Scooby Guru
 
Member#: 154117
Join Date: Jul 2007
Chapter/Region: RMIC
Location: Midvale, Utah
Vehicle:
2004 WRX
JBP

Default

Should have traded for the kn, problem solved. Jk good luck I hope you figure it out man...
axleon2 is offline   Reply With Quote
Old 05-05-2012, 11:05 PM   #3
Derk Deez
Scooby Newbie
 
Member#: 265246
Join Date: Nov 2010
Chapter/Region: RMIC
Location: SLUT
Vehicle:
2006 STi
Make ya say giggggittyyy

Default

Me too, cause I'm car less until it's figured out. Weird that it happened either the day after taking 6-7 WOT pulls or after I reinstalled the intake. Any suggestions?
Derk Deez is offline   Reply With Quote
Old 05-05-2012, 11:15 PM   #4
axleon2
Scooby Guru
 
Member#: 154117
Join Date: Jul 2007
Chapter/Region: RMIC
Location: Midvale, Utah
Vehicle:
2004 WRX
JBP

Default

Hey Derk read about Brian's aka 08WhiteWRX's car in the "I got bored and did ____ to my car" thread. He was having the same problem and it ended up being a small hose under the intake manifold. He found it by doing a leak test with smoke. Hope that helps...
axleon2 is offline   Reply With Quote
Old 05-06-2012, 12:22 AM   #5
08WhiteRex
Scooby Specialist
 
Member#: 187453
Join Date: Aug 2008
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
2012 Mulletmobile

Default

Okay well i went about mine in a pretty methodical way. First thing i did was check over the entire intake and PCV system visually as best i could to see if i had any big leaks. Again, i stress this even more, BE AS THOROUGH AS YOU CAN.

My list of things to do if i were to do it again in order:

1) Follow the main harness down and make sure all grounds are present and secure. Make sure all plugs are connected correctly and there aren't any faulty connections. This is an easy step and was high on my list of what caused my misfire because a ground can rattle loose and cause all types of weird stuff to go wrong.

2) Make a leak tester out of a PVC cap for 2" ID piping and put a shrader valve in the end of it and put it in the inlet where the intake goes. Hook up an air compressor with an air chuck and pressure up your intake tract. It SHOULD hold pressure up to like 30 psig. Try not to exceed that or else you may start rupturing things/ popping things off. Put a good tire pressure gauge on the shrader and see if the pressure is dropping. Spray everything down with some soapy water and if there are any small leaks you will see it bubbling. If there it's not holding pressure like my car, find a smoke source (we used a hookah, our lungs, some rubber hosing, and some duct tape) and you'll see where the air is escaping.

3) If it's holding pressure, find/borrow/ rent an inline fuel pressure tester and hook it up to the upstream side below the fuel pressure regulator. Prime the fuel system by turning the ignition on (not cranking the motor!) until the gauges do a full sweep, repeat 4 or 5 times and fire it up when you're confident the system is primed. The pressure should hold steady at around 40 psig. If it's too low than move the pressure tester above the regulator and see if it changes. If not, then you have a faulty pump assembly, clogged filter, or a leaking o-ring upstream on the supply side.

4) If all of those check out, which they probably won't, start trying to find people that have extra sensors lying around. You're going to want to check your Crank Position Sensor, Cam Position Sensors, and your MAF Sensor. If you swap one of them out and it fixes it, you've found your problem.

5) The last thing i would do, (which i did, in vain) is pull the timing covers and MAKE DAMN SURE YOUR TIMING MARKS ON DEAD ON. It's improbable but you may have jumped a tooth on timing. This truly sucks and when you have gorilla hands like me, retiming the motor in the car will quickly become your least favorite thing of all time.

If none of these work then you've got a wonky issue. It COULD be that the injectors are all clogged, your ignition system has a short or something, or that the harness has encountered a failure. Finding those will be less fun than it already is.

Hope that helps!!

-BS
08WhiteRex is offline   Reply With Quote
Old 05-06-2012, 10:14 PM   #6
PCSkiBum_21
Scooby Specialist
 
Member#: 164437
Join Date: Nov 2007
Chapter/Region: RMIC
Location: Park City, UT
Vehicle:
EVO IX - Track Car
BRZ - Daily

Default

hey dude, let me know if you want to come over and use my boost leak tester. i have an adjustable valve on it with a pressure gauge that will be a little easier to use.
PCSkiBum_21 is offline   Reply With Quote
Old 05-07-2012, 07:05 PM   #7
Derk Deez
Scooby Newbie
 
Member#: 265246
Join Date: Nov 2010
Chapter/Region: RMIC
Location: SLUT
Vehicle:
2006 STi
Make ya say giggggittyyy

Default

Zero boost leaks. I have an inline fuel gauge, pulling 40 psi at start and idle. Pulling the learning curve and checking the ignition components. Sparks were changed at 60k, less than 20k on em. Possibly coils, but to throw a misfire in all four cylinders??
Derk Deez is offline   Reply With Quote
Old 05-07-2012, 10:47 PM   #8
907Bum
Scooby Specialist
 
Member#: 183634
Join Date: Jul 2008
Chapter/Region: RMIC
Location: At the "B"
Vehicle:
02 wrx/ 92 ss
Booze fueled :)

Default

Turns out it was my bad guys, I added a weee bit too much fuel on start up (to compensate for the tgv deletes), simple re-flash to pull some out and the miss will be gone.


Sorry bud!
907Bum is online now   Reply With Quote
Old 05-07-2012, 11:32 PM   #9
axleon2
Scooby Guru
 
Member#: 154117
Join Date: Jul 2007
Chapter/Region: RMIC
Location: Midvale, Utah
Vehicle:
2004 WRX
JBP

Default

Quote:
Originally Posted by 907Bum
Turns out it was my bad guys, I added a weee bit too much fuel on start up (to compensate for the tgv deletes), simple re-flash to pull some out and the miss will be gone.

Sorry bud!
No big deal Jesse, just people's engines we're dealing with here...
axleon2 is offline   Reply With Quote
Old 05-07-2012, 11:53 PM   #10
zackl801
Scooby Specialist
 
Member#: 171753
Join Date: Feb 2008
Chapter/Region: RMIC
Vehicle:
2012 WRX
DGM

Default

Quote:
Originally Posted by axleon2 View Post
No big deal Jesse, just people's engines we're dealing with here...
Started out positive ^ then ended negative
zackl801 is offline   Reply With Quote
Old 05-07-2012, 11:59 PM   #11
axleon2
Scooby Guru
 
Member#: 154117
Join Date: Jul 2007
Chapter/Region: RMIC
Location: Midvale, Utah
Vehicle:
2004 WRX
JBP

Default

Just giving Jesse a hard time I haven't heard of any big issues with his tunes...
axleon2 is offline   Reply With Quote
Old 05-08-2012, 12:12 AM   #12
Derk Deez
Scooby Newbie
 
Member#: 265246
Join Date: Nov 2010
Chapter/Region: RMIC
Location: SLUT
Vehicle:
2006 STi
Make ya say giggggittyyy

Default

Misfires were only upon startup apparently. 200 dollars later... Hopefully the flash will correct everything.
Derk Deez is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Misfires on All 4 Cylinders - Cold Weather Related StealthREX Service & Maintenance 16 11-07-2009 06:34 PM
Misfire on all 4 cylinders....why? skyline31 Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 14 05-28-2007 09:11 PM
Misfire on all 4 02REXX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 20 06-22-2006 08:16 AM
misfire on all 4 cylinders kettsupp Service & Maintenance 6 05-07-2005 09:09 PM
misfiring on all 4 cylinders tEkkGOD Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 12 09-08-2003 09:26 PM


All times are GMT -4. The time now is 04:39 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.