Welcome to the North American Subaru Impreza Owners Club Saturday September 20, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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 Technical > Engine Management & Tuning

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 03-15-2006, 04:36 PM   #1
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default Misfiring after Reflash! Help!

im using Engenuity editor and ecuExplorer/EcuFlash to load and flash the stock ecu.

i loaded a slightly tuned map to my car last night and it ran pretty decent except for a little bit of rough idling.

today i drove it for about 10 miles and was running about 10psi when it just started to die on me.

i pulled over and now when i try to start it. it just misfires from the beginning and it shuts itself down.

any idea on what to start or anything?

could i have fouled the plugs?
could the ECU try to learn over itself?
* Registered users of the site do not see these ads.
mtxfrk2k1 is offline   Reply With Quote
Old 03-15-2006, 05:15 PM   #2
JRSCCivic98
Scooby Specialist
 
Member#: 67080
Join Date: Jul 2004
Default

This is what happens when you try and run someone else's map on your car. Did you do any logs on the car as you drove it first and did you even put a wideband on it to make sure the A/F ratio was ok for your perticular application? You can do what you're doing if you don't use the right tools for the job. I know this doesn't solve your problem, but this is how people blow up their cars. I hope you haven't done that.
JRSCCivic98 is offline   Reply With Quote
Old 03-15-2006, 09:18 PM   #3
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default

it will idle and rev to 4500 just fine with the MAF unplugged.

as soon as i plug the MAF in, the car idles like **** and will sometimes stall out.

it also sounds like the intake is sucking in alot of air just while sitting there idling.

what all could it be?
mtxfrk2k1 is offline   Reply With Quote
Old 03-15-2006, 09:23 PM   #4
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default

http://www.zippyvideos.com/1866425994312726/100_0653/

thats a video of when it was doing good.

it idled and ran great...

now it doesnt...
mtxfrk2k1 is offline   Reply With Quote
Old 03-15-2006, 09:57 PM   #5
JRSCCivic98
Scooby Specialist
 
Member#: 67080
Join Date: Jul 2004
Default

Flash back to stock. If it still drives and sounds like crap, then you've probably killed something.
JRSCCivic98 is offline   Reply With Quote
Old 03-15-2006, 10:36 PM   #6
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default

it still does it with stock map.

we have it narrowed down where it cant be spark plugs because when we unhook the maf they all kick in and run normal, which means there is atleast some compression for all 4 pistons which means a valve isnt bent.

im thinking boost/vac leak or something of that nature.. gotta take everything out and try again i guess.
mtxfrk2k1 is offline   Reply With Quote
Old 03-16-2006, 10:05 AM   #7
JRSCCivic98
Scooby Specialist
 
Member#: 67080
Join Date: Jul 2004
Default

There may be a leak somewhere with that APS FMIC setup you have... or it could be a botched engine from a crappy map you thought would work for your car. It's hard to say without being there. What else changed when you did the reflash?
JRSCCivic98 is offline   Reply With Quote
Old 03-16-2006, 11:13 AM   #8
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default

we installed new turbo, fuel pump, injectors.


the fuel pump kicks on strong and everything.

we thought the turbo seized up but its still spinning great and everything.

the injectors are stock modded ones scaled to 740.
mtxfrk2k1 is offline   Reply With Quote
Old 03-16-2006, 11:35 AM   #9
happasaiyan
Scooby Specialist
 
Member#: 37731
Join Date: Jun 2003
Chapter/Region: MWSOC
Location: Rolling Meadows, IL
Default

its a boost leak post MAF. if you had a wideband, you would most likely see <8:1AFR. with a leak that big, it should be pretty easy to pinpoint.
happasaiyan is offline   Reply With Quote
Old 03-16-2006, 12:49 PM   #10
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default

my friend is coming to pick me up. we are going to go check it out . we are going to remove all the IC piping check for holes in the hoses or piping.

could it be a bad MAF? any way to check?
mtxfrk2k1 is offline   Reply With Quote
Old 03-16-2006, 06:22 PM   #11
happasaiyan
Scooby Specialist
 
Member#: 37731
Join Date: Jun 2003
Chapter/Region: MWSOC
Location: Rolling Meadows, IL
Default

Quote:
Originally Posted by mtxfrk2k1
my friend is coming to pick me up. we are going to go check it out . we are going to remove all the IC piping check for holes in the hoses or piping.

could it be a bad MAF? any way to check?
check where the couplers are. i bet it will be easily visible. mine always popped off on the coupler pre-intercooler...on both ends of the coupler.
happasaiyan is offline   Reply With Quote
Old 03-16-2006, 10:57 PM   #12
mtxfrk2k1
Scooby Newbie
 
Member#: 103401
Join Date: Dec 2005
Chapter/Region: MAIC
Location: Summersville, WV
Vehicle:
2005 WRX
WRB

Default

lol coupler actually split. i just looked where it was connected.. so it is fixed now.

to think 19psi could do such a thing...

on a completely self road tuned first try
mtxfrk2k1 is offline   Reply With Quote
Old 03-17-2006, 07:04 PM   #13
happasaiyan
Scooby Specialist
 
Member#: 37731
Join Date: Jun 2003
Chapter/Region: MWSOC
Location: Rolling Meadows, IL
Default

Quote:
Originally Posted by mtxfrk2k1
lol coupler actually split. i just looked where it was connected.. so it is fixed now.

to think 19psi could do such a thing...

on a completely self road tuned first try
i feel your pain, my friend.

i did injectors/fuel pump/turbo/fmic all by myself all in one shot...i was tuning it myself with my utec...and once i worked up the boost safely to 19psi, the hose blew off, and the car died...and i was on the side of the highway underneath my car trying to get the hose on enough to get the car to run long enough for me to get home so i could re-tighten it. got home, retightened it....then went for another run (this time with the tools in hand ) and when i hit 19psi again, the other end blew off. i think this happened a couple more times before i just ended up using the clamps that came with the APS kit. (the t-bolt clamps were actually too slippery to hold the boost- ymmv). no problems running 23psi now.
happasaiyan is offline   Reply With Quote
Old 03-18-2006, 09:41 PM   #14
colby
Scooby Newbie
 
Member#: 15918
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
08 STI/02 PGT WRX
DGM / Orange

Default

glad you got it working... it sure seemed like a hose must have popped off somewhere...

Colby

Quote:
Originally Posted by mtxfrk2k1
lol coupler actually split. i just looked where it was connected.. so it is fixed now.

to think 19psi could do such a thing...

on a completely self road tuned first try
colby 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
Help! Engine misfire after boost gauge install... wrxsomeday Factory 2.0L Turbo Powertrain 9 09-16-2009 06:25 PM
first cylinder 1 misfire, after plugs, 1,3,4 misfire! DieselClown Factory 2.0L Turbo Powertrain 32 08-26-2008 02:59 PM
Misfire on cylinders 2 and 3 after reflash Farns801 AccessPort 2 04-21-2008 09:09 PM
help 05 sti misfiring after head gasket change takumi Factory 2.5L Turbo Powertrain 1 12-13-2007 09:29 PM
Need Help! Car Misfiring after install!!! Bad! boozy04 Factory 2.0L Turbo Powertrain 15 12-18-2006 11:08 PM


All times are GMT -4. The time now is 07:37 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.