Welcome to the North American Subaru Impreza Owners Club Monday April 21, 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 > Service & Maintenance

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 01-26-2005, 02:21 PM   #1
tuxtattoo
Scooby Newbie
 
Member#: 79032
Join Date: Jan 2005
Location: Baltimore, MD
Vehicle:
2002 Impreza WRX
White

Exclamation 02 WRX doesn't run after sparkplug change

i have a 2002 WRX with the TXS stage 4 (stock TMIC). i was getting the
occasional CEL flashing (knock) when driving on the highway in 5th gear
(about 3000-3500/rpm). since the UTEC firmware hadn't been updated since
about august 2003, i figured it was time to update to the latest.

the update went fine, and the car seemed to run a little smoother for
a while (no CEL), when it started missing slightly (and got a little worse
as time went on). so, i got some OEM replacement plugs and set out to
replace them.

i started by disconnecting the negative terminal on the battery. then i
started on the passenger side of the car by removing the harness from the
MAF on my cold air intake (AEM), and then removed the CAI tube.

i removed the back coilpack (black) first, gently (as possible) pulled
the pack off, then removed the plug. i then lightly applied dialectric
grease and never-seize to the plug (appropriate ends , threaded the
plug by hand, and tightened the plug with about a 1/4 turn, and replaced
the coilpack and harness.

i then repeated the steps above for the the front (white) coilpack and
plug. after the front coilpack was back on, i put the CAI tube back on
and forgot to plug in the MAF harness (this is the only thing i think i
screwed up on).

i reconnected the batttery, hopped in the driver seat and fired her up
(she was using the stage4 map/parameters found on TXS site). naturally
she didn't run well and it was then i remembered the MAF sensor. after connecting
the MAF sensor, i went back and tried again. she would start, the RPMs would
kick up to the normal warmup/idle speeds, then immediatly die. i tried
this a few times with the same results.

so, after taking the plugs back out, verifying the gaps, cleaning the
dialectric grease and never-seize, i put them back in again. same results,
so i took out the new plugs and put back the plugs that were in there before.
same thing again. so, i flipped my map selector to map 0 for stock mode, and
tried again. she actually started, sounded good for about 3-5 seconds, and
then started missing terribly. the car would run like this, although poorly,
and even let me give it gas (with nothing really even resembling a decent
throttle response). if i let it idle by itself, sometimes it would stop
missing, and start idling like normal, but then quickly start missing terribly
again.

i then decided that i would re-flash my UTEC with the latest updates (it
was already running it, but i was out of ideas). so, i re-flashed my UTEC,
and reloaded the stage 4 maps, and tried again. still not running correctly.

at this point in time, there were no codes being thrown, so i had no idea
what the problem was. i didn't touch anything on the driver side, nothing
else anywhere on the car, etc. in an attempt to see if maybe i broke the
coilpacks, i unplugged the harnesses one at a time. the car actually ran
(at least the same, maybe a little better) on *only* the two driver side
cylinders than it did with all 4.

aha! coilpacks, i thought. so, i replaced both the coilpacks i touched with
brand new genuine subaru coilpacks. no love, still the exact same behavior,
but now it finally threw a code. MAF and misfires on all 4 cylinders.

dang, the MAF! so, i shelled out another $200+ for a brand new genuine
subaru MAF praying that it would work. it didn't.

we've looked for vacuum leaks, grounds, reset the ECU a dozen times,
tested the MAF and coilpack harnesses against what the factory shop
manual says they are supposed to be, etc.

i am really sorry for this long winded post, i am hurting for ideas as
is the mechanic who's shop my car was taken to. any ideas, suggestions,
advice, would be greatly appreciated as i am pretty much at the end of my
wits (and savings) from throwing money into replacement parts that didn't help.

thank you all for your ideas and suggestions
* Registered users of the site do not see these ads.
tuxtattoo is offline   Reply With Quote
Old 01-26-2005, 06:09 PM   #2
finnRex
Caps 2012
Moderator
 
Member#: 21095
Join Date: Jul 2002
Chapter/Region: TXIC
Location: Miss you, Charlie Murphy.
Vehicle:
RIP KTH & LMFH
'09 Crystal red Tintcoat

Default

MAF code was triggered because you tried to start the car without the MAF connected. As far as the misfire codes, did you do anything to the crank position sensor? Also, I'd check up with Turbo XS and see what happens when you disconnect the battery, and cause the ECU to relearn. <---My guess that's the problem, and you need to flash the map that you have in your UTEC back into the ECU.



Mika
finnRex is offline   Reply With Quote
Old 03-30-2005, 03:11 PM   #3
Subdued
Scooby Specialist
 
Member#: 15904
Join Date: Mar 2002
Location: WA
Vehicle:
05 Impreza
09 Tribeca

Default

Did this get resolved?
Subdued 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
02 wrx wont start after timing please help ej20wagon02 Service & Maintenance 6 04-03-2009 02:05 PM
P0037 cel after sparkplug change xxlostxx Factory 2.0L Turbo Powertrain 1 06-21-2008 12:59 AM
02 WRX - First Runs at Stage 4 Strng1dah Proven Power Bragging 30 11-30-2006 09:23 PM
02 wrx part out after trade in Scoob02 Private 'For Sale' Classifieds 2 03-31-2004 07:44 PM


All times are GMT -4. The time now is 02:56 AM.


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.