Car dies randomly and under heavy braking - Page 2 - Subaru Impreza GC8 & RS Forum & Community: RS25.com
 
Private Support i-Trader Ratings Become a Vendor Rules for VendorsModsUsers Contact
Subaru Impreza GC8 & RS Forum & Community: RS25.com
gc8 RSS GC8 Facebook Subaru GC8 Twitter Subaru YouTube Channel Subaru Sticker
 
Login below or Register Now
Register Mark Forums Read FAQ Advertise
Go Back   Subaru Impreza GC8 & RS Forum & Community: RS25.com > >
Car dies randomly and under heavy braking
Reply
 
Thread Tools Display Modes
Old 06-12-2019, 03:45 PM   #11
SoCoNoHa
2.7L
 
Fav Mod: Anything custom
Join Date: Feb 2018
Location: Southern NH
Trader Rating: (1)
Posts: 345
Default

After some testing, it seems to stumble and bog after engine braking for more than a couple seconds. The brake doesn't seem to be necessary, but can cause the symptoms even without engine braking.

I'm gonna try rewiring my car so instead of thinking it's in 'D' when in gear, it'll think it's in '1'. In my head, that'll hopefully prevent my recurring IACV codes (0507/1507) and stop the stalling.

I believe a manual cam and crank trigger are required to swap to a manual ecu. Probably some additional wiring. Does anyone know if there's anything else? IACV?
__________________
92 SVX / 95 GM2 / 02 GDE / 03 GDA
SoCoNoHa is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-12-2019, 08:15 PM   #12
AndrewB23
1.8L
 
Car: 1998 Impreza 2.5rs
Join Date: Feb 2019
Trader Rating: (0)
Posts: 32
Default

So I finally got a code for 1507 idle control failure which hopefully means you guys are right, so tomorrow I'll be picking up a different one. I really hope it solves the issue because I figured out the consistent 1&3 miss was because cylinder 1 injector was popped out of the rail a little I probabaly didn't completely seat it when I installed new o-rings, it's all good now though.
AndrewB23 is offline   Reply With Quote
Old 06-13-2019, 07:07 AM   #13
Jack_Stalk
www.jackstalk.com
 
Jack_Stalk's Avatar
 
Join Date: Oct 2008
Location: New Jersey
Trader Rating: (47)
Posts: 5,373
Default

Ive known several people that did auto-manual swaps on their 93-01 subarus and every single one of them experienced idle issues and the car randomly dying. I dont remember if anyone remedied the situation but i know bansheeboy11 has some experience with this happening on two different cars. Most of the people got frustrated and dumped the car to get one with a factory 5spd
Jack_Stalk is offline   Reply With Quote
Old 06-13-2019, 09:24 AM   #14
silverton
2.0L Turbo
 
Fav Mod: turrrrrbbbbooooo
Join Date: Aug 2012
Location: Burien, WA
Trader Rating: (0)
Posts: 1,126
Default

Is the "manual mode" pin of the auto ecm grounded?
__________________
2001 STM AutoMagic - boost for as long as I keep my foot down
silverton is offline   Reply With Quote
Old 06-13-2019, 10:57 AM   #15
yarrgh
3.3L
 
Car: Black 2001 RS
Fav Mod: larger rear brakes
Join Date: Feb 2005
Location: Denver
Trader Rating: (0)
Posts: 781
Default

I've seen a similar issue when the switch in the transmission for neutral was faulty. The ECU didn't quite know when to engage its idle control. The clutch switch worked, so when the clutch was in, it knew to idle the engine, but when the clutch was out and trans in neutral, it sometimes had a hard time. Might also try testing that switch.
__________________
Who is John Galt?
yarrgh is offline   Reply With Quote
Old 06-13-2019, 11:11 AM   #16
AndrewB23
1.8L
 
Car: 1998 Impreza 2.5rs
Join Date: Feb 2019
Trader Rating: (0)
Posts: 32
Default

The pin is grounded, as I recall when I didn't have it grounded on accident it threw a code for the trans. I never had this stalling issue when the previous owner had the heads out of whack, now that everything seems to be right it's stalling. I'm pretty sure it might be the IACV like previously stated I'm hoping to be going to pick a used one up today or try and clean mine.
AndrewB23 is offline   Reply With Quote
Old 06-14-2019, 04:56 PM   #17
AndrewB23
1.8L
 
Car: 1998 Impreza 2.5rs
Join Date: Feb 2019
Trader Rating: (0)
Posts: 32
Default

Welp tried cleaning my IACV and putting on a different one still stalls but doesn't seem as bad could also be that I'm looking for it now. Also now it only stalls under heavy braking, tomorrow I'll go through all the wiring and grounds again and everything else.
AndrewB23 is offline   Reply With Quote
Old 06-14-2019, 09:40 PM   #18
AndrewB23
1.8L
 
Car: 1998 Impreza 2.5rs
Join Date: Feb 2019
Trader Rating: (0)
Posts: 32
Default Solved:Car dies randomly and under heavy braking

Thank you to everyone for the help and advicereally helped me figure this out and shocker the previous owner messed up the ground for the ecu when he manual swapped it. He put a connecter on the pin and it was too big to fully fit in the harness. So I pulled a the ground wire from a spare manual forester harnes I have( by the way, might be obvious to some but you can't use a forester harness on a 2.5 rs) to ground the pin and now it drives perfect, doesn't even drop past 700rpm. I can hopefully finally just drive it, and enjoy the 11:1 compression of the hybrid built engine.
AndrewB23 is offline   Reply With Quote
Old 06-17-2019, 10:38 AM   #19
yarrgh
3.3L
 
Car: Black 2001 RS
Fav Mod: larger rear brakes
Join Date: Feb 2005
Location: Denver
Trader Rating: (0)
Posts: 781
Default

Good to hear you solved it. Thx for following up w/the solution.
__________________
Who is John Galt?
yarrgh is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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


All times are GMT -7. The time now is 01:35 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright © 2019 VerticalScope Inc.
Designed & Powered by Domain Architect