Car misfire/stumble when AC on - Subaru Impreza WRX STI Forums: IWSTI.com
STI Forum
Join
Start New Thread Create Account Advertise FAQ Members List Contact
Car misfire/stumble when AC on
Car misfire/stumble when AC on
Go Back   STI Forums > > > Car misfire/stumble when AC on
Reply
 
Thread Tools
Old 06-28-19, 08:55 AM   #1
braticus
Becoming A Contributor
Feedback Score: 0 reviews
 
Car: 03 WRX, 08 STi
Fav Mod: Machine guns
My Threads
Posts: 18
My Subaru Parts for sale

Join Date: Feb 2009
Location: Boston
braticus is an unknown quantity at this point
Default Car misfire/stumble when AC on

Hello,

I tried searching for this, but couldn't find much info. I have a 2008 STi, fully built/tuned making ~400hp. I almost never use the AC, so I never noticed this before. However, yesterday I had the AC on and under WOT the car misfires/stumbles really bad, it scared the shit out of me it was so bad. With the AC off it pulls perfectly, no issues at all. The compressor is only a couple years old, blows cold, and doesn't make any abnormal sounds.

I moved recently and now I'm pretty far away from my tuner, so I'm trying to figure this out on my own. The car acts totally normal when the AC is on under normal driving conditions. WOT is when the issues happen. I have read the some tuners disable the AC on these cars, and they're not able to go WOT with that much HP when the AC is on, but I haven't read anything concrete regarding that.

I recently replaced the plugs and alternator. I tested the battery, looks fine.

Any suggestions are appreciated.

-Thank you

Last edited by braticus; 06-28-19 at 08:58 AM.
braticus is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Old 06-30-19, 03:01 PM   #2
RocketRobin
Platinum Member
Feedback Score: 0 reviews
 
Car: British Racing Green
Fav Mod: Snow Tires
My Threads
Posts: 185
My Subaru Parts for sale

Join Date: Sep 2008
Location: Calgary
RocketRobin is on a distinguished road
Default Re: Car misfire/stumble when AC on

Keep an eye on your manifold temps.
AC can add up to 35,000BTU/Hr to your engine bay.
Turn off AC before WFO throttle.
RocketRobin is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 07-01-19, 09:25 AM   #3
Noximus
Advanced Mastery Level II
Feedback Score: 3 reviews
 
Fav Mod: 2015 STI Steering Rack!
My Subaru Parts for sale

Join Date: May 2013
Location: Canada eh?
Noximus is a glorious beacon of lightNoximus is a glorious beacon of lightNoximus is a glorious beacon of lightNoximus is a glorious beacon of lightNoximus is a glorious beacon of light
Default Re: Car misfire/stumble when AC on

It needs to be tuned for AC use
Noximus is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools

Posting Rules
You may post new threads
You may 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


New To Site? Need Help? More

All times are GMT -8. The time now is 09:29 AM.


Powered by vBulletin
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Designed & Powered by Domain Architect
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.