Engine NEED HELP - Roughness Cylinder 3 - Subaru Impreza WRX STI Forums: IWSTI.com
STI Forum
Join
Start New Thread Create Account Advertise FAQ Members List Contact
NEED HELP - Roughness Cylinder 3
NEED HELP - Roughness Cylinder 3
Go Back   STI Forums > > > Engine NEED HELP - Roughness Cylinder 3
Reply
 
Thread Tools
Old 05-21-19, 09:52 PM   #1
jharobikesr2
Becoming A Contributor
Feedback Score: 0 reviews
 
Car: DGM 2019 STi
Fav Mod: Boooooost... right?
My Threads
Posts: 19
My Subaru Parts for sale

Join Date: Sep 2016
Location: Denver CO
jharobikesr2 is an unknown quantity at this point
Default NEED HELP - Roughness Cylinder 3

Hey guys, I'm at a wits end chasing an issue. I need some feedback.

I recently install and bunch of parts on my 2019 STI ( 12k miles... ) Everything was brand new in the box..

IAG AOS (Street)
Cobb Intake
Perrin Turbo Inlet
FP Blue Turbo
Grimspeed EBCS
Grimspeed up pipe with 38mm tial ewg
HKS SSQV
Cobb Stumble kit
1050x injectors ( Stock Rails and lines )
AEM 340lph FP
ETS TMIC
Invidia Catless DP
Invidia R400

Anywho, I am getting a weird stutter around idle to 2000 rpm or so and my cyl3 is showing roughness up to 14.... All the other cylinders are showing 0 and if anything maybe 1 if I shift bad or aggressive... I have had the car tuned twice now.. two different tuners and both are having the same issue with this cyl3 roughness.

Running approx. 20psi for now 330whp/380wtq mustang dyno.. nothing insane for now until I get the flex fuel kit installed then we are trying to make around 400whp. I just don't want push the car without fixing this issue first. We all know how Subaru's can be.. Any help would be amazing.
THANK YOUUU!!!!

Any helps would be

Anyone have any ideas on what might be the culprit?
jharobikesr2 is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Old 05-22-19, 04:13 AM   #2
mheyman
Gold Member
Feedback Score: 4 reviews
 
Fav Mod: Camber Camber Camber
My Subaru Parts for sale

Join Date: Feb 2012
Location: SJ USA
mheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of light
Default Re: NEED HELP - Roughness Cylinder 3

look/test for leaks
Check plugs
Swap Coil Packs
Swap injectors

kind of in order of difficulty - but you changed fueling/injectors
__________________
If someone's description of a mod sounds to good to be true, it probably is !!!

If you think you should have lower r's at cruise you're in the wrong car

I become a more loyal IAG customer every time I drive my STI
mheyman is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-22-19, 07:02 AM   #3
Leemanfor
Master Contributor Level 1
Feedback Score: 0 reviews
 
Fav Mod: EFR 7163 Turbo
My Threads
Posts: 788
My Subaru Parts for sale

Join Date: Feb 2015
Location: Lochbuie, CO
Leemanfor has a spectacular aura aboutLeemanfor has a spectacular aura about
Default Re: NEED HELP - Roughness Cylinder 3

like Mheyman said

I'd do a boost leak test first.

what is your DAM/FeedBack knock/FKL when this happens?
What is your AF Learning 1 value?

can you get a video? or if you want to meetup, I can meet you and take a look.
Leemanfor is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Sponsored Links
Advertisement
 
Old 05-23-19, 11:42 AM   #4
jharobikesr2
Becoming A Contributor
Feedback Score: 0 reviews
 
Car: DGM 2019 STi
Fav Mod: Boooooost... right?
My Threads
Posts: 19
My Subaru Parts for sale

Join Date: Sep 2016
Location: Denver CO
jharobikesr2 is an unknown quantity at this point
Default Re: NEED HELP - Roughness Cylinder 3

AF, DAM and FKL learn are all normal.

I am seeing values of up to 20 on cyl 3

No idea... I haven't dug into it yet, I have been working like crazy. It happens at low load rpm and shift points. Under WOT everything is normal.

I did have the vac line on the EWG melt and over boosted like a mother fucker one time 26.8 psi and the car shut it down quick. but the issue was there prior to this.

Everything started after I installed everything, which makes me think it was an injector or something happened to the plug or coil during the first tune which was garbage. I then had it re tuned by another person and everything runs better minus this issue which he tried for a long time to fix. Tip in had no effect on it, which was what I thought was wrong.
jharobikesr2 is offline  
Likes 0 Dislikes 0
 
Reply With Quote
Old 05-24-19, 03:52 AM   #5
mheyman
Gold Member
Feedback Score: 4 reviews
 
Fav Mod: Camber Camber Camber
My Subaru Parts for sale

Join Date: Feb 2012
Location: SJ USA
mheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of lightmheyman is a glorious beacon of light
Default Re: NEED HELP - Roughness Cylinder 3

Quote:
Originally Posted by jharobikesr2 View Post
AF, DAM and FKL learn are all normal.

I am seeing values of up to 20 on cyl 3 . . .

No idea... I haven't dug into it yet, I have been working like crazy. It happens at low load rpm and shift points. Under WOT everything is normal.
From this I would not expect spark related - - - which leaves everything else . . .
__________________
If someone's description of a mod sounds to good to be true, it probably is !!!

If you think you should have lower r's at cruise you're in the wrong car

I become a more loyal IAG customer every time I drive my STI
mheyman 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Florida Storms Causing short-term Cylinder Roughness JConrad 2.5 Liter/Litre Factory Motor 0 06-04-18 01:48 PM
Compression leakdown test, and in Cylinder video! Socko 2.5 Liter/Litre Factory Motor 9 03-27-13 11:50 AM
Accessport cylinder roughness datalog? What is it actually recording? blacknblue06STI ECU Tuning & Performance Electronics 9 02-24-12 09:21 AM
The Shop CT's Street Series Cylinder Head Service The Shop CT GR-Engine, ECU, Power, Drivetrain 1 09-04-11 06:48 AM
OBD-II Codes (CEL Light Codes) 201Motorsports 2.5 Liter/Litre Factory Motor 8 06-03-09 03:19 PM


New To Site? Need Help? More

All times are GMT -8. The time now is 03:00 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.