Evo 8 stutters and goes lean above 20 psi.All of a sudden. - EvolutionM - Mitsubishi Lancer and Lancer Evolution Community



Evo 8 stutters and goes lean above 20 psi.All of a sudden.

Reply
 
 
 
Thread Tools Search this Thread
Old Jan 18, 2018, 06:56 PM   #1
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Angry Evo 8 stutters and goes lean above 20 psi.All of a sudden.

Whats up guys. So all of a sudden my car started acting up on WOT.

Fp red
E85
All supporting mods.


Car went from running great to now when i do wot pulls as soon as i hit 20 psi or so you feel either a studder or misfire. And wideband spikes lean.

Any thoughts? Do the evo 8s have fuel pressure relay issue like x?

If it was a lack of fuel pressure lets say. I dont think it would stutter.

Any thoughts?
Offline
 
Reply With Quote
Old Jan 19, 2018, 10:49 PM   #2
Newbie
 
400s's Avatar
 
Join Date: Mar 2014
Location: C
Posts: 49
Thanks: 0
Thanked 3 Times in 3 Posts

Drives: Evo IX MR

Have you logged this?
Offline
 
Reply With Quote
Old Jan 20, 2018, 08:56 AM   #3
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Yes did a log this morning. I don't see anything that catches my attention in the log.

It all started with my check engine light coming on. For fuel trim code. I had -11.9 fuel trim so I adjusted accordingly. Trims are with in 5 % now and chek engine lamp off.

Still didn't fix issue.

Im beginning to think this is a outside influence such as coils or wires.

I swapped out my plugs also. They weren't brand new but good known units.

I just don't understand if its a misfire or a fuel cut or boost cut.
Offline
 
Reply With Quote
Old Jan 20, 2018, 09:01 AM   #4
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

NOTES:

This vehicle is on speed density Running a OMNI 4 bar and running on fuel temp.

Omni has been replaced with good known unit.

Exhaust cam position sensor has been swapped with good known unit.
Offline
 
Reply With Quote
Old Jan 20, 2018, 09:48 AM   #5
Evolving Member
 
Join Date: Oct 2012
Location: Dubai
Posts: 301
Thanked 3 Times in 3 Posts

Drives: 2006 Evo9 MR

How's the fuel pressure?
Online
 
Reply With Quote
Old Jan 20, 2018, 09:59 AM   #6
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Quote:
Originally Posted by Evo9_Dubai View Post
How's the fuel pressure?
Have not performed fuel pressure test.

Also I can take the car to 6500 rpm part throttle
Offline
 
Reply With Quote
Old Jan 20, 2018, 10:01 AM   #7
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

The condition is pretty violent.

I don't think its a misfire but I may be wrong. Feels like I hit a brick wall.
Offline
 
Reply With Quote
Old Jan 20, 2018, 10:24 AM   #8
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Coil ohm testing

Short SPARK CABLE- 2.794 kOHM
Long SPARK CABLE- 5.66 kOHM

Coil Boot 1.7 OHM
Coil Boot 2 1.0 OHM

Coil 1 10.3 kOHM
Coil 2 9.86 kOHM

Last edited by 4b11slayer; Jan 20, 2018 at 10:53 AM.
Offline
 
Reply With Quote
Old Jan 20, 2018, 10:56 AM   #9
EvoM Guru
iTrader: (8)
 
razorlab's Avatar
 
Join Date: Aug 2003
Location: Alameda, ca
Posts: 10,772
Thanked 180 Times in 162 Posts

Drives: a laptop connected to your ECU.

check to make sure your oem hanger assembly internal filter isn't clogged? When mine clogged it was almost the exact same symptoms. new hanger assembly fixed it all.
Offline
 
Reply With Quote
Old Jan 20, 2018, 11:57 AM   #10
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Quote:
Originally Posted by razorlab View Post
check to make sure your oem hanger assembly internal filter isn't clogged? When mine clogged it was almost the exact same symptoms. new hanger assembly fixed it all.
I Will do that next. It has a walbro 450 in it so I wanted to check make sure its still seating up on the hangar. Any one who as installed one of these knows it has to be ghetto rigged lol

Thanks.


Any other thoughts razorlab?

How can I identify boost or fuel cut? Through a log? Would I see injector duty suddenly get cut? Cause my IDC seems normal.

Also If it is boost cut I would see WGDC get cut?
Offline
 
Reply With Quote
Old Jan 20, 2018, 12:01 PM   #11
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

I just want be clear that this just happened from 1 day to the next.

Went out for a cruise with the boys and felt it on a wot pull. Hour later mil set for fuel trims. Adjusted fuel latency accordingly and fixed the trims. Problem still there. Maybe coincidence.

What other sensors might cause this?
Offline
 
Reply With Quote
Old Jan 20, 2018, 04:04 PM   #12
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

UPDATE: Checked fuel pump assembly for proper pump fitment and also inspected pick up screen. Dirty but not clogged. Cleaned with brake cleaner and air.

Any other thoughts? Im going to Close the spark plug gap down to .020 see if it helps.

Currently running 0.21-0.22
Offline
 
Reply With Quote
Old Jan 20, 2018, 04:36 PM   #13
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Also checked hobbs switch operating normal
Offline
 
Reply With Quote
Old Jan 20, 2018, 04:56 PM   #14
Evolved Member
 
Biggiesacks's Avatar
 
Join Date: Aug 2005
Location: The Bay Area
Posts: 2,424
Thanked 118 Times in 113 Posts

Drives: 2011 Evo MR, 2003 Evo

Is this 91 or e85? If your trims are pulling fuel like you said that would make me think blend change on e85. -11 is pulling alot of fuel, where you able to verify if the ecu was hitting stoich when it was pulling that much fuel? If you change your scaling back to the way it was before compensating for the trims, clear them out by pulling the battery and then testing, does the problem persist?
Offline
 
Reply With Quote
Old Jan 20, 2018, 05:08 PM   #15
Evolved Member
Thread Starter
 
4b11slayer's Avatar
 
Join Date: Nov 2015
Location: Santa Ana
Posts: 1,785
Thanked 81 Times in 81 Posts

Drives: 2004 rs ct9a

Yes e85 here in socal.

So just did a pull in 2nd the break up is less violent now with the plug gap set to 0.19. So maybe my coils are tired?
Offline
 
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2006 Evo 9 stuttering? Kody Mills General Engine Management / Tuning Forum 10 May 13, 2017 01:52 AM
Evo 9 stutters when accelerating Heirthos Evo General 10 May 13, 2017 01:49 AM
96530706 Evo 8 mines5 EcuFlash 9 Aug 24, 2016 06:05 AM
WOT stutter and boost leak test edsct9a Evo General 11 Apr 21, 2016 12:31 PM
Built Motor missfire\stutter problems evl gsr Evo Engine / Turbo / Drivetrain 1 Apr 20, 2016 03:30 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -7. The time now is 10:50 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: