Perth-WRX.com  

Go Back   Perth-WRX.com > General WRXing > General Subaru Discussion
Register Diddy Kart ArticlesAll AlbumsBlogs FAQ Members List Calendar Search Today's Posts Mark Forums Read

Tokyo Motorsports
Welcome to Perth-WRX, click here to register!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 20-10-2011, 08:47 PM
Scoobie Noobie
Member
 
Join Date: Oct 2011
Location: Perth
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Steve Bradfield at standard level
Default engine spluttering

Hi All
Just got a 99 WRX but having a few problems under boost. It has a unichip sti turbo, exhaust etc but breaks down under heavy exceleration..?? With the boost controller unplugged it is fine. It is running 18psi. I got the mass airflow sensor checked and it was fine. Not sure what do do next? Any suggestions? Thanks

Last edited by Steve Bradfield; 20-10-2011 at 09:32 PM.
Reply With Quote
  #2  
Old 20-10-2011, 09:07 PM
BoxerDan's Avatar
WRX Hi Five Club
Member
 
Join Date: Sep 2011
Location: Swan Valley
Posts: 270
Thanks: 11
Thanked 8 Times in 7 Posts
BoxerDan at standard level
Default

Sounds like you need a tune!
Reply With Quote
  #3  
Old 20-10-2011, 09:23 PM
Kato's Avatar
Burnout!
Member
 
Join Date: Jul 2005
Location: Pimp Corner
Posts: 7,099
Thanks: 7
Thanked 120 Times in 75 Posts
Kato is a guruKato is a guru
Default

Biggest issue is probably the unichip or you are hitting boost cut.

Best to take it to a workshop to diagnose.
__________________
[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]
Reply With Quote
  #4  
Old 20-10-2011, 09:47 PM
mao's Avatar
mao mao is offline
Flat Four Father
Member
 
Join Date: Apr 2011
Location: Salter Point Western Australia
Posts: 2,036
Thanks: 3
Thanked 7 Times in 7 Posts
mao at standard level
Default

Check the hose connections from the boost solenoid to the pressure side and turbo actuator. Also make sure the hose with the built-in factory restrictor is still there.
Reply With Quote
  #5  
Old 20-10-2011, 09:58 PM
Scoobie Noobie
Member
 
Join Date: Oct 2011
Location: Perth
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
Steve Bradfield at standard level
Default

Ok thanks for that. The other weird thing also when driving normal under some exceleration you can feel the car surging slowly up and down at tad.
It does feel like it could be something simple so I will check on those hoses as you mentioned. Cheers
Reply With Quote
  #6  
Old 20-10-2011, 10:07 PM
Mister Two's Avatar
Sleeper Wagon
Member
 
Join Date: Mar 2006
Location: Surface of the Sun
Posts: 4,045
Thanks: 5
Thanked 8 Times in 8 Posts
Mister Two at standard level
Default

Also check Air Flow meter. common problem on my99/00.
__________________
RS Liberty - Because WRX's are only good for parts...
Reply With Quote
  #7  
Old 21-10-2011, 07:39 AM
johnvk7's Avatar
Subaru Tech Division
Member
 
Join Date: Apr 2007
Location: The Noooorth
Posts: 1,212
Thanks: 3
Thanked 12 Times in 9 Posts
johnvk7 at standard level
Default

certainly sounds like AFM, did you replace it with a new one?
Boost cut is pretty aggressive, like hitting a brick wall, is that a good description of what your experiencing?
It may also be a knock sensor problem, if its happening under gentle accel.
Get codes checked bare minimum, and take it easy till you have an answer,
faulty AFM will be leaning out the engine significantly, damage may result.
__________________
Its just the internet dude, its not real.
F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i
Reply With Quote
  #8  
Old 21-10-2011, 07:49 AM
johnvk7's Avatar
Subaru Tech Division
Member
 
Join Date: Apr 2007
Location: The Noooorth
Posts: 1,212
Thanks: 3
Thanked 12 Times in 9 Posts
johnvk7 at standard level
Default

remove unichip, get ECUtek
__________________
Its just the internet dude, its not real.
F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i
Reply With Quote
  #9  
Old 21-10-2011, 08:46 AM
perthzed's Avatar
STI Master
Member
 
Join Date: Nov 2006
Location: XT43's arse
Posts: 525
Thanks: 4
Thanked 7 Times in 4 Posts
perthzed at standard level
Default

Fuel. I had this the other day, engine spluttered and eventually died. Turned out I was low on fuel. I'd say this is your problem.
Reply With Quote
  #10  
Old 21-10-2011, 09:01 AM
Strubaru's Avatar
datto 2600 member
Member
 
Join Date: Aug 2006
Location: the narcotic suite
Posts: 3,516
Thanks: 14
Thanked 39 Times in 38 Posts
Strubaru knows their stuff
Default

replace air flow meter with a brand new one before checking anything else, even after celaning or visual inspection, one that may seem 'ok' can be totally rooted
Reply With Quote
Reply

Tags
engine, spluttering

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Video: Subaru Impreza plus BMW V10 engine equals awesome rss.feed General Subaru Discussion 0 08-09-2011 10:00 AM
Minature Engine mattmy99 Non-WRX Discussion 7 06-07-2011 05:26 PM
How long do you warm your car up for? BALISTC General Subaru Discussion 99 01-09-2010 01:15 PM
USDM Recalled MY08 Forrester FXT and MY08 WRX STI American Dave General Subaru Discussion 53 14-05-2008 06:23 PM
FAQ: Subaru Chasis and Engine Codes pmh Mechanicals 0 10-09-2005 02:34 PM



Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 08:46 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO