Perth-WRX.com  

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

ULTREX
Welcome to Perth-WRX, click here to register!

Like Tree1Likes
  • 1 Post By Wildslide

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 27-08-2015, 03:18 PM
Scoobie Noobie
Member
 
Join Date: Jul 2015
Location: Mt Barker
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Wildslide at standard level
Default 95 gc8 jerking under boost

Hi all. I just started having an issue with my 95 wrx. Its been chipped and running a td05 turbo has a 3 inch cat back other than that its stock. Under load it has started jerking. It doesnt happen at the same revs or speeds. But it only happens under boost. Its a complete loss of power like the ignition has been turned off. It only hapens for a second then comes back. Sometimes it does it repeatedly other times only once or twice.The tacho doesnt react andno check engine light. If I'm just drivung normally around town it doesnt do it at all. Just when the throttle is wide open and coming on boost. I replaced the fuel filter and gace it a good squirt of decarbonizer and it seemed to help. But its still doing it. I've gone over all the vacuum hoses. I've even disconected the factory solenoid and put in a boost t. Running lower boost than the tune has been has also seemed to make a difference. I'm thinking that the fuel pump may not be delivering enough pressure. But as I know next to nothing about turbos. WRXs, in particular. I thought Id see if anyone else has had this issue.
using the Perth-WRX mobile app
Reply With Quote
  #2  
Old 27-08-2015, 04:00 PM
Jezza's Avatar
Flat Four Father
Member
 
Join Date: Oct 2008
Location: Swan Valley
Posts: 2,306
Thanks: 20
Thanked 33 Times in 25 Posts
Jezza at standard level
Default

AFM... this happened to me once also.


Also worth checking spark plugs and leads.
Reply With Quote
  #3  
Old 27-08-2015, 05:02 PM
matto20v's Avatar
STI Master
Member
 
Join Date: Jul 2005
Location: Perth
Posts: 963
Thanks: 37
Thanked 34 Times in 31 Posts
matto20v at standard level
Default

I also think its AFM. Try cleaning it with some cleaner, and if it fixes it, invest in a new AFM as cleaning it seems to be only a short term problem and the problem is likely to return.

I only skimmed over your post, but have you tried resetting the ECU? Disconnect the battery for 15 minutes or so is the easiest way.
Reply With Quote
  #4  
Old 27-08-2015, 05:35 PM
Scoobie Noobie
Member
 
Join Date: Jul 2015
Location: Mt Barker
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Wildslide at standard level
Default

Ill get some afm cleaner tomorrow. Did have some but as with alot of things I have no idea where I put it or if I used it up. Haven't reset the ecu yet. Plugs should be fun I have to do the rocker gaskets anyway. Its still got individual coil packs. Have the bits to do the conversion just havent got around to it yet. Probably do it at the same time as gaskets. Put in new plugs at the same time.

using the Perth-WRX mobile app
Reply With Quote
  #5  
Old 28-08-2015, 03:39 PM
Scoobie Noobie
Member
 
Join Date: Jul 2015
Location: Mt Barker
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Wildslide at standard level
Default

Well cleaning the afm didn't work. It did need cleaning but its not what is causing the problem. I'm starting to.think one of the coil packs is breaking down. So I guess I'll pull them and have a look.

using the Perth-WRX mobile app
Reply With Quote
  #6  
Old 28-08-2015, 05:24 PM
Insome's Avatar
Sir AntiLag
Member
 
Join Date: Oct 2009
Location: Perth
Posts: 349
Thanks: 5
Thanked 13 Times in 11 Posts
Insome at standard level
Default

Plugs and leads. This was the problem with a GC8 I had ages ago. Changed the plugs and leads and no more problems.
Reply With Quote
  #7  
Old 28-08-2015, 05:29 PM
Scoobie Noobie
Member
 
Join Date: Jul 2015
Location: Mt Barker
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Wildslide at standard level
Default

Going to put in new plugs and add leads. Its got a coilpack for every plug. I have a coil pack the same as my 96 had. So I hope the conversion isn't to much of a hassle just wanting to sell this car at the moment and concentrate on my 2000. It doesn't play up at all on 3/4 throttle. Its driving me a bit nuts. As it didn't play up at all until someone came to take it for a test drive. I felt like such a dodgy salesman saying "its never done that before".

using the Perth-WRX mobile app
Reply With Quote
  #8  
Old 31-08-2015, 11:05 AM
Scoobie Noobie
Member
 
Join Date: Jul 2015
Location: Mt Barker
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Wildslide at standard level
Default

Went over all the vacuum hoses going to the boost sensor. Found 2 that were a bit loose and the line to the wastegate looked perished. Fixed the leaks. Replaced the wastegate actuator hose with some new fuel hose. And BINGO. Goes hard again. Haha only took days n days of it doing my head in.

using the Perth-WRX mobile app
AWDmoke likes this.
Reply With Quote
Reply

Tags
95, boost, gc8, jerking

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
GC8 Greddy Boost issue wrxnewbie Mechanicals 0 22-11-2012 04:14 PM
FS: Rays Stark M's Wheels, GC8 Sti Taillights and Defi Racer Boost Gauge GR-34-DY For Sale 4 15-11-2012 07:13 PM
grimmspeed boost controller for gc8 peppe Wanted 1 18-04-2011 08:27 PM
WTB: GC8 clutch master and slave suit 95 wrx doadrift Wanted 2 20-06-2008 08:41 AM
What Boost Controller To Go For? awd_wrx Mechanicals 9 11-09-2006 11:58 PM



Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 09:01 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO