Welcome to the North American Subaru Impreza Owners Club Thursday August 21, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-03-2010, 01:27 AM   #1
Speedwagon
Scooby Specialist
 
Member#: 19681
Join Date: Jun 2002
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
1998 Legacy Wagon GT
Green

Default Impreza is going crazy

1997 Impreza Outback 2.2L 4EAT

Tonight is the second time this has happened to this car. The first time was about 2-3 weeks ago. Both times it was rainy weather.

While driving, the car suddenly starts bucking, RPMs going up and down. At highway speeds, I end up slowing down because of this(the engine can't keep it at highway speeds). Both times, I pulled over and the engine stalled. As soon as I restarted, the AT Oil Temp light flashed at me(both times), and the engine stalled again. Eventually, the engine restarted and stayed running. After the first time this happened, the car sat for a few days and then seemed perfectly fine, but it did throw a CEL, which I pulled and it was a MAF code. This time, the CEL isn't on.

From searching, I've run across some threads that indicate the MAF sends some signals to the TCM to control the shifting, which might be why I'm getting the ATOL flashing? Would all this indicate a MAF going bad?
* Registered users of the site do not see these ads.
Speedwagon is offline   Reply With Quote
Old 08-03-2010, 02:03 AM   #2
Back Road Runner
Scooby Guru
 
Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
Vehicle:
2004 Forester STI
Silver

Default

Old car, first check for corrosion. Clean up the battery connections, all the main grounds, and look for corrosion elsewhere. For example, when I got corrosion on my + terminal on the battery, I saw just as much corrosion build up on the knock sensor...which eventually malfunctioned.

The MAF is an obvious problem and will cause major running issues like you see. Just because it isn't throwing a code doesn't mean it is working properly. Clean the MAF.

A secondary main sensor used to control car operation is the air/fuel sensor in the exhaust before the cats. This is another one of those sensors that as it goes bad it starts causing some pretty crapping running.

Both of these sensors won't immediately throw codes. Typically the car will be running pretty darn bad as you've found out before you really even get a code to show up. I just tossed in the air/fuel as sort of a watch item. Your car's been using it for quite a while and it's one of those that will eventually start fouling out, especially if you're starting to burn some oil. It's not a sensor I feel is actually your problem right now. I'm just tossing it out there as one to look at in the future when the car starts to act goofy in a different way.
Back Road Runner is offline   Reply With Quote
Old 08-03-2010, 10:09 AM   #3
yellowrs
Scooby Newbie
 
Member#: 211754
Join Date: May 2009
Chapter/Region: Tri-State
Location: nazareth,pa
Vehicle:
1995 impreza 2.2L
sunburst yellow

Default

check and make sure there is no water getting into the air filter my car did what ur saying it would buck and feel like its dieing and then if you stoped it would die but it would only happen when it rained
yellowrs is offline   Reply With Quote
Old 08-03-2010, 11:37 AM   #4
Qman
Scooby Specialist
 
Member#: 964
Join Date: Feb 2000
Chapter/Region: NWIC
Location: Bonney Lake, Wash. USA
Vehicle:
'95 work in
progress

Default

I second the MAF. Clean first, replace second!
Qman is offline   Reply With Quote
Old 08-04-2010, 09:38 PM   #5
Speedwagon
Scooby Specialist
 
Member#: 19681
Join Date: Jun 2002
Chapter/Region: RMIC
Location: Denver, CO
Vehicle:
1998 Legacy Wagon GT
Green

Default

Thanx for the advice!
Speedwagon is offline   Reply With Quote
Old 08-05-2010, 07:10 PM   #6
RaceFaceXC
NASIOC Supporter
 
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: stupid Florida
Vehicle:
2007 No YELLING
on the bus!

Default

First, chk the connectors for the MAF and O2 sensors for damage, corrosion and moisture. If it only happens when it rains, it may be some water causing problems in the connectors. This would be the easiet thing to do, may be free to fix and would save you lots $ if you dont have to replace any parts. Wouldnt hurt to spray some moister repellent on the connectors, too. like WD-40 or Corrosion X or silicone dielectric grease. If you use something else, make sure its safe for electrical connections.
RaceFaceXC is offline   Reply With Quote
Reply

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
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
my cable modem is going CRAZY! nhluhr Off-Topic 12 07-11-2004 02:31 PM
my automatic WRX is going crazy brian1wrx Transmission (AT/MT) & Driveline 21 06-17-2004 11:08 AM
Help!, My wastegate is going CRAZY! mrubino83 Factory 2.0L Turbo Powertrain 3 06-11-2004 06:22 AM
AIM is going crazy.... 2k2 Off-Topic 21 05-09-2004 09:52 AM
Knocklink is going crazy with tune, i think its a pos Turbo Tin Can Factory 2.0L Turbo Powertrain 55 07-17-2002 07:10 PM


All times are GMT -4. The time now is 09:02 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.