Welcome to the North American Subaru Impreza Owners Club Saturday July 26, 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 > Service & Maintenance

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 12-27-2004, 02:25 AM   #1
xtorted-legacy
Scooby Newbie
 
Member#: 19568
Join Date: Jun 2002
Location: NJ
Vehicle:
1995 Impreza L
Brilliant Red

Default rough idle, banging, surging, etc etc.

sorry for the cross post from another forum, but i need my car for work and school so i need some help to resolve my current predictament.

"the first real snow of the year and my car decideds to start acting up. So i started driving my g/f home tonight with my bro in the car. I get up to the top of my street and stop at the stop sign. All of a sudden, a really rough idle over takes the car. Note, this car has been running like a top since i got it...and has always idled smooth as butter. So i am going and around 1500rpm i get a constant shake/misfire, but doesnt seem to get anyworse/more noticable as the rpms increase. So i get to my g'fs house and pop the hood, and the car is surging at idle about 200-400 rpm surges...no ticking/no vacume leaks, nothing notciable. We head to the tail pipe and it is definetly notice in the exhuast note/pulses that something is not right. Mind you its 12:50am and its snowing out. so i get in, seeing as i can't do anything there, and head home. About 5 blocks from my house, still discourgaed by my cars recent behavior, open the throttle up to about 3500rpm...if i do it with wot(reving it) it emmits a extremely loud pop/bang from the passenger side of the engine bay. So i pull over into a parking lot about 3 blocks from my house and have my bro lightly rev it to about 2000rpms or so for a quick second and its popping/bangin(enough to scare the **** out of me). In the car it sounded like a bang and i thought it was my bad axle acting up, but standing outside and listening as it is reved lightly in neutral, its a bang/backfire of some sort...but as it revs...not as it revs down.

Not only that, but i got in a reved it alittle in the parking lot and when i completely let off the gas the car remainded reving @ 2000rpm until i reved it to 2500 and let of abruptly.

WHat the hell could it be. No CELS!!!!!!!! No fluids leaking. I just put a new air filter in, changed the oil about a week ago. Ihave new plugs and a new fuel filter about to go in sometime in the next few days.

i seem to think its electrical, plugs, plug wires, coil pack, 02 sensor, maf. One of those.

My bro seems to think i have an exhaust leak, burned out cat, cloge of some sort in my exhuast system. I havent gotten under the car yet but am goign to investigate tomorow morning in the sunlight.

I am just sad cause it was the first snow and i wanted to frolic in it with my car, but ofcourse it starts to buck and misfire like a bitch for the first time ever.

Btw, its a 2.2L n/a in my 1995 L with an 4eat.


And my post after i went out and checked somethings out better right after the original post.

"update: went out right after i posted and checked my plugs. They looked pretty clean but looked like they had the 6k miles on them that they do. The front passenger plug had a bit of liquidy brown around the outside of the plug(on top where you place the sparkplug socket). Possibly a valve cover leak or maybe a head gasket?) I dunno. Tomorow i am gonna pick up a set of plug wires and gap/put in my new plugs and start her up. If she still acts up and or the brown liquid/fluid comes back, i am gonna have to go to the next step.

Someone please lead me ina possible direction. Are my assuptions somewhat correct or am i just jergin it"

any thoughts.
* Registered users of the site do not see these ads.
xtorted-legacy is offline   Reply With Quote
Old 12-27-2004, 02:41 AM   #2
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

...is the airbox closed properly...???
Uncle Scotty is offline   Reply With Quote
Old 12-27-2004, 04:08 AM   #3
xtorted-legacy
Scooby Newbie
 
Member#: 19568
Join Date: Jun 2002
Location: NJ
Vehicle:
1995 Impreza L
Brilliant Red

Default

yes um. but even so, what difference would that make? It still has air to pass over the maf...and my air box is before the maf, so any air would be counted, no?
xtorted-legacy is offline   Reply With Quote
Old 12-28-2004, 12:55 PM   #4
xtorted-legacy
Scooby Newbie
 
Member#: 19568
Join Date: Jun 2002
Location: NJ
Vehicle:
1995 Impreza L
Brilliant Red

Default

bump
xtorted-legacy is offline   Reply With Quote
Old 01-02-2005, 10:57 AM   #5
ImprezaVA
Scooby Specialist
 
Member#: 32846
Join Date: Feb 2003
Chapter/Region: MAIC
Location: Elkton, VA
Vehicle:
1998 Impreza L-SOLD
Arcadia Green

Default

Leaking valve covers shouldn't cause your car to surge, pop, and bang. Also, a clogged catalytic converter will badly bog the engine down, slam your gas mileage, and more than likely glow red after the engine has warmed up.

Quote:
it emmits a extremely loud pop/bang from the passenger side of the engine bay
This is what stumps me. It sounds like a misfire, but you would obviously get a CEL from that.

Spark plug wires?
Cracked Exhaust Manifold or loose header bolt?

-Charles-
ImprezaVA is offline   Reply With Quote
Old 01-02-2005, 03:13 PM   #6
pityr
Scooby Specialist
 
Member#: 31719
Join Date: Jan 2003
Chapter/Region: NWIC
Location: Portland
Default

could be water in the fuel. Get a $2 bottle of HEAT and follow its instructions.

My car freaks out similar to what you describe sometimes after I go up to the mountian for snowboarding. its just condesation in the tank. Not quite as bad though


also check the crank position sensor...if you have one.
pityr is offline   Reply With Quote
Old 01-02-2005, 09:31 PM   #7
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

Sparkplug lose???
Uncle Scotty is offline   Reply With Quote
Old 01-06-2005, 12:50 PM   #8
96GreenLX
Scooby Newbie
 
Member#: 60073
Join Date: Apr 2004
Vehicle:
1996 Impreza LX
Green

Default

Could it have been when you changed the air filter that a pipe got disconected to the intake pipping? This happen to me when I changed my air filter though my car just shut off, but maybe the other pipe is lose of off. I know it's not the same car however my buddy when he owned a Tempo wanted to make a CIA so we did though his box was connected to all the pipping with out using the filter so we left them hang lose and once he reved his car up with the home made CIA it would make the loud banging noises.

Anyway what rpm should the EJ22 idle at? Mine seems to idle kinda low but doesn't jump or anything and seems to run just fine, it idles at the mark below the 1K rpm mark.
96GreenLX 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
Lean/Rough Idle and Compressor Surge after EWG Install RicersWetDream Factory 2.5L Turbo Powertrain 0 05-18-2010 11:38 AM
Rough idle, intermitent and rough cold starts... carter_wrx Pre-2002 Factory Turbo Powertrain 26 10-28-2009 01:03 PM
How Rough is a Rough Idle Go350zGo Factory 2.5L Turbo Powertrain 11 10-22-2009 11:28 PM
High Idle, Rough Idle? Brettweiser Factory 2.5L Turbo Powertrain 3 04-09-2007 11:10 PM
Sudden Rough Idle, CELs, etc... Out of Town, help please scaryfastskier Factory 2.0L Turbo Powertrain 9 09-19-2004 03:57 PM


All times are GMT -4. The time now is 03:52 AM.


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.