The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:

Go Back   The Subaru SVX World Network > SVX Main Forums > Technical Q & A

Reply
 
Thread Tools Display Modes
  #1  
Old 10-23-2004, 08:22 PM
Htownsvx Htownsvx is offline
Registered User
 
Join Date: Oct 2004
Location: houston
Posts: 149
Send a message via Yahoo to Htownsvx
Lightbulb engine truoble

i just got a new tranny in my car and when it back i was having idaling proble it would jump form 400 rpm to almost 800 rpm. and when i give it gas it is really slow to acc. until it hit 3000rmp and then it take off like normal. and when i turn the a/c is on the problem is worse. i have change the oil, filter and the plug and the check engine light never come on.

does this sound like a ecu problem.
or could it have any thing to do with my two front bad cats?
Reply With Quote
  #2  
Old 10-23-2004, 08:58 PM
Phoenix_3737's Avatar
Phoenix_3737 Phoenix_3737 is offline
Registered User
 
Join Date: Aug 2004
Location: Laredo Tx
Posts: 454
to me it sound like an ecu problem...i know my dads truck did this on his OBDII but i dont know what he did to fix it....

by the way im from L-town (laredo) heh welcome to the forum (even though youve posted 3 times)
__________________
1994 Pearl LS Black top ( The Penguin)
"was" The only man alive who drives a "Suba SSV".......according to my insurance company

***sold***

"was" The Only Subaru Svx Owner in Laredo Tx., or maybe atleast only owner registered here....

http://www.cardomain.com/id/phoenix_3737
Reply With Quote
  #3  
Old 10-24-2004, 10:26 AM
Htownsvx Htownsvx is offline
Registered User
 
Join Date: Oct 2004
Location: houston
Posts: 149
Send a message via Yahoo to Htownsvx
i was reading online somewhere this compony had a stage 1, 2 and 3 ecu. if i were to get say the stage 2 you think this could fix the problems
Reply With Quote
  #4  
Old 10-24-2004, 10:36 AM
n00b on demand's Avatar
n00b on demand n00b on demand is offline
OMGWTFBBQ!!1!11!LMAOROFLC OPTER
 
Join Date: Apr 2004
Location: New York City
Posts: 5,114
what yr SVX do you have? The stage 2 setup is with NOS i think.
__________________
1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06)

2006 Subaru Impreza 2.5i....5spd - My daily driver

2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver

2,543 Member of the SVX World Network
Reply With Quote
  #5  
Old 10-24-2004, 06:33 PM
Htownsvx Htownsvx is offline
Registered User
 
Join Date: Oct 2004
Location: houston
Posts: 149
Send a message via Yahoo to Htownsvx
it a 92. i called the place, it is ecutune he told me that the chip would not fix that it sound like a hose to the intake was loose. but i check then all and i took off the trotle body and cleaned it . it seemed to fix the problem for a little and then it came back.
Reply With Quote
  #6  
Old 10-24-2004, 06:56 PM
NiftySVX NiftySVX is offline
Registered User
 
Join Date: Sep 2002
Location: Oklahoma City, Oklahoma
Posts: 836
Send a message via AIM to NiftySVX
Idle speed issue

If cleaning the throttle body helped it some than you may have an IAC (Idle air control) valve problem. Is the problem changed at all by engine coolant temperature?

NiftySVX
__________________
2007 GS 450h-Active Stabilizer/Radar cruise
1994 L Blue 3.70 VTD



ASE Master Automobile
ASE Advanced Level Specialist
Toyota Master Diagnostic Technician (former life)
Reply With Quote
  #7  
Old 10-25-2004, 06:53 AM
Htownsvx Htownsvx is offline
Registered User
 
Join Date: Oct 2004
Location: houston
Posts: 149
Send a message via Yahoo to Htownsvx
no i just had a new radiator put in the car when i had the new tranny put in.
now when i turn i the a/c the car stays at it normal idel at like700rpm. when you turn on the a/c the car is going to boosed the idel to help the a/c right . so the idel should go up alittle like i does on my 01 legacy
Reply With Quote
  #8  
Old 10-25-2004, 07:23 AM
SilverSpear's Avatar
SilverSpear SilverSpear is offline
Still 1.7K to go...
Subaru Silver Contributor
 
Join Date: Oct 2004
Location: Lebanon, Middle East
Posts: 7,563
Send a message via AIM to SilverSpear Send a message via MSN to SilverSpear Send a message via Skype™ to SilverSpear
Registered SVX
that's definitely a spark plug problem, or their wiring, 100% sure !!!!
__________________
Danny

1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon)
1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration
2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection.
Reply With Quote
  #9  
Old 10-25-2004, 08:12 AM
n00b on demand's Avatar
n00b on demand n00b on demand is offline
OMGWTFBBQ!!1!11!LMAOROFLC OPTER
 
Join Date: Apr 2004
Location: New York City
Posts: 5,114
I vote spark plugs. I have an accel problem too and im betting its a spark plug issue.
__________________
1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06)

2006 Subaru Impreza 2.5i....5spd - My daily driver

2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver

2,543 Member of the SVX World Network
Reply With Quote
  #10  
Old 10-25-2004, 05:16 PM
oab_au oab_au is offline
Registered User
Subaru Gold Contributor
 
Join Date: Mar 2001
Location: Coffs Harb, Australia.
Posts: 5,032
Significant Technical Input Registered SVX
I'll go for the Idle air control valve under the throttle body, also.

Harvey.
__________________
One Arm Bloke.
Tell it like it is!

95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels.
97 Liberty GX Auto sedan. 320,000Kls.
04 Liberty 30R Auto Premium. 92.000kls.
Reply With Quote
  #11  
Old 10-25-2004, 05:43 PM
Htownsvx Htownsvx is offline
Registered User
 
Join Date: Oct 2004
Location: houston
Posts: 149
Send a message via Yahoo to Htownsvx
i check the idle control valve. and that looked to be fine. now the spark plug i just changed but i didnt get the kng cause they did not hvae them i so i got the autolight plaluim. when i put them in i check all the ciols and harness with and volt meter they were all good.

you think i could be the ****ty autolight plug they where only like 3.99 got the 9.99 for the kng plug
Reply With Quote
  #12  
Old 10-25-2004, 08:22 PM
n00b on demand's Avatar
n00b on demand n00b on demand is offline
OMGWTFBBQ!!1!11!LMAOROFLC OPTER
 
Join Date: Apr 2004
Location: New York City
Posts: 5,114
I think you mean NGK. Those are the stock plugs.
__________________
1993 25th Anniversary Edition # 156 of 301 ~ 121, 488 miles ( SOLD TO svxfiles 8/6/06)

2006 Subaru Impreza 2.5i....5spd - My daily driver

2006 Subaru Legacy 2.5i -7k miles..Mom's daily driver

2,543 Member of the SVX World Network
Reply With Quote
  #13  
Old 10-26-2004, 12:21 AM
SilverSpear's Avatar
SilverSpear SilverSpear is offline
Still 1.7K to go...
Subaru Silver Contributor
 
Join Date: Oct 2004
Location: Lebanon, Middle East
Posts: 7,563
Send a message via AIM to SilverSpear Send a message via MSN to SilverSpear Send a message via Skype™ to SilverSpear
Registered SVX
it's rather spark plugs wiring, or spark plug themselves, or you have like we say over here a tired engine valve. what are you shocked? a tired engine valve can make this problemin your car. it did in my friend's toyota supra, he changed it and the rpm went back to its norm. first check out the sparks wiring and spark plugs. if the provlem persists, you should take out the whole engine out and change the valve.
__________________
Danny

1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon)
1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration
2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection.
Reply With Quote
  #14  
Old 10-26-2004, 06:46 AM
Htownsvx Htownsvx is offline
Registered User
 
Join Date: Oct 2004
Location: houston
Posts: 149
Send a message via Yahoo to Htownsvx
yes your right NGK.2 YOU SILVERSPREAR i just check them again and the all seem to be fine .really dont think it is a vavle. before i had the tranny work on the car ran like a champion. the a/c was ice cold.
when i get it back i turn on the a/c and it stay at normal idle..... now im i right or my
right that and car with it a/c on will bump the idle up to like 1000rpm not the stock 600 to 700 rpm. to me i think i has to do something with the computer
Reply With Quote
  #15  
Old 10-26-2004, 11:32 AM
Beav's Avatar
Beav Beav is offline
Not as old as Randy
 
Join Date: Nov 2001
Location: Louisville, KY
Posts: 3,883
Significant Technical Input
The computer is probably the single most reliable part on the car. (True for most cars, excepting GM, Mits and some Chryslers.)

Since it didn't have the problem prior to the tranny work it would make sense to check around everything that was changed/disturbed during that process. I'm betting the engine was tilted back far enough for a long enough time that the accumulated oil and crud in the intake oozed its way back into the idle air controller (below the throttle body) and gunked it up. Also clean the t-body as a cruddy throttle plate(s) will drive the computer wiggy between the constantly changing TPS closed throttle reading and the corresponding A/F and MAP changes. A learning computer can only make so many changes over a certain period of time. Since it learns by seeing an unexpected reading from one sensor not in line in reference to other sensors, what happens when more than one sensor goes belly-up at the same time? Which sensor is providing the correct information? This could also result in the computer recalculating the TPS input and causing other driveability concerns- idle, throttle response/lag, shifting, etc.

My humble advice? Pull the dang t-body and IAC off and clean them properly. Don't adjust any throttle screws or you will end up 'adjusted' (not a good thing.) Replace or at least clean the PCV valve and check the condition of all of the breather and vacuum hoses. Don't forget to check the hose under the intake, behind the p/s pump, for the IRIS reservoir. It catches a lot of heat, is small and breaks on its own accord.
__________________
ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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


All times are GMT -6. The time now is 04:43 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
© 2001-2015 SVX World Network
(208)-906-1122