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 09-12-2007, 12:39 PM
Ricochet's Avatar
Ricochet Ricochet is offline
I brought some ham.
 
Join Date: Jul 2005
Location: Columbus OH
Posts: 1,868
Send a message via AIM to Ricochet Send a message via MSN to Ricochet Send a message via Yahoo to Ricochet
Idling like an F1 car

wow this just popped up out of nowhere.. my car idles around 1500 rpms now. I've also had a weird hesitation problem for a while, could the iac be causing this? Any way to test it? I don't even know where it's located..
__________________
Brian
Reply With Quote
  #2  
Old 09-12-2007, 01:01 PM
JaySVX's Avatar
JaySVX JaySVX is offline
Bad decisions effect everybody
 
Join Date: Mar 2007
Location: Collegeville, PA
Posts: 1,902
Send a message via AIM to JaySVX Send a message via Yahoo to JaySVX
You mean the 1500rpm idle like when the car first starts up? Normal operation is cold start, idle at 1500rpm until at standard temp, then it drops to 300-400. I would check your TPS voltage, make sure it's as close to .5v as possible.
__________________
*No SVX at the moment...*
1987 Winnebago Elandan 35'
2001 Yamaha Roadstar 1600
2004 Ford Excursion Eddie Bauer, 6.0litre Power Stroke Diesel - Daily Driver.


Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well-preserved body, but rather to skid in sideways, scotch in one hand, body thoroughly used up, totally worn out and screaming HOOOOYA !!!!!
Reply With Quote
  #3  
Old 09-12-2007, 01:04 PM
processengr's Avatar
processengr processengr is offline
Registered User
Subaru Silver Contributor
 
Join Date: Feb 2007
Location: Conn.
Posts: 767
Registered SVX
If you shut it off, then restart it, does the idle correct itself?
If so, then it is likely the TPS
__________________
Cheers! Gordon
1997 Ebony #308 113k "The Black Diva"SOLD
1992 Black over Liquid Silver 152k SOLD
1992 Ebony 251k 444 SOLD
1999 Silver SLK230 134k SOLD
1997 Green Outback 137k SOLD
2013 Honda Accord I4 SOLD
2015 Subaru Crosstrek 30k
2018 Tesla M3 30k
Reply With Quote
  #4  
Old 09-12-2007, 01:21 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
TPS....no doubt about it
__________________
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 09-12-2007, 01:52 PM
Ricochet's Avatar
Ricochet Ricochet is offline
I brought some ham.
 
Join Date: Jul 2005
Location: Columbus OH
Posts: 1,868
Send a message via AIM to Ricochet Send a message via MSN to Ricochet Send a message via Yahoo to Ricochet
but how does the tps go bad it's mechanical, I've torn it open before and there's nothing to it.
It idles like that warm and cold.
__________________
Brian
Reply With Quote
  #6  
Old 09-12-2007, 02:12 PM
wannarace928's Avatar
wannarace928 wannarace928 is offline
Registered User
 
Join Date: Aug 2006
Location: Ohio
Posts: 454
Send a message via AIM to wannarace928 Send a message via Yahoo to wannarace928
Classic SVX
Any check engine light codes?
Sounds more like something is sticking.
You can try cleaning the tps.
__________________
1992 Subaru SVX 5spd
1998 Pontiac Firebird Formula
1999 Chevrolet Camaro SS
2009 Subaru Forester - Mileage Junky
2009 Pontiac G8 GT
2017 Ford Mustang GT 6spd
Reply With Quote
  #7  
Old 09-12-2007, 02:30 PM
Guyver280z's Avatar
Guyver280z Guyver280z is offline
Registered User
 
Join Date: Apr 2007
Location: Tempe, AZ
Posts: 232
Send a message via MSN to Guyver280z
Same problem... well, mine sticks at 2,000 sometimes a little over, and it takes like forever to come down to 900, but if I gitve it some gas it will go up again.... plus I still have that rough running issue
Reply With Quote
  #8  
Old 09-12-2007, 03:16 PM
Ricochet's Avatar
Ricochet Ricochet is offline
I brought some ham.
 
Join Date: Jul 2005
Location: Columbus OH
Posts: 1,868
Send a message via AIM to Ricochet Send a message via MSN to Ricochet Send a message via Yahoo to Ricochet
check engine light comes on sometimes when I first start the car.. then it'll be gone for days at a time. Maybe I'll hookup with budfreak sometime, he's around this neck of the woods..
__________________
Brian
Reply With Quote
  #9  
Old 09-12-2007, 03:25 PM
Hocrest's Avatar
Hocrest Hocrest is offline
Freezepop's are Awesome!!!!
Subaru Silver Contributor
 
Join Date: Oct 2003
Location: Pittston, PA
Posts: 5,334
Send a message via AIM to Hocrest
Quote:
Originally Posted by Ricochet View Post
but how does the tps go bad it's mechanical, I've torn it open before and there's nothing to it.
It idles like that warm and cold.
The contacts corrode and get crud on them, thus they don't read the proper resistance along the entire path.

If you've had it apart before, do it again and use some good electrical contact cleaner.
__________________
Dave
- 03 Baja - 92 SVX - 86 Brat - 08 OB 3.0
Reply With Quote
  #10  
Old 09-12-2007, 03:30 PM
Ricochet's Avatar
Ricochet Ricochet is offline
I brought some ham.
 
Join Date: Jul 2005
Location: Columbus OH
Posts: 1,868
Send a message via AIM to Ricochet Send a message via MSN to Ricochet Send a message via Yahoo to Ricochet
It actually looked brand new when I looked at it last time, about 5 months ago..
__________________
Brian
Reply With Quote
  #11  
Old 09-12-2007, 06:22 PM
Trevor's Avatar
Trevor Trevor is offline
Registered User
 
Join Date: Feb 2002
Location: Auckland, New Zealand
Posts: 5,223
Registered SVX
The throttles are shut at idle and the required air is supplied via a separate circuit. When the engine is idling the throttles are bypassed via an idle air circuit. Provided the TPS is delivering the correct signal voltage, (0.5 volts) when the throttles are shut, and they are mechanically shut, there can be no adverse affects. This can be simply tested, as per my advice included within the how too stuff.

When the engine is cold, idle air is provided via the by-pass air control solenoid valve, together with the auxiliary air control valve. The latter is directly temperature operated and should shut as the engine warms up. The solenoid valve is controlled via a signal from the ECU, which depends on several sensors for the required information in order to set the idle speed for various conditions, when the engine is at normal running temperature.

A diagnostic check should show up any of several possible faults, with the exception of the auxiliary air control valve, which is a very likely culprit. If this does not shut when the engine becomes warm, idle speed will be excessive, as is the exact symptom reported. N.B. There is a constant 12 volt supply to this valve, even though it is not involved with the TCU.

An air leak post throttles, could also cause the problem. There have been reports of loose manifold bolts. However in view of temperature being a reported factor, this is a less likely cause.

I hope this screed may be of some assistance.
__________________
Trevor, New Zealand.

As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit!
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 01:29 PM.


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