Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V  1 2 >  
 Reply to this topicStart new topic
> Idle problems, I know you know!!!
BahnBrenner914
post Jul 27 2005, 10:00 PM
Post #1


The girl is gone and all I have now is a beat-up teener
**

Group: Members
Posts: 301
Joined: 22-May 04
From: Gig Harbor and University Place, WA :: School in Angola, IN :: girlfriend in Sarasota, FL
Member No.: 2,094
Region Association: None
So the ongoing project has been restarted after a 3 month break... no comment... and i fired the car up again and it starts and runs and isnt hunting much... the problem is that it idles at 1500 when i fire it up and then it slowly (really SLOWLY, like 30 seconds) climbs up to 2000 and i dont know if it will climb higher (i'll post a comment when i let it run longer tonight). I know 99% of you all have dealt with this, so help me go from (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) to (IMG:http://www.914world.com/bbs2/html/emoticons/driving-girl.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jul 27 2005, 11:10 PM
Post #2


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
check to make sure the vacuum hoses are connected correctly and check for vacuum leaks.
If the AAR valve is working it will start out with a 1500-1800 idle then after 5 minutes drop down to whatever you idle is set to.

To check to vacuum leaks plug the AAR valve hose so it can't leak and then you can look for other leaks.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rand
post Jul 27 2005, 11:49 PM
Post #3


Cross Member
*****

Group: Members
Posts: 7,409
Joined: 8-February 05
From: OR
Member No.: 3,573
Region Association: None
Mine also idles faster after warmed up, and it's been a hair-pulling battle.

If the AAR valve is NOT working, it should fail closed, right? Meaning opposite behavior of what we are experiencing... It should open when cold, then close down as it warms up. It should feed extra air into the intake when it's cold, and therefor idle faster when cold and slow down as it warms up. So a bad AAR would mean when cold it might idle slower or need some gas pedal feathering until it warms up, but not idle faster when warm.

Fast idle usually means vacuum leak (or improperly connected vacuum hoses) or too-advanced timing. But I still haven't figured out how temperature plays into this yet, especially when it idles faster after warm.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 28 2005, 12:39 AM
Post #4


914 Idiot
***************

Group: Members
Posts: 15,063
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
The AAR typically fails open, though I have heard people say that theirs failed closed. The valve sits open most of the time (because we can only drive the car so many hours per day, right?). So when it freezes up, it tends to freeze open.

That could cause this sort of behavior.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rand
post Jul 28 2005, 12:52 AM
Post #5


Cross Member
*****

Group: Members
Posts: 7,409
Joined: 8-February 05
From: OR
Member No.: 3,573
Region Association: None
Ok, good to know. But in my particular case, the behavior didn't change if I plugged the hose after the AAR valve. So I know I'm not getting faster idle after warm because of the AAR valve staying open. Still searching...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jul 28 2005, 07:28 AM
Post #6


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
I vote this is the number one complaint, bad idle.

Usually the AAR is rusted stuck open, the idle is adjusted wrong and there are vacuum leaks. Its like chasing your tail!

Test the AAR to see if it opens and closes first. Then check the hoses to see if they are connected properly. Then test for vacuum leaks ie injector seals, hoses, TB gasket, worn out dizzy etc...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BahnBrenner914
post Jul 28 2005, 12:28 PM
Post #7


The girl is gone and all I have now is a beat-up teener
**

Group: Members
Posts: 301
Joined: 22-May 04
From: Gig Harbor and University Place, WA :: School in Angola, IN :: girlfriend in Sarasota, FL
Member No.: 2,094
Region Association: None
yeah, i started it up last night and it started running about 1500 to 2000 but after a minute and some revving, it calmed down to a 1100 idle. I also noticed that when i revved it, it went up quick and then came back down really slow. I've replaced all the vacuum hoses so i know they are all good... and where is this AAR valve?

(IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jul 28 2005, 02:20 PM
Post #8


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
see pic


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
smooth_eddy
post Jul 28 2005, 04:30 PM
Post #9


Senior Member
***

Group: Members
Posts: 535
Joined: 13-November 04
From: Seattle
Member No.: 3,102
The AAR is easy to remove and bench test with aligators and a battery charger. I had similar problems, 20 minute Geoff found incorrectly connected vac hoses and a bad AAR on my car. Eddy
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
redshift
post Jul 28 2005, 04:36 PM
Post #10


Bless the Hell out of you!
**********

Group: Members
Posts: 10,926
Joined: 29-June 03
Member No.: 869
QUOTE (Bleyseng @ Jul 28 2005, 04:20 PM)
see pic

Nice pic, Geoff! Where'd you get that one? I don't think I've see it before...

(IMG:http://www.914world.com/bbs2/html/emoticons/rolleyes.gif)


M
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jul 28 2005, 04:48 PM
Post #11


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
here is how Miles fixes his AAR valve...by doing the AAR Valve Dance!


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 28 2005, 05:52 PM
Post #12


914 Idiot
***************

Group: Members
Posts: 15,063
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Also check the Decel Valve. It could be sticking open.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
DNHunt
post Jul 28 2005, 06:31 PM
Post #13


914 Wizard? No way. I got too much to learn.
****

Group: Members
Posts: 4,099
Joined: 21-April 03
From: Gig Harbor, WA
Member No.: 598
Damn Miles that's one tall sheep.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fatlando
post Jul 28 2005, 07:49 PM
Post #14


Member
**

Group: Members
Posts: 259
Joined: 6-September 04
From: imperial beach, california
Member No.: 2,700
my car is doing the same up and down thing too. I have a fuel injected stock 75 2.0 engine. that photo that was pictured, can i use that as a refrence?

thanx

fat lando
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
BahnBrenner914
post Jul 28 2005, 09:06 PM
Post #15


The girl is gone and all I have now is a beat-up teener
**

Group: Members
Posts: 301
Joined: 22-May 04
From: Gig Harbor and University Place, WA :: School in Angola, IN :: girlfriend in Sarasota, FL
Member No.: 2,094
Region Association: None
QUOTE (Dave_Darling @ Jul 28 2005, 03:52 PM)
Also check the Decel Valve.

Where is that? i dont see it in the wonderfully labeled pic
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Rand
post Jul 28 2005, 10:44 PM
Post #16


Cross Member
*****

Group: Members
Posts: 7,409
Joined: 8-February 05
From: OR
Member No.: 3,573
Region Association: None
On my '75 2.0 it was right next to the MPS. Fastened by the same clamp in fact. Now it's gone.

Spilled Spot remover on my dog. Now he's gone.

I digress.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Jul 28 2005, 10:58 PM
Post #17


Aircooled Baby!
**********

Group: Members
Posts: 13,036
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
The MPS and decel valve are mounted under the battery tray. Chuck the decel valve and plug the hoses....


Use the 73 2.0l pic for hose layout as its a real Factory pic!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 29 2005, 10:30 AM
Post #18


914 Idiot
***************

Group: Members
Posts: 15,063
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
A real factory pic, with only a few things moved around and in the wrong place....

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
fatlando
post Jul 29 2005, 12:44 PM
Post #19


Member
**

Group: Members
Posts: 259
Joined: 6-September 04
From: imperial beach, california
Member No.: 2,700
QUOTE (Dave_Darling @ Jul 29 2005, 08:30 AM)
A real factory pic, with only a few things moved around and in the wrong place....

--DD

Dave,

Do you have the whereabouts of a "real" factory picture of all the vaccum hoses for a stock fuel injected 75 2.0?

i gotta fix my kerplunk this weekend.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 29 2005, 01:03 PM
Post #20


914 Idiot
***************

Group: Members
Posts: 15,063
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Nope!

I do, however, know where there are some line-drawings (which can occasionally show things clearer than photos) that have the 73-74 2.0 hose locations. The fuel hose routing is slightly different on the 75-76 cars, of course... You could use the 75 1.8 diagram for the fuel hose routing, I suppose.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
Reply to this topicStart new topic
3 User(s) are reading this topic (3 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 26th December 2024 - 09:22 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...