| Author |
Message |
seanjenn
Samba Member
Joined: March 07, 2009
Posts: 722
Location: TAOS
|
 Posted: Tue Sep 27, 2011 8:36 am Post subject: AAR question....relay? |
 |
|
84 1.9L MT
First, did the brotherly thing and loaned my Bentley to a bro in NM. He left town for work leaving my book locked in his westy. A week later I left town cuz I only stay in NM during the boating season. Book's in the mail but I swear I almost removed a side window from his westy to get it back!
So, awhile back I was chasing my crapy, loping, sometimes surging, shit-tastic in town MPG, rich at idle problem. Yep I checked that, and that too, and that thing over there as well. I like to test things before replacing them, more and more of these parts are becoming NLA, so I like to know for sure. One of the things I looked into was the AAR. I tested for power to the plug=all good
Removed AAR from van and applied 12V to the terminals, looked inside the thing and watched it open up, removed 12V and watched it close=all good
The hoses were shot so I replaced them.
Yesterday while beating my head against the wall some more with this issue, reached down in there and pinched the hose going into the AAR.
Engine cold= NO change in idle, hmm, that ain't right
Engine @ op temp=No change in idle
Is there a relay that tells the AAR when to open?
After the engine is at opperating temp, the AAR is supposed to be wide open and would have no affect on the idle, correct?
Based on bench testing this thing, it works just fine. In the vehicle, apparently it does not.
Any thoughts?
_________________
1987 GL Sunroof
2.1 4 spd |
|
| Back to top |
|
 |
Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50338
|
| Posted: Tue Sep 27, 2011 8:53 am Post subject: |
|
|
| Assuming it is wired the same as earlier aircooled engines, the AAR is powered by the fuel pump relay and is grounded through the ECU. |
|
| Back to top |
|
|
kamzcab86
Samba Moderator
Joined: July 26, 2008
Posts: 7917
Location: Arizona
|
| Posted: Tue Sep 27, 2011 11:42 am Post subject: Re: AAR question....relay? |
|
|
| seanjenn wrote: |
After the engine is at opperating temp, the AAR is supposed to be wide open and would have no affect on the idle, correct? |
Opposite: At cold-start, the valve should be wide open; as the engine heats up, the valve should be shut tight. Valve open at operating temp = wide open vacuum/air leak.
_________________
~Kamz 
1986 Cabriolet: www.Cabby-Info.com
 1990 Vanagon Westfalia: Old Blue's Blog
2016 Golf GTI S
"Real knowledge is to know the extent of one's ignorance." - 孔子 |
|
| Back to top |
|
|
seanjenn
Samba Member
Joined: March 07, 2009
Posts: 722
Location: TAOS
|
| Posted: Tue Sep 27, 2011 12:53 pm Post subject: |
|
|
So the thing to do would be, go run some errands and get the van nice and warm. Then, while it's idling, all lumpy as usual, pinch off the hose going into the AAR. If the idle levels out, this tells me that the AAR is staying open, and is faulty. Correct?
_________________
1987 GL Sunroof
2.1 4 spd |
|
| Back to top |
|
|
Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50338
|
| Posted: Tue Sep 27, 2011 3:18 pm Post subject: |
|
|
| seanjenn wrote: |
| So the thing to do would be, go run some errands and get the van nice and warm. Then, while it's idling, all lumpy as usual, pinch off the hose going into the AAR. If the idle levels out, this tells me that the AAR is staying open, and is faulty. Correct? |
The AAR has nothing to do with mixture, just engine idle speed. If it is staying open it will cause a fast smooth idle. |
|
| Back to top |
|
|
seanjenn
Samba Member
Joined: March 07, 2009
Posts: 722
Location: TAOS
|
| Posted: Tue Sep 27, 2011 5:08 pm Post subject: |
|
|
yeah...not fast or smooth. back to the drawing board i guess. sumbitch 
_________________
1987 GL Sunroof
2.1 4 spd |
|
| Back to top |
|
|
Jake de Villiers
Samba Member
Joined: October 24, 2007
Posts: 5911
Location: Tsawwassen, BC
|
| Posted: Wed Sep 28, 2011 9:17 am Post subject: |
|
|
| seanjenn wrote: |
| yeah...not fast or smooth. back to the drawing board i guess. sumbitch |
Check your fuel pressure - the regulator has a diaphragm inside that can tear from old age.
_________________
'84 Vanagon GL 1.9 WBX
'86 Westy Weekender Poptop/2.5 Subaru/5 Speed Posi/Audi Front Brakes/16 x 7 Mercedes Wheels - answers to 'Dixie'
@jakedevilliersmusic1
http://sites.google.com/site/subyjake/mydixiedarlin%27
www.crescentbeachguitar.com
www.thebassspa.com |
|
| Back to top |
|
|
|
