 Electrical circuit for AAR, Where does it trace back to? |
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| boxsterfan |
 Nov 20 2013, 09:10 PM
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#1
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914's are kewl  Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California  |
So, I have been having what I thought was the problem of a stuck-open AAR.
1. Start car cold 2. Car idles at 1800 RPM during warm-up 3. Car gets warmed up and now starts idling at 3,000 RPM 4. Pull input to AAR and you can feel it is still sucking air in (a ton). 5. Plug the input to AAR and idle drops to 950 RPM. Today, I replaced the AAR (thanks fellow 914world member) with another one. However, the problem/symptom persists just as above. So now I suspect I am not getting power to the AAR so that its little bimetallic strip can be heated up. Where does the power wire for the AAR trace back to in the car (74 2.0L)? How can I test that wire? |
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| tumamilhem |
Nov 20 2013, 10:12 PM
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#2
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LUFTBRIGADE Group: Members Posts: 1,228 Joined: 29-October 12 From: Jacksonville, FL Member No.: 15,092 Region Association: South East States |
I am currently having this same problem. Hopefully once my AAR valve is fixed (or replaced if can't be fixed), my car will run properly. Also idling at 3000 rpm. When the car gets hot, it struggles to start, if at all due to AAR making the car run lean.
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| 914itis |
Nov 20 2013, 10:20 PM
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#3
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Advanced Member Group: Members Posts: 2,892 Joined: 9-October 10 From: New York City Member No.: 12,256 Region Association: North East States |
QUOTE(tumamilhem @ Nov 20 2013, 11:12 PM)  I am currently having this same problem. Hopefully once my AAR valve is fixed (or replaced if can't be fixed), my car will run properly. Also idling at 3000 rpm. When the car gets hot, it struggles to start, if at all due to AAR making the car run lean. I would start by checking timing on yours. Hard to start, not a bad AAR symptom. |
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| tumamilhem |
Nov 21 2013, 06:01 AM
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#4
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LUFTBRIGADE Group: Members Posts: 1,228 Joined: 29-October 12 From: Jacksonville, FL Member No.: 15,092 Region Association: South East States |
QUOTE(914itis @ Nov 20 2013, 11:20 PM) QUOTE(tumamilhem @ Nov 20 2013, 11:12 PM) I am currently having this same problem. Hopefully once my AAR valve is fixed (or replaced if can't be fixed), my car will run properly. Also idling at 3000 rpm. When the car gets hot, it struggles to start, if at all due to AAR making the car run lean. I would start by checking timing on yours. Hard to start, not a bad AAR symptom. Initially I thought it was the timing and had the timing adjusted. It was checked again last week and timing is fine. The not starting part was because the AAR was causing a vacuum leak, causing he engine to run very lean, which in turn made it difficult to start the car after it got hot. |
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| Dave_Darling |
Nov 21 2013, 10:19 AM
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#5
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914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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QUOTE(tumamilhem @ Nov 21 2013, 04:01 AM) The not starting part was because the AAR was causing a vacuum leak, causing he engine to run very lean, which in turn made it difficult to start the car after it got hot. The AAR does not affect the mixture. On L-jet systems, the air that it lets into the manifold is metered air--it has already been measured by the air flow meter. On D-jet systems, the MPS detects the extra air coming in and adds fuel to compensate. The mixture stays correct. In fact, most vacuum leaks on a D-jet system simply result in a higher idle, not in a mixture change. You have not found the cause for your hard starting; keep looking. --DD |
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Posts in this topic
boxsterfan Electrical circuit for AAR Nov 20 2013, 09:10 PM
SLITS White wire, engine harness, switched power. Power... Nov 20 2013, 09:22 PM
boxsterfan
White wire, engine harness, switched power. Powe... Nov 20 2013, 10:02 PM r_towle
White wire, engine harness, switched power. Pow... Nov 21 2013, 03:33 PM 914itis The AAR I sent you was tested.
I am positive it i... Nov 20 2013, 10:08 PM boxsterfan
The AAR I sent you was tested.
I am positive it ... Nov 20 2013, 10:11 PM 914itis
The AAR I sent you was tested.
I am positive it... Nov 20 2013, 10:18 PM boxsterfan
[quote name='boxsterfan' post='1960043' date='Nov... Nov 20 2013, 10:30 PM The Cabinetmaker
[quote name='tumamilhem' post='1960044' date='No... Nov 21 2013, 10:50 AM 914itis I got it like that. you can easily ad a spade conn... Nov 20 2013, 10:32 PM boxsterfan
I got it like that. you can easily ad a spade con... Nov 20 2013, 10:44 PM 914itis :chair: Nov 20 2013, 10:48 PM boxsterfan
:chair:
Certainly yes these would be used, but... Nov 21 2013, 10:37 AM SLITS On a 2.0L, the ground is through the mounting scre... Nov 21 2013, 07:20 AM boxsterfan Well, I was able to get my AAR working properly to... Nov 23 2013, 10:36 PM |
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