 Quick AAR question |
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| Gradskater |
 Nov 11 2006, 10:55 PM
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#1
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Newbie  Group: Members Posts: 47 Joined: 14-April 05 From: Redlands, CA Member No.: 3,938 Region Association: None  |
Search didnt come up with my answer.
My AAR is acting up (not opening and closing reliably). If I disconnect it, I believe idle speed should stay constant. Right? I would need to plug the hole leading into the intake im guessing. Is there anything else that would change idle speed transiently like the AAR does? thanks for any help |
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| type47 |
Nov 12 2006, 06:17 AM
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#2
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
i think the AAR bumps up the idle for an engine that is cold. the AAR should then, eventually ~couple of minutes, close when the AAR has been warmed by either it's internal heater coil or ambient engine heat. my guess is the other engine sensors tell the brain about how much fuel to inject. idle speed controlled by screw on throttle body, idle mixture adjusted by click knob on top of the brain. (assuming D-jet)
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| Bleyseng |
Nov 12 2006, 10:05 AM
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#3
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
The AAR justs opens additional air to the cold engine to increase the idle. Squirt some PB Blaster into it to lube the rotary valve so it will unstick.
It should be closed after 5-10 minutes totally. |
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| Bruce Allert |
Nov 12 2006, 10:15 AM
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#4
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Hellions asleep Group: Members Posts: 3,289 Joined: 19-March 03 From: Eagle Creek, Orygun Member No.: 441 Region Association: Pacific Northwest |
QUOTE(Gradskater @ Nov 11 2006, 08:55 PM)  Is there anything else that would change idle speed transiently like the AAR does? Yup, any and all vacuum hoses that are not secure or hole-less. Vacuum system must be tight. Good luck finding leaks (IMG:style_emoticons/default/beer.gif) .....b |
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| jim_hoyland |
Nov 12 2006, 04:13 PM
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#5
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Get that VIN ? Group: Members Posts: 9,811 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California 
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The big question is whether the AAR works. Take it out of a cool engine and look through the hole. If it looks about 1/3 to 1/4 open, then hook up a + and - wire from your battery to the AAR's terminals. The hole should get closed off within 5 minutes. If it does't close, try the PB blast.
I timed mine at 1min 55sec to close. If it passes this test, you could have a vacuum leak from a hose. I recently added a vacuum gauge to one of the lines going to the plenum. If idle get's errratic due to a vacuum leak, the gauge will drop in pressure. Attached image(s) 
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| Gradskater |
Nov 12 2006, 10:06 PM
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#6
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Newbie Group: Members Posts: 47 Joined: 14-April 05 From: Redlands, CA Member No.: 3,938 Region Association: None |
thanks for the info.
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