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Join Date: Mar 2009
Location: Lewes DE
Posts: 114
Garage
Happy Holidays and thanks for a great forum! (AAR issue solved)

When cold weather set in this month my cold idle was very high (1900-2000 rpm) and would not settle down for about 20 minutes to 950. (air temp 32) Fuel pressures all within spec. Looked for similar issues on forum and found that the AAR was probably the culprit. I had ground and power and a resistance reading of 28. I pulled it off anyway, drilled out the rivets, and cleaned it up. It really was not that dirty. I then found a post about "knocking the pin" I pressed the small pin in a little and verified that that the cold opening was about 20% narrower. Now I am getting 1400 rpm cold for about 3 minutes and it settles down to 950. Without the search feature and everyone posting I would not have figured this out!! Hopefully I will still have good idle behavior when it is 90 outside! Thanks again Pelican community. Oh, the car is an 83'sc ROW.
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1983 SC Targa, 1973 911
FFR Cobra
1941 Dodge Truck (restomod)
1955 Plymouth Wagon 2dr
1973 Porsche 914
Old 12-13-2018, 04:21 AM
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Join Date: May 2014
Location: SF Bay Area
Posts: 3,519
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Congrats on fixing the problem. I guess that the closing mechanism was stuck before given it took that long, 20 min to close. Knocking the pin freed it up.

Pics will be great !
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I can't afford that.
Old 12-13-2018, 12:02 PM
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Join Date: Mar 2009
Location: Lewes DE
Posts: 114
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Sorry no pics, was in a hurry when I did it. I don't think it was sticking. It looked like it was open to far based on a couple of pictures I have seen. The opening when cold was like a 3/4 moon. I have heard 1/4-1/3 moon shape is normal.
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1983 SC Targa, 1973 911
FFR Cobra
1941 Dodge Truck (restomod)
1955 Plymouth Wagon 2dr
1973 Porsche 914
Old 12-14-2018, 04:51 AM
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Join Date: Aug 2013
Location: Vermont
Posts: 184
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I have done the same knocking procedure with my 1983 euro, after confirming I had the correct AAR 226 part number. The issue of what is "normal behavior" seems to be a bit unclear. However, I believe the opening distance of 100% is normal. The resulting 1800 - 1900 rpm has been quoted in many threads as "normal and desirable", if not a bit annoyingly high at startup. The reduction to 950rpm time is tied to both outside temp and the resistance of the AAR, as stated by Tony below.

"I don't have the data for AAR-226. They are basically identical except for the heater resistance values. The 22 Ohms heater will close faster than a 33 Ohms AAR."

I have settled on preferring a higher starting rpm so have it set at 1800 (fully open cold). When it's 35 outside, it takes over 10 min to settle down to 950. The higher idle is a bit annoying but also seems to help offset an idle drop I periodically see in summertime warmth. I would be interested to see if you see any cold start mis-behavior when it gets warmer out.
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1983SC RoW
Old 12-14-2018, 06:11 AM
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