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#1
10-29-2007, 10:13 PM
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Possible Idle Control Adjustment repair related
When I picked up my 82/83 euro 500 sec from the shop
I asked if they had noticed the ICV was an airslide not electroniic They said they had noticed. So I asked if it would be any problem & they said it would not be. I mentioned being concerned as the car in drive was spec 650 rpm but I thought the AC could lower the rpm with possible problems. My mechanic told me to turn something to increase idle if it was too low. I thought he meant the air slide valve but now I think it looks like it could be the yellow valve with a screwdriver indentation on top? I finally tried the Ac while driving & the 600 rpm drops to almost 500 I should call the mechanic but obviously he thought me capablr of doing it & I thought I knew what part he was referring to but now I;m not sure. Would turning the circled valved increase/decrease idle? I will have to check but since I got the car back the car is idling lower sometimes close to 500 esp w AC It used to idle fine in drive but after the new plugs, wires, thermal vacumn valve switch & acumulator & possible adjustment of this circled valve I;ll have to check its curreent position against the pics of the prior valve position & get it back to where it was. He seemed to know that the idle of a car w a airslide valve was supposed to be higher in park at startup & he didn't mention adjusting the idle down so not sure how the work done lowered the idle. Would I have to turn it counter clockwise to increaase rpm? It looks like it was more 10 oclock ish & now its like 11 ish? Thanks I'll probably take it back when I get a chance to get it straight but in meantime I would like to know what to do if I run into a probllem... Thanks
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~Shadow~  83 500 SEC Euro 198K Last edited by CamelotShadow; 10-29-2007 at 11:49 PM. 
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#2
10-30-2007, 01:04 AM
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I would not worry which way to turn the idle adjustment screw. Simply do it by ear. I've done it this way with my 110 engine and it works fine. Then just check your tach for verification. I'm a little purplexed though by your 82?83 500 sec not having a change-over valve. My old 77 280e even has one. Aside from retarding the ignition timing for decelaration, it also INCREASES the RPM when the AC compressor is turned on. I would have to guess that your car, much newer than mine, has the same change-over valve. You might want to check into this.
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#3
10-30-2007, 01:21 AM
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Change over valve
Interesting More things to look into...  Thats the screw to turn though? Don't want to mess anything up too much Next time I;m under the hood I'll check to see if soome one adjusted it by memory I clocked the current position & its seems to have been adjusted...I'll go back to the original direction.
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~Shadow~ 83 500 SEC Euro 198K
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#4
10-30-2007, 01:34 AM
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If it's on the throttle valve housing, it's the correct screw.
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#5
10-30-2007, 01:51 AM
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Not sure of that
Its right between the air slide idel control valve & cold start valve in front of the intake... I don't want to touch anything on the fuel distrib I don't think he'd tell me to touch that said something about yellow thats but I have the yellow dot on the aior slide valve & the yellow vlave circled is next to that
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~Shadow~ 83 500 SEC Euro 198K
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#6
10-30-2007, 07:00 PM
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Got it...
Has to be the plastic yellowed white screw....
 Quote:
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~Shadow~ 83 500 SEC Euro 198K
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