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rg-series · Joined: 25 Feb 2006 Posts: 17 Location: Tempe, Arizona USA

The idle on my 80 931 is up at about 1300 RPM right now, and I want to bring it down where it should be. How worried should I be about adjusting the idle speed back down ONLY if I have a CO meter hooked up?

Mike924 · Joined: 12 Aug 2004 Posts: 2601 Location: IoW UK

Not worried at all.

Over the range of engine speeds you're talking about (500 - 1500 rpm), changing the idle speed will have next to no effect on the CO content. Just do it.
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

Ozzie · Posted: Tue Feb 28, 2006 6:57 pm Post subject:

Be aware that its not as simple as adjusting the screw on the throttle body.
IIRC the 931 has DITC and EIS.
You may have to talk about it on the 931 forum.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Smoothie · Posted: Wed Mar 01, 2006 2:19 am Post subject:

Actually, the 931 got DITC ignition with built-in EIS starting in '81. Same for the 924na - it got TCI-H ignition with seperate EIS starting in '81 (maybe only US/Can cars though). -So, should be no EIS (electronic idle stabilization) or DITC on an '80.
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Ozzie · Posted: Wed Mar 01, 2006 6:15 am Post subject:

Thanks Smoothie.
_________________
Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance