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Warm idle 140-160 1972

posted by  someone claiming to be Ira Eisenberg on  Fri Mar 23 15:54 CST 2001 [RELATED]

This car starts promptly and idles well both cold and warm. Idle speed warm is about 900RPM.....higher cold until the air slide closes. When I shut off the engine and its warm, if I restart within 15-20 minutes, the idle speed is immediately about 900RPM. If I wait longer, say 30 minutes to 1 hour, so the engine has cooled some but is not cold, the idle speed will be about 650-700RPM and may surge up and down for a couple of minutes before smoothing out at about 900RPM. Advance is set properly, there is a Crane XR 700 laser chopper instead of points and condensor, plugs are new. I did notice that the plugs have a little carbon residue suggesting rich mixture but my understanding is that surging is usually a result of a lean mixture. Any suggestions on what may be causing the low idle condition on starting when the engine is partially warm?





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