I've read through and searched most of the posts on the board and haven't found the answer to a problem I'm having, and thought it can't hurt to ask for help. I bought a '91 SC last fall, and immediately did a major tune-up (wires, plugs, all fluids/filters/etc., replaced leaking intake gaskets, vaccum hoses, and some other things I can't think of at the moment) after which the car ran simply perfectly for a stocker.
I've recently started having problems that seemed to start when the weather turned really cold (sub freezing to single digits)where-in the car will start right up with no problem, idle around 1200rpm for maybe five seconds, and then try to fall on its' face and die if I don't play with the throttle to keep it running. It runs fine once under way as long as you apply at least a little throttle, but will still idle very low (=<500rpm) or die at a stop unless you stay on the gas a little.
Once water temperature gets up to about 140-165 degrees (according to the mechanical gauge I'd installed), it idles fine and the problem disappears. Since the problem only happens when it's cold outside and the motors cold, I'm thinking it's probably the Air Charge Sensor, which according to the Haynes manual (suggestions for a good manual?) I have sends a signal to the EEC to correct/control fuel for cold start enrichment (I read as a choke equivalent).
Any input would be appreciated. Oh yeah, I'm not getting any check engine lights or 'yellow" arrows at any time for what it's worth. I'll probably check codes tomorrow at the shop, but thought it would be worth asking for input from the more knowledgeable board members in the mean time.
Thanks in advance.
I've recently started having problems that seemed to start when the weather turned really cold (sub freezing to single digits)where-in the car will start right up with no problem, idle around 1200rpm for maybe five seconds, and then try to fall on its' face and die if I don't play with the throttle to keep it running. It runs fine once under way as long as you apply at least a little throttle, but will still idle very low (=<500rpm) or die at a stop unless you stay on the gas a little.
Once water temperature gets up to about 140-165 degrees (according to the mechanical gauge I'd installed), it idles fine and the problem disappears. Since the problem only happens when it's cold outside and the motors cold, I'm thinking it's probably the Air Charge Sensor, which according to the Haynes manual (suggestions for a good manual?) I have sends a signal to the EEC to correct/control fuel for cold start enrichment (I read as a choke equivalent).
Any input would be appreciated. Oh yeah, I'm not getting any check engine lights or 'yellow" arrows at any time for what it's worth. I'll probably check codes tomorrow at the shop, but thought it would be worth asking for input from the more knowledgeable board members in the mean time.
Thanks in advance.