christophercon Posted April 20, 2005 Report Share Posted April 20, 2005 1994 STS hard starting at all temperatures. At idle engine will surge from 600 to 1200 RPM. Most of the time the exhaust smell like its too rich and is black and some times exhaust is white but does not smell like oil. Had two codes- P031 MAP SENSOR SHORTED and P095 STALL DETECTED. Both codes were HISTORY not CURRENT. Cleared the codes and Changed the map sensor last night and the idle has stabilized a little and starting is a little easier. Still have black smoke and sometimes white aswell. Ran car for half an hour after map sensor change and no codes present. ANYONE HAVE ANY IDEAS?? THANKS IN ADVANCE FOR YOUR FEEDBACK. OH, one more question - when I took out the old map it did not have a vacuum hose connected to it. It just snapes down into place and gets the electronic 3 prong connector. IS THIS CORRECT?? IT GETS NO VACUUM HOSE?? Link to comment Share on other sites More sharing options...
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