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Originally Posted by Mikado14
You mentioned "after it is warmed up". You may be going into closed loop operation. If you have a scanner or access to one that read the data stream you will need to see if this is so. If it is, check the response of the O2 sensor. If it has over 100K miles and has never been changed, it wouldn't hurt at all.
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WELL, THE OXEGEN SENSOR HAS BEEN REPLACED TWICE. FORGOT TO MENTION IT. I DO GET A CODE 45, THAT SAYS RICH MIXTURE, REPLACE OZYGEN SENSOR. I HAVE 2 TIMES TO NO AVAIL. I HAVE NO IDEA, BUT, HAVE BEEN TOLD, THERE IS NO SCANNER FOR THIS OLD PIECE. IT`S A `93. HAS SELF DIAGNOSTIC CAPABILITIES. I ONLY GET THE CODE 45. AFTER DISCONNECTING THE BATTERY , THIS CLEARS ITSELF, BUT, RETURNS NEXT TIME ENGINE IS STARTED.