You know, it sounds like the temp. sender which tells the ecm what temp the engine is running at, might be giving bad readings. But, if you go to a posting by JTGH, at the bottom it says, "stuff to read", click on that, and look for CEL. Yes, you can get the codes on an 8 valve without a code reader. You have to short 2 pins on a plug which is located by the battery. but JTGH's information will tell you exactly how to do this. He has tons on information set up, you just have to take the time to look and read thru it.
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91 tracker 5 spd. 8V 1.6 L 4X4 hard top. 122,XXX miles.
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