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There is no underdash timer on a '92 YJ. The timer is built into the pcm. You will have to plug a scanner into your data link and turn to the page that says "reset EMR". EMR is early maintance reminder. While you are in there you should look at your long term adaptives. This will give you an idea of how much fuel correction is needed, and weather or not it is time to purge your injectors.
 
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