codes

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is there a way to read engine codes on a 98 gmc safari van? I know that I can read the codes on my ford aerostar by turning off and on twice, then leaving the key on and watch the engine light blink, (like 3 blinks, then a pause, then the last number. then comes (I think) a 55 code meaning the end of the code) is there a way to do something like this on a 98 gmc safari. rear wheel drive with a 4.3 dual air till I can afford a OBIII code reader.