1991 Chevrolet C1500 Logo
Posted on Mar 25, 2010
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How do i read codes for my 91 chevy silverado? Its running rough...starts fine then a few seconds later sputs out unless i feather the pedal to keep it going. Can't drive it. check engine light came on once.

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Mike G

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  • Posted on Apr 11, 2010
Mike G
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Under the dash board there is an electrical block with nothing plugged into it. there are 2 rows of terminals. on the top row on the right is terminal "a". terminal "b" is the second one in from the right. terminal diagram labeling is like this from left to right.
top row,"F", "E", "blank","C","B","A"
bottom row "G","H", "blank","blank","blank","blank"
take a small piece of wire and jump terminal "A" and "B". i found an unfolded paper clip works well. with the terminals jumped, turn the key to the on position.(DO NOT START ENGINE) with the key on, the service engine light will start flashing codes. count the flashes. it will repeat each code 3 times before moving on to the next code. your first and last code will be a code 12. that is just the test code. it lets you know you did it right. you will see 1 flash with a short pause then 2 flashes. after you see that 3 times, your next code will be your trouble codes. when you see code "12" again, there are no more. if you tell me what the codes are, i'll tell you what the mean. hope this helps.

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  • Posted on Dec 19, 2014
carlos
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I get 3Flashes over and over it goes on and on

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