Quote:
Originally Posted by JB3
89 no scanner, should be obd1.
My 89 chevy the service light turned out to be the egr valve was plugged, but that was a 4.3 throttle body injection. You probably have a similar setup
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My 91 is OBD1 too. We can jump the terminal to get the code. With scanner you get more data for diagnosis though. He'd need to find the ALDL which is probably under the driver side dash.
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